0000706469 00000 n
0000705739 00000 n
I pulled a vacuum on the system prior to charging. What is up with the high side? 
0000731438 00000 n
During this process, it absorbs heat and humidity from the cars cabin and provides with cool and dry air. The system is probably leaking. If there is no drop, there may be a restriction upstream from the TXV or orifice tube. The radiator fan near the condenser blows cool air onto the condenser and as a result, the high-pressure gas is converted into high pressure liquid, when it leaves the condenser. 0000733871 00000 n
ElectricalElectronicsEmbeddedPowerRoboticsARMIOT, Mini projectsMicrocontrollerArduinoSolarFree circuitsHome AutomationSeminar TopicsElectronicsQuestions, CapacitorsResistorsFiltersDiodesTransistorsAmplifiersIO DevicesThyristorsDC CircuitsNumber System, The 5 Best Refrigerant Recovery Machines Reviews and Buying, Manometer Vs Pressure Gauge - Key Difference. Question: The A/C compressor has seized on my 2000 Sienna.
0000418191 00000 n Answer: Not enough information. 0000005407 00000 n 0000706968 00000 n 0000674283 00000 n If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. 0000710887 00000 n Your email address will not be published. Since it does cool I would think it is close to being charged. 0000128463 00000 n <]/Prev 894632>> It had this problem prior to replacing these parts.
Considerable temperature difference between the inlet and outlet sides of the receiver dryer during operation.
Charge to the correct refrigerant levels. 180 0 obj <>stream
0000877042 00000 n
36 0 obj
<>stream
High side reading is normal but low side immediately pegged the gauge and didnt move. 3.Voltage drops in + or - side of the AC circuit, bad connections or corrosion (in the bottom of fuse panel) causing voltage drops. 0000719345 00000 n
Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). 0000872493 00000 n
0000710334 00000 n
Explains how to recharge a system, how to recover refrigerant, and how to replace AC components. Clutch plate air gap between the plate and the pulley in specs. Voltage at the compressor, should be 12V.
0000707519 00000 n Since there is no way to know exactly how much refrigerant is in the system, without removing it and measuring it, we will measure the pressure at the different sides of the system and compare the pressures to a pressure-temperature chart. 0000005332 00000 n
0000253900 00000 n
0000730428 00000 n
0000719431 00000 n 0000730355 00000 n I'm thinking a bad compressor could this be right or something else? 0000865335 00000 n When the temperature is set in between, part of the air will pass through the heater core. 0000675835 00000 n 0000730825 00000 n This may cause the AC or heater output to be reduced. endstream endobj 7 0 obj <> endobj 8 0 obj <> endobj 9 0 obj <>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageC]/ExtGState<>>> endobj 10 0 obj <> endobj 11 0 obj [/ICCBased 13 0 R] endobj 12 0 obj <>stream
The temperature and pressure of the refrigerant have a direct relationship. Which model, year, and options are you looking for? It works but, the next day doesnt work. A dirty evaporator. Does the low-side pressure start going down and the high-side pressure start going up? The system should cool down to 40 degrees.
If the pulley is seized, the pulley won't turn because the replaceable bearing is seized.
trailer 0000427395 00000 n 0000247313 00000 n If it looks foamy or has bubbles the system is undercharged or contaminated with air. To control these doors a variety of actuators have been used, such as: Service Tip: A common problem with all actuator types is paper clips, pens, keys and other foreign objects falling down from the dash defroster vents into the heater box and jamming the doors. Could the compressor clutch be partially sticking? Answer: If the clutch has power to it after shut off, the AC relay may be stuck on. Also, the refrigerant releases heat here which it absorbed at the evaporator. ?{#C=w,!q|?{|5(-V7 WSM7/&/zy?6Y-3C]x7w7%:Nd9R QPN_mVP16K3q`rcC|@Z5*B@2Lph9L ! {`8l;m:@\bz; 0000730880 00000 n Here's a look at the Cheetah, Chaparral, Shelby Cobra, Corvette Stingray, Shelby Mustang, Cobra Daytona, Devin SS, Griffith, Scarab, Sunbeam Tiger, Early Thunderbird, Arnolt-Bristol, Bocar, Dual-Ghia, Edwards America, Cunningham. What should be my next step? Answer: If the compressor seized, the pulley should still turn. Is the center hub turning? Pressure RangeLow side: 36 to 43 psiHigh side: 327+ psiIndicationsBoth pressures are TOO HIGHCausesPressure increase due to excessive refrigerantInsufficient condenser coolingRemedyVerify the refrigerant levelClean the condenserCheck and adjust the fan belt and / or the condenser fan motors, Pressure RangeLow side: 18 to 28 psiHigh side: 85 to 256 psiIndicationsLow pressure side alternates between a vacuum and normal pressureCausesMoisture has frozen in the air conditioner system, clogging the expansion valve.RemedyEvacuate the systemReplace the receiver dryerRecharge the system, Pressure RangeLow side: 0 to -29.99 psiHigh side: 71 to 85 psiIndicationsLow pressure side becomes a vacuumHigh pressure as listed aboveFrost or condensation on the front and rear pipe connections of the receiver dryer or expansion valveCausesAC system is blocked by contamination or iceAC system is shut off by defective expansion valve or tempeerature sensorAC line from evaporator to compressor has kink in the lineRemedySTOP OPERATION IMMEDIATELYCheck for contamination or iceIf moisture is found then evacuate the systemIf the expansion valve is defective then replace itReplace receiver dryerRecharge with refrigerant to proper levelRepair any kinked hoses.
0000710834 00000 n A special fluid called Refrigerant is used in refrigerators and air conditioners that helps in transfer of heat by continuously cycling between high high-pressure liquid state and a low-pressure gas state. 0000674355 00000 n 0000675227 00000 n Is the cooling fan running constantly?
When the proper pressure is reached, the vents blow warm air and the compressor drops out. 2006 dodge Durango slt 4.7l with front and rear ac. Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. 0000732821 00000 n The low-pressure liquid then flows to the evaporator and the refrigerant starts to boil and converts to low pressure gas. Answer: I assume it is an R12 system that has been converted to R134a. 2017 Perrin Manufacturing. Without knowing static pressure this is a guess. If the center hub is turning, the compressor is not pumping. 0000261102 00000 n No ads or spams, we promise. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Get great content that you love. 0000001786 00000 n If the pressure is zero, that means the system is at atmospheric pressure and has a big leak. "Do you need a motorcycle license?" I evacuated the system to get ready to add 134a. But due to its damaging effect on ozone, it has been banned in phases starting from 1994. 0000726509 00000 n Question: 2020 mustang air works when it wants to. 0000730996 00000 n Car dents are unsightly things, and even a couple of small ones really depreciate the value of your car. Repair any leaks and recharge the refrigerant to the correct levels. When I switch it off it still blows semi cool air. h1HQwLJ!@ Answer: 2020 Mustang should be R1234yf refrigerant. 0000863614 00000 n 0000749325 00000 n 0000730071 00000 n Pressure RangeLow side: 36 to 50 psiHigh side: 284 to 356 psiIndicationsBoth pressures are TOO HIGHThe low-side piping is not coldCausesAir in the systemRemedyEvacuate the systemReplenish the refrigerantCheck the gauge readingsIf prolonged operation with air in the system, the liquid tank must be replaced. 0000881280 00000 n 0000707207 00000 n This is the reason you can't add refrigerant. 0000673244 00000 n So, it is clear that temperature and pressure play an important role in the condensation and expansion of R134a. Question: I have a 1998 suburban with rear a/c. What happens behind the scenes will shock you. hwTTwz0z.0. 0000004250 00000 n
The table below shows 7 Gauge Readouts that you may encounter. Double-check to see if the compressor clutch is engaged.
Question: I have a 2008 Rav4. 0000077254 00000 n As with a plugged cabin filter, the occupants will complain of a lack of cooling even when there is nothing wrong with the AC system itself.
If not, the compressor may be worn out. The rear ac uses a TXV/H-Block and it sounds like the valve is not working.
The orifice tube has too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing. If the sight glass is clear liquid the system is fully charged.
What could be the problem?
2022 The Arena Media Brands, LLC and respective content providers on this website. This year's facelift of Mercedes-C-class Benz's sports sedan marks a major shift in design and engineering, but the car retains its winning combination of luxury and status at an accessible cost. Question: I charged the A/C system. Perform a visual check to see if the compressor is running. Typically used on small engines. When you shut off the AC you hear a hissing noise. Have a question?Need more information?Get in touch with our team fast. No hot water valve is needed because in cool mode the door closes off airflow through the heater core. If you feel that your cars AC is not cooling properly, then it is high time for your take your car to an AC technician. 0000317554 00000 n 0000729074 00000 n Does the pressure go up? 2. My mechanic says any bypass belt still will use the pulley or pass through the area of the compressor pulley. 3R `j[~ : w! The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. Refrigerators and Air Conditioners are the perfect examples of this system. 0000730501 00000 n The unwanted heat is mechanically transferred to an external area where the heat is unobjectionable. Service |Quality|About Us|Contact Us|Perrin Careers. A personal guide to the challenge of turning your dreamowning a Porsche 997into a reality.
0000729714 00000 n The process of removing heat from an area or location is called as Refrigeration. 0 startxref 0000725975 00000 n 0000733484 00000 n A hot water valve closes the flow of hot coolant through the heater core during the AC operation. Charge with DYE and retest with a black light. Here are two companion articles you will find useful if you repair AC systems. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. ). Possible Blockage in Expansion Valve or Orifice Tube.
0000676149 00000 n 0000672745 00000 n You'd be surprised what you find out. 0000867074 00000 n 0000336658 00000 n 0000729147 00000 n 0000675394 00000 n 0000503761 00000 n Service or Replacement. Record the pressures. The car is a 2006 Hyundai Accent.
0000709343 00000 n 0000708239 00000 n 0000673728 00000 n Answer: Never seen this before. Little temperature difference between the low and high pressures. We faithfully comply with all of the requirements of our ISO 9001:2015 Quality Management System, the most current edition of the standard. Both gauges are reading zero. It is important for the refrigerant to have certain properties such as: There are many other properties that a refrigerant must have (there are some requirements even at the molecular level). 0000426946 00000 n In the video, you will learn what a damaged wheel bearing sounds like and how to determine which wheel bearing is causing the noise. 0000728639 00000 n 0000864901 00000 n With such complex system, the maintenance also becomes critical and one important factor to keep track off is the pressure of the refrigerant. Pressure RangeLow side: 30 to 36 psiHigh side: 313 to 327 psiIndicationsBoth pressures are TOO HIGHCausesImproper refrigerant chargeDefective expansion valveImproper temperature sensor installationRemedyVerify refrigerant chargeCheck temperature sensor installation and insulationIf the refrigerant charge is okay and the temperature sensor installation and insulation are correct then replace the expansion valve. Based on the pressure of the refrigerant at any particular point in the loop, the whole system can be divided into High-Pressure Side and Low-Pressure Side. Expansion valve outlet side is chilled and low pressure side is LOW.
This filter is often overlooked until it is entirely plugged up and allows very little airflow into the cab. 0000055043 00000 n 0000674116 00000 n endstream endobj 13 0 obj <>stream 0000864540 00000 n Question: How do you tell if the condenser is restricted ? Does the pressure match the temperature-pressure chart? Electronic actuators with position sensors are very popular to move the doors to direct the airflow and control temperature.
In the defrost mode, the air will be dehydrated by the evaporator then heated by the heater core for hot dry air on the windshield. Compressor fitting is cool but the low pressure hose is not. Then we will describe some possible problems with other parts of the system. 0000708676 00000 n Typically an access panel either clips in or is bolted in to cover the replaceable filter.
It cools to about 45 in the front and 60 in the rear. 0000373724 00000 n 0000676346 00000 n The AC and heater operate out of the same box or plenum typically under the dash. 0000004358 00000 n 0000708623 00000 n 0000706416 00000 n Answer: Usually, the problem is reversed. $E}kyhyRm333: }=#ve 0000710448 00000 n Michael Thomas, automotive and diesel technician, is the author of the McGraw-Hill textbook "Truck and Trailer Systems.". Based on these and several other properties, some of the popular and industry approved refrigerants are: Earlier, the R-12 (also sold under the brand name Freon-12) was used as the main refrigerant in automobiles and household refrigeration. This high-pressure gas is then transferred to the condenser. Your car is a huge investment. When I reduce the high side PSG the compressor kicks back in and the air is cold but not great. 0000754388 00000 n 0000706102 00000 n Required fields are marked *. There is little temperature difference between the low and high pressure sides. 0000094436 00000 n The airflow goes through the evaporator and a door directs the air either through the heater core or around the heater core directed by the HOT to COLD selector. 0000705411 00000 n Qf Ml@DEHb!(`HPb0dFJ|yygs{. Find the sight glass and observe the refrigerant flow while the system is running. 0000001821 00000 n If the cabin filter is dirty, the result will be low airflow. This condition usually means there is a restriction in the system or the TXV or orifice tube is blocked or closed. Use the leak tester for larger leaks and the dye with a black light for smaller leaks. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. 0000729525 00000 n B26 !_:N(1![rF9\ZshJG9T\qC6e%Kk??
Question: Why does the ac cut off every time I make a turn? If this valve doesnt close, the AC cold air will be heated by the heater core. Answer: This means your low side pressure is above 150psi. The pressure of the refrigerant directly correlates with the temperature. Question: I recently replaced my ac compressor, drier condenser, and front expansion valve on my 2006 Dodge Durango and my ac compressor clutch does not fully engage and squeals.
0000731438 00000 n
During this process, it absorbs heat and humidity from the cars cabin and provides with cool and dry air. The system is probably leaking. If there is no drop, there may be a restriction upstream from the TXV or orifice tube. The radiator fan near the condenser blows cool air onto the condenser and as a result, the high-pressure gas is converted into high pressure liquid, when it leaves the condenser. 0000733871 00000 n
ElectricalElectronicsEmbeddedPowerRoboticsARMIOT, Mini projectsMicrocontrollerArduinoSolarFree circuitsHome AutomationSeminar TopicsElectronicsQuestions, CapacitorsResistorsFiltersDiodesTransistorsAmplifiersIO DevicesThyristorsDC CircuitsNumber System, The 5 Best Refrigerant Recovery Machines Reviews and Buying, Manometer Vs Pressure Gauge - Key Difference. Question: The A/C compressor has seized on my 2000 Sienna. 0000418191 00000 n Answer: Not enough information. 0000005407 00000 n 0000706968 00000 n 0000674283 00000 n If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. 0000710887 00000 n Your email address will not be published. Since it does cool I would think it is close to being charged. 0000128463 00000 n <]/Prev 894632>> It had this problem prior to replacing these parts.
Considerable temperature difference between the inlet and outlet sides of the receiver dryer during operation.
Charge to the correct refrigerant levels. 180 0 obj <>stream
0000877042 00000 n
36 0 obj
<>stream
High side reading is normal but low side immediately pegged the gauge and didnt move. 3.Voltage drops in + or - side of the AC circuit, bad connections or corrosion (in the bottom of fuse panel) causing voltage drops. 0000719345 00000 n
Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). 0000872493 00000 n
0000710334 00000 n
Explains how to recharge a system, how to recover refrigerant, and how to replace AC components. Clutch plate air gap between the plate and the pulley in specs. Voltage at the compressor, should be 12V. 0000707519 00000 n Since there is no way to know exactly how much refrigerant is in the system, without removing it and measuring it, we will measure the pressure at the different sides of the system and compare the pressures to a pressure-temperature chart. 0000005332 00000 n
0000253900 00000 n
0000730428 00000 n
0000719431 00000 n 0000730355 00000 n I'm thinking a bad compressor could this be right or something else? 0000865335 00000 n When the temperature is set in between, part of the air will pass through the heater core. 0000675835 00000 n 0000730825 00000 n This may cause the AC or heater output to be reduced. endstream endobj 7 0 obj <> endobj 8 0 obj <> endobj 9 0 obj <>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageC]/ExtGState<>>> endobj 10 0 obj <> endobj 11 0 obj [/ICCBased 13 0 R] endobj 12 0 obj <>stream
The temperature and pressure of the refrigerant have a direct relationship. Which model, year, and options are you looking for? It works but, the next day doesnt work. A dirty evaporator. Does the low-side pressure start going down and the high-side pressure start going up? The system should cool down to 40 degrees.
If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. trailer 0000427395 00000 n 0000247313 00000 n If it looks foamy or has bubbles the system is undercharged or contaminated with air. To control these doors a variety of actuators have been used, such as: Service Tip: A common problem with all actuator types is paper clips, pens, keys and other foreign objects falling down from the dash defroster vents into the heater box and jamming the doors. Could the compressor clutch be partially sticking? Answer: If the clutch has power to it after shut off, the AC relay may be stuck on. Also, the refrigerant releases heat here which it absorbed at the evaporator. ?{#C=w,!q|?{|5(-V7 WSM7/&/zy?6Y-3C]x7w7%:Nd9R QPN_mVP16K3q`rcC|@Z5*B@2Lph9L ! {`8l;m:@\bz; 0000730880 00000 n Here's a look at the Cheetah, Chaparral, Shelby Cobra, Corvette Stingray, Shelby Mustang, Cobra Daytona, Devin SS, Griffith, Scarab, Sunbeam Tiger, Early Thunderbird, Arnolt-Bristol, Bocar, Dual-Ghia, Edwards America, Cunningham. What should be my next step? Answer: If the compressor seized, the pulley should still turn. Is the center hub turning? Pressure RangeLow side: 36 to 43 psiHigh side: 327+ psiIndicationsBoth pressures are TOO HIGHCausesPressure increase due to excessive refrigerantInsufficient condenser coolingRemedyVerify the refrigerant levelClean the condenserCheck and adjust the fan belt and / or the condenser fan motors, Pressure RangeLow side: 18 to 28 psiHigh side: 85 to 256 psiIndicationsLow pressure side alternates between a vacuum and normal pressureCausesMoisture has frozen in the air conditioner system, clogging the expansion valve.RemedyEvacuate the systemReplace the receiver dryerRecharge the system, Pressure RangeLow side: 0 to -29.99 psiHigh side: 71 to 85 psiIndicationsLow pressure side becomes a vacuumHigh pressure as listed aboveFrost or condensation on the front and rear pipe connections of the receiver dryer or expansion valveCausesAC system is blocked by contamination or iceAC system is shut off by defective expansion valve or tempeerature sensorAC line from evaporator to compressor has kink in the lineRemedySTOP OPERATION IMMEDIATELYCheck for contamination or iceIf moisture is found then evacuate the systemIf the expansion valve is defective then replace itReplace receiver dryerRecharge with refrigerant to proper levelRepair any kinked hoses.
0000710834 00000 n A special fluid called Refrigerant is used in refrigerators and air conditioners that helps in transfer of heat by continuously cycling between high high-pressure liquid state and a low-pressure gas state. 0000674355 00000 n 0000675227 00000 n Is the cooling fan running constantly?
When the proper pressure is reached, the vents blow warm air and the compressor drops out. 2006 dodge Durango slt 4.7l with front and rear ac. Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. 0000732821 00000 n The low-pressure liquid then flows to the evaporator and the refrigerant starts to boil and converts to low pressure gas. Answer: I assume it is an R12 system that has been converted to R134a. 2017 Perrin Manufacturing. Without knowing static pressure this is a guess. If the center hub is turning, the compressor is not pumping. 0000261102 00000 n No ads or spams, we promise. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Get great content that you love. 0000001786 00000 n If the pressure is zero, that means the system is at atmospheric pressure and has a big leak. "Do you need a motorcycle license?" I evacuated the system to get ready to add 134a. But due to its damaging effect on ozone, it has been banned in phases starting from 1994. 0000726509 00000 n Question: 2020 mustang air works when it wants to. 0000730996 00000 n Car dents are unsightly things, and even a couple of small ones really depreciate the value of your car. Repair any leaks and recharge the refrigerant to the correct levels. When I switch it off it still blows semi cool air. h1HQwLJ!@ Answer: 2020 Mustang should be R1234yf refrigerant. 0000863614 00000 n 0000749325 00000 n 0000730071 00000 n Pressure RangeLow side: 36 to 50 psiHigh side: 284 to 356 psiIndicationsBoth pressures are TOO HIGHThe low-side piping is not coldCausesAir in the systemRemedyEvacuate the systemReplenish the refrigerantCheck the gauge readingsIf prolonged operation with air in the system, the liquid tank must be replaced. 0000881280 00000 n 0000707207 00000 n This is the reason you can't add refrigerant. 0000673244 00000 n So, it is clear that temperature and pressure play an important role in the condensation and expansion of R134a. Question: I have a 1998 suburban with rear a/c. What happens behind the scenes will shock you. hwTTwz0z.0. 0000004250 00000 n
The table below shows 7 Gauge Readouts that you may encounter. Double-check to see if the compressor clutch is engaged.
Question: I have a 2008 Rav4. 0000077254 00000 n As with a plugged cabin filter, the occupants will complain of a lack of cooling even when there is nothing wrong with the AC system itself.
If not, the compressor may be worn out. The rear ac uses a TXV/H-Block and it sounds like the valve is not working.
The orifice tube has too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing. If the sight glass is clear liquid the system is fully charged.
What could be the problem?
2022 The Arena Media Brands, LLC and respective content providers on this website. This year's facelift of Mercedes-C-class Benz's sports sedan marks a major shift in design and engineering, but the car retains its winning combination of luxury and status at an accessible cost. Question: I charged the A/C system. Perform a visual check to see if the compressor is running. Typically used on small engines. When you shut off the AC you hear a hissing noise. Have a question?Need more information?Get in touch with our team fast. No hot water valve is needed because in cool mode the door closes off airflow through the heater core. If you feel that your cars AC is not cooling properly, then it is high time for your take your car to an AC technician. 0000317554 00000 n 0000729074 00000 n Does the pressure go up? 2. My mechanic says any bypass belt still will use the pulley or pass through the area of the compressor pulley. 3R `j[~ : w! The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. Refrigerators and Air Conditioners are the perfect examples of this system. 0000730501 00000 n The unwanted heat is mechanically transferred to an external area where the heat is unobjectionable. Service |Quality|About Us|Contact Us|Perrin Careers. A personal guide to the challenge of turning your dreamowning a Porsche 997into a reality.
0000729714 00000 n The process of removing heat from an area or location is called as Refrigeration. 0 startxref 0000725975 00000 n 0000733484 00000 n A hot water valve closes the flow of hot coolant through the heater core during the AC operation. Charge with DYE and retest with a black light. Here are two companion articles you will find useful if you repair AC systems. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. ). Possible Blockage in Expansion Valve or Orifice Tube.
0000676149 00000 n 0000672745 00000 n You'd be surprised what you find out. 0000867074 00000 n 0000336658 00000 n 0000729147 00000 n 0000675394 00000 n 0000503761 00000 n Service or Replacement. Record the pressures. The car is a 2006 Hyundai Accent.
0000709343 00000 n 0000708239 00000 n 0000673728 00000 n Answer: Never seen this before. Little temperature difference between the low and high pressures. We faithfully comply with all of the requirements of our ISO 9001:2015 Quality Management System, the most current edition of the standard. Both gauges are reading zero. It is important for the refrigerant to have certain properties such as: There are many other properties that a refrigerant must have (there are some requirements even at the molecular level). 0000426946 00000 n In the video, you will learn what a damaged wheel bearing sounds like and how to determine which wheel bearing is causing the noise. 0000728639 00000 n 0000864901 00000 n With such complex system, the maintenance also becomes critical and one important factor to keep track off is the pressure of the refrigerant. Pressure RangeLow side: 30 to 36 psiHigh side: 313 to 327 psiIndicationsBoth pressures are TOO HIGHCausesImproper refrigerant chargeDefective expansion valveImproper temperature sensor installationRemedyVerify refrigerant chargeCheck temperature sensor installation and insulationIf the refrigerant charge is okay and the temperature sensor installation and insulation are correct then replace the expansion valve. Based on the pressure of the refrigerant at any particular point in the loop, the whole system can be divided into High-Pressure Side and Low-Pressure Side. Expansion valve outlet side is chilled and low pressure side is LOW.
This filter is often overlooked until it is entirely plugged up and allows very little airflow into the cab. 0000055043 00000 n 0000674116 00000 n endstream endobj 13 0 obj <>stream 0000864540 00000 n Question: How do you tell if the condenser is restricted ? Does the pressure match the temperature-pressure chart? Electronic actuators with position sensors are very popular to move the doors to direct the airflow and control temperature.
In the defrost mode, the air will be dehydrated by the evaporator then heated by the heater core for hot dry air on the windshield. Compressor fitting is cool but the low pressure hose is not. Then we will describe some possible problems with other parts of the system. 0000708676 00000 n Typically an access panel either clips in or is bolted in to cover the replaceable filter.
It cools to about 45 in the front and 60 in the rear. 0000373724 00000 n 0000676346 00000 n The AC and heater operate out of the same box or plenum typically under the dash. 0000004358 00000 n 0000708623 00000 n 0000706416 00000 n Answer: Usually, the problem is reversed. $E}kyhyRm333: }=#ve 0000710448 00000 n Michael Thomas, automotive and diesel technician, is the author of the McGraw-Hill textbook "Truck and Trailer Systems.". Based on these and several other properties, some of the popular and industry approved refrigerants are: Earlier, the R-12 (also sold under the brand name Freon-12) was used as the main refrigerant in automobiles and household refrigeration. This high-pressure gas is then transferred to the condenser. Your car is a huge investment. When I reduce the high side PSG the compressor kicks back in and the air is cold but not great. 0000754388 00000 n 0000706102 00000 n Required fields are marked *. There is little temperature difference between the low and high pressure sides. 0000094436 00000 n The airflow goes through the evaporator and a door directs the air either through the heater core or around the heater core directed by the HOT to COLD selector. 0000705411 00000 n Qf Ml@DEHb!(`HPb0dFJ|yygs{. Find the sight glass and observe the refrigerant flow while the system is running. 0000001821 00000 n If the cabin filter is dirty, the result will be low airflow. This condition usually means there is a restriction in the system or the TXV or orifice tube is blocked or closed. Use the leak tester for larger leaks and the dye with a black light for smaller leaks. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. 0000729525 00000 n B26 !_:N(1![rF9\ZshJG9T\qC6e%Kk??
Question: Why does the ac cut off every time I make a turn? If this valve doesnt close, the AC cold air will be heated by the heater core. Answer: This means your low side pressure is above 150psi. The pressure of the refrigerant directly correlates with the temperature. Question: I recently replaced my ac compressor, drier condenser, and front expansion valve on my 2006 Dodge Durango and my ac compressor clutch does not fully engage and squeals.