Under certain conditions, the refrigerant on the discharge side may exceed the designed operating pressure. To prevent system damage, the valve is designed to open automatically at approximately kPa psi.
Any condition that causes this valve to open should be corrected, and the refrigerant oil should be replaced as necessary. The air conditioning refrigerant pressure sensor should also be checked for proper calibration.
The refrigerant pressure status is sent to the PCM. Prevent compressor assembly operation if ambient temperatures are too cold. Disable the compressor assembly before high-side pressure becomes too high.
Diagnosis of compressor controls. Air Conditioning Evaporator Temperature Sensor Assembly The air conditioning evaporator temperature sensor assembly mounted to the heater and air conditioning evaporator module assembly has a probe inserted into the evaporator which measures evaporator temperature and sends a signal to the PCM. Within the probe is a thermistor which varies output according to temperature. The purpose of this sensor assembly is to inform the PCM of the evaporator temperature so the compressor assembly can be disabled before the evaporator freezes.
The evaporator temperature sensor assembly is a solid state device, do not attempt to measure resistance. Measuring resistance across pins can cause sensor damage. Many methods and special tools are available for this purpose; however, no matter which tool is used, care and diligence are the biggest keys to success.
The J is a small unit which operates on 12 volts DC and provides an audible signal which increases in frequency when leaking refrigerant is detected. There are three settings: one for R, one for Ra, and one for gross leaks.
The gross leak setting is for isolating very large leaks already found at one of the other two settings. Care must be taken that the instrument is properly calibrated, per the included instructions, and that it is used at the proper setting for the type of refrigerant in the system being tested.
Evaporator Core Because the evaporator core is contained in a closed module and is inaccessible to leak detectors, it. To leak-test the evaporator core: 1. Turn the blower motor assembly on to high for 15 or more seconds then shut it off. Wait 10 minutes. Remove blower motor resistor assembly. Insert the leak detector probe into the resistor opening. If the detector goes to a solid alarm, a leak has been found. Compressor and Block Fitting 1. Probe the compressor area.
Fluorescent Leak Detector Fluorescent detection additive is. These mixtures are potentially dangerous and may result In fire or explosion causing injury or property damage. Additional healtl1 and safety Information may be obtained from refrigerant and lubricant manufacturers.
To eliminate this condition, the following equipment and procedure should be used. Disinfectant can cause substantial, but temporary, eye injury.
Do not get in eyes or on clothing. Wash thoroughly with soap and water after handling disinfectant. If disinfectant gets into eyes, hold eyelids open and flush with a steady, gentle stream of water for fifteen minutes. Obtain medical attention if Irritation persists.
Remove heater core assembly. Check evaporator module assembly case for debris, remove any debris present. If debris is imbedded into evaporator core face and cannot be removed, the core will have to be removed from vehicle and cleaned. If a large amount of debris is present in evaporator module assembly case, the air inlet screen will require sealing around the windshield wiper post holes and fender edges.
Place drain pan with at least a two-liter two-quart capacity below evaporator drain hole to collect disinfectant and rinse water runoff. The evaporator drain hole is located at the bottom of the evaporator lower case approximately 25 mm 1 inch from the dasli panel assembly engine compartment side.
Connect battery charger to avoid draining battery assembly during cleaning procedure. Position pedestal fan and turn it on high speed to provide cross ventilation during cleaning procedure. Turn ignition switch to the "RUN" position but do not start vehicle. Seal and invert large container once or twice to mix contents. Use J or equivalent siphon-type parts-cleaning spray gun capable of delivering 60 ml 2 ounces per minute of liquid when driven with to kPa 80 to 90 psi of compressed air.
Insert nozzle of spray gun through heater core opening and insert siphon hose into container of disinfectant. Direct spray toward evaporator face taking extra care to ensure adequate coverage of the comers and edges, completely saturating the entire core. Use entire container of solution. Turn ignition switch to the "OFF" position and allow core to soak for five minutes.
Check underneath vehicle to verify proper drain operation. If necessary, unclog and increase drain plug hole with a rat-tail file. Tum the ignition switch to the "RUN" position but do not start vehicle. Thoroughly rinse evaporator core with one liter one quart of clean water using spray gun to remove any disinfectant residue.
Tum ignition switch to the "OFF" position and install heater core assembly. Dispose of disinfectant and rinse water runoff collected in drain pan in an approved manner. Replacing 0-Rlngs Install new GM-approved service replacement air conditioning 0-rings when a joint or a fitting is installed, except when the 0-rings are provided on new replacement components.
Unless service replacement 0-rings of the specified part numbers are used, excessive leakage of Refrigeranta may occur. Refer to the part number for identification, not to the former color-coating method of identification, because some formerly color-coated service replacement 0-rings may be black. Air conditioning 0-rings should be coated with mineral base viscosity refrigerant oil just before installation and should be slipped onto the flange tube to assure.
To prevent the possibility of swelling and a reduction in sealing effectiveness, 0-rings should not be allowed to soak in refrigerant oil. Before installation, the 0-rings and. Handling Refrigeranta The air conditioning system in this vehicle contains Refrigeranta Ra.
This chemical mixture requires special handling procedures to avoid personal injury. Always wear goggles and wrap a clean cloth around fittings, valves, and connections when performing work that involves opening the refrigerant system. Always work in a well ventilated area and avoid breathing any refrigerant fumes. Do not weld or steam clean on or near any vehicle-installed air conditioning lines or components. If Ra should come in contact with any part of the body, flush the exposed area with water and immediately seek medical attention.
Do not store or heat refrigerant containers above F 52C. Do not intentionally drop, puncture, or incinerate refrigerant col tainers. Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent suffocation. If it is necessary to carry a container of.. Dot CFR" Refrigeranta in a vehicle, it should not be carried in the passenger compartment.
Only containers that meet DOT. NOTICE: R refrigerant and Ra refrigerant must never be mixed, even in the smallest of amounts, as they are incompatible with each other. If the refrigerants are mixed, compressor failure is. Do not introduce compressed air to any refrigerant container or refrigerant component, because contamination will occur. Before attempting any service which requires opening refrigeration system lines or components, refer to "Handling of Refrigerant Lines and Fittings" and "Maintaining Chemical Stability" that follow.
Carefully follow the instructions for refrigerant recovery and recycling, adding oil, evacuating, and recharging the refrigeration system. All Refrigeranta disposable colored blue containers are shipped with a heavy metal screw cap to protect the valve and safety plug of the container from damage.
It is good practice to replace the cap after each use of the container to continue protection. Handling Refrigerant Lines and Fittings CAUTION: For personal protection, goggles should be worn and a clean clotll wrapped around fittings, valves and connections when doing work that includes opening the refrigeration system. If Refrigeranta comes in contact with any part of the body,. The exposed area should be flushed immediately with cold water and prompt medical help should be obtained.
All metal tubing lines should be free of dents or kinks to prevent loss of system capacity due to line restriction.
The flexible hose lines should never be bent to a radius of less than four times the diameter of the hose. The flexible hose lines should never to allowed to come within a distance of Flexible hose lines should be inspected regularly for leaks or brittleness and replaced with new lines if deterioration or leaking is found. When disconnecting any fitting in the refrigeration system, the system must first be discharged of all Refrigerant- l 34a.
Once a refrigerant line is opened to the atmosphere, it should be capped or taped immediately to prevent entry of moisture and dirt. The use of the proper wrenches when making connections on 0-ring fittings is important The opposing fitting should always be backed up with a wrench to prevent distortion of connecting lines or components.
Tighten all tubing connections to the specified torque for the fitting. Too little or too much torque when tightening can result in loose joints or deformed joint parts. Either condition can result in. Refer to "Fitting Tightening Specifications" at the end of this section. A burr or piece of dirt may cause a refrigerant leak. Install new 0-rings that have been lubricated with mineral base viscosity refrigerant oil. Do not use PAG oil.
Keep polyalkylene glycol PAG refrigerant oil off fitting threads. Long term contact. Flush threads of fittings with mineral base viscosity refrigerant oil. Do not wipe threads with a cloth. Maintaining Chemical Stability in the Refrigeration System The efficient operation and life of the air conditioning system is dependent upon the chemical stability of the refrigeration system. When foreign matepals such as dirt, air, or moisture, contaminate the refrigeration system, the stability of the Refrigeranta and polyalkylene glycol PAG synthetic refrigerant oil will change.
Contaminants will also affect pressure-temperature relationship, reduce efficient operation and possibly cause interior corrosion and abnormal wear of moving parts. Single pass filtering during recovery cycle, plus automatic multiple pass filtering during evacuation cycle assures constant supply. NOTICE: R and Ra require separate and non-interchangeable sets of recovery, recycling, and recharging equipment, because the refrigerants and lubricants. Do not attempt to use one set of equipment.
The following general practices should be observed to ensure the chemical stability in the system: A. Before breaking a refrigerant connection, wipe away any dirt or oil to reduce the possibility of dirt entering the system. Both sides of the connection should be capped, plugged or taped as soon as possible to prevent the entry of dirt, foreign material and moisture.
Keep tools clean and dry. This includes the manifold gage set and replacement parts. When adding polyalkylene glycol PAG synthetic refrigerant oil, the transfer device and container should be exceptionally clean and dry to assure that refrigerant oil remains as moisture-free as possible.
All service parts are dehydrated and sealed prior to shipping. They should remain sealed until just prior to making connections. All parts should be at room temperature before uncapping. This prevents condensation of moisture from the air entering the system. If for any reason caps are removed but the connections are not made, parts should be resealed as soon as possible.
If liquid refngerant comes into contact with the skin or eyes, injury may result. Use of other tanks could cause personal injury and void the warranty. Do not attempt to adapt this unit to Refrigerant systems as severe system failure will result.
Connect high-side red and low-side blue hoses to the ACR4 unit. Be sure to route hoses through hose reel bracket grommets. Control Panel Functions Figures 7 and 8 This section explains the functions of the various components of the unit control panel Figure 7. Main Power Switch - supplies electrical power to the control panel.
Beeper - emits an audible tone to alert the operator to unit operating functions. Digital Display - shows the time programmed for vacuum and the weight of refrigerant programmed for recharging. Moisture Indicator - shows if the refrigerant is wet ordty. In addition to the number keys, the control panel contains special keys that accomplish specific operating functions Figure 8.
ENTER - enters programmed data into the unit control memory. For information regarding the functions of the digital display, refer to the manufacturer instructions. Refillable Recovery Tank. The unit overfill limitation mechanism has been calibrated specifically for use with this tank, and the tank valving is set up specifically for use with the unit.
Connect battery charger to vehicle battery assembly to prevent battery assembly drain. This valve is located in the receiver dehydrator tube, between the receiver and dehydrator assembly and the condenser assembly.
Open the coupler valve after attachment. This valve is located in the compressor and condenser hose assembly, between the compressor assembly and the thermostatic expansion valve assembly. If there is no pressure, there is no refrigerant in the system to recover.
Air will be drawn into the recovery tank. Open both the high-side and the low-side valves on the control panel Figure 7. Slowly open the oil drain valve to see if the oil separator contains oil Figure 6. If any oil drains into the catch bottle at the bottom of the unit, allow it to drain until there is no more oil in the separator. Close the oil drain valve. Dispose of the oil in the catch bottle in an appropriate manner and return the bottle to its place on the unit. Blower motor assembly setting to "HIGH" will increase the rate at which refrigerant can be recovered.
Before recovery begins, the unit will clear itself of refrigerant. The cleaning process takes from thirty seconds to three minutes to complete Figure 9.
When cleaning is complete. Also, the weight of refrigerant being recovered will be displayed. The compressor shuts off automatically when initial recovery has occ11rred, at approximately 57 kPa 17 inches Hg vacuum.
The amount of oil removed often there will be none will vary greatly depending on a variety of conditions of the vehicle being serviced. The ACR4 separates the oil from the refrigerant. Slowly open the oil drain valve and drain the oil into the calibrated oil catch bottle at the bottom of the unit Figure 6. After the oil is completely drained, close the valve.
Repeat this step as needed until the system maintains vacuum for two minutes. If the display flashes "FULL" during the recovery process, and the unit shuts off, the unit tank is full.
An empty unit tank J must be installed to accommodate additional refrigerant, before proceeding to the next step in the recovery operation. Do not use any other kind of tank. It is possible to lower the amount of refrigerant in the unit tank by charging other vehicles. Once in the dia,nostic mode, press "7". When "7" is pressed, the ACR unit will display the amount of Rarefrigerant available in the tank. If less than 3. Refer to the manufacturer's instructions for adding refrigerant.
Read and record the amount of oil removed in the catch bottle. Dispose of the recovered oil in an appropriate manner. Never reuse this oil. This is a normal function. At approximately the A "O" vacuum reading indicates a major system leak. Repair leak and restart evacuation procedure. If a vacuum reading of kPa inches of Hg is indicated, close the low-side and high-side valves.
Observe the vacuum level for a few minutes as a leak check of the AJC system. When the vacuum sequence has run the programmed time, the display shows "CPL" to indicate that evacuation is complete. It is possible to evacuate longer. Press keys to enter time desired. New entry will show on the display.
The display counts down the vacuum time to zero to indicate operation time remaining. Automatic refrigerant recycling during each evacuation is a feature of the ACR4 system. No action is required by the technician. See the manufacturer instructions for this procedure. Non-condensable gases mostly air are automatically vented from the tank during the recycling process.
An audible sound of pres-. The vacuum pump oil must be changed frequently. When the pump has run for a total time of ten hours, the message "OIL" will flash on the control panel display as a reminder to change the oil. Refer to "Refrigerant Oil Distribution" that follows for proper oil capacities. Adjust the 0-ring around the PAG oil bottle to the required oil charge level.
Install the bottle on the oil injection system, on the back of the unit. Keep the oil bottles tightly capped at all times to keep out moisture and contamination. This will result in oil blow-back through the bottle vent. Open the valve at the top of the plastic container and watch the level of oil being drawn into the system. Close the valve when the required oil charge has been pulled into the system. Then replace the oil in the same amount as previously recorded from the old compressor assembly.
During component replacement and conditions stated, new oil quantities should be added to the system as follows: Compressor assembly replaced. Receiver and dehydrator assembly replaced. Evaporator replaced. Condenser assembly replaced. Refrigerant Loss Due to a Large Leak If the refrigerant charge is abruptly lost due to a large refrigerant leak, approximately 90 ml 3 fluid ounces of refrigerant oil will be carried out of the system suspended in the refrigerant.
Any failure that caused an abrupt refrigerant discharge will experience this oil loss. Failures 'that allow the refrigerant to seep or bleed off over time do not experience this oil loss. Upon replacement of a component which caused a large refrigerant leak, add 90 ml 3 fluid ounces of new polyalkylene glycol PAG synthetic refrigerant oil GM PIN or equivalent plus the required amount of oil for the particular component as outlined above. Add the oil directly to the replaced component if possible.
If the oil cannot easily be added to the replaced part, add the oil to the receiver dehydrator assembly. The normal blue tip. Compressor System Up to ml 4 fluid ounces of oil can collect in the crankcase. Therefore, It ts important when repladng a compressor assembly that the oil in the old compressor crankcase be drained and measured discard the oil after recording the amount.
All replacement compressor assemblies will be shipped with approximately ml 8 fluid ounces of oil in the crankcase. The oil must be drained and retained. Close the low-side valve on the control panel. Open the high-side valve on the control panel. Press "CHG" on the keypad to be sure the unit is in the program mode. Enter the amount of refrigerant charge to charge the AJC system by pressing the appropriate number keys.
Be sure to use correct unit of weight pounds or Kg. Do not overcharge. Press "CHG" on the keyboard to begin the charging process. The display counts down to zero as the charging process proceeds. At the end of the process, the display shows "CPL.
If the transfer of :refrigerant stops before complete, refer to "Unsuccessful Transfer" that follows. Successful Transfer Complete 1. Close the high-side valve on the unit control panel both valves should now be closed.
Continue with the previous procedure, "Successful Transfer Complete. Recover the refrigerant that has been charged into the system, refer to "Refrigerant Recovery" in this section. Add refrigerant to the tank following the manufacturer instructions, and refer to "Evacuation" in this section. Close the low-side coupler valve and disconnect from the vehicle.
There are two reasons why this can occur. In this case: A. Close the high-side valve Figure Open the low-side valve. This will. If Refrigeranta comes In contact with any part of the body, severe frostbite and personal injury can result. Either condition can result in refrigerant leakage and an inoperative air conditioning system.
Recover refrigerant. Strap 34 from compressor and condenser hose assembly 7. Compressor and condenser hose assembly fitting at thermostatic expansion valve assembly 6. Discard seal Compressor and condenser hose assembly fitting at condenser assembly 3. Coat 0-ring 17 with mineral base viscosity refrigerant oil. Compressor and condenser hose assembly fitting to condenser assembly 3. Compressor and condenser hose assembly fitting to 27 Nm 20 lb.
Seal 16 to compressor and condenser hose assembly fitting. Lightly coat seal 16 with mineral base viscosity refrigerant oil. Compressor and condenser hose assembly fitting to thermostatic expansion valve assembly 6. Compressor and condenser hose assembly fitting to 37 Nm 27 lb. Strap 34 to compressor and condenser hose assembly 7.
Leak-test fittings. Refer to "Leak-Testing the Refrigeration System" in this section. Use a back-up wrench to hold condenser assembly fitting while loosening compressor and condenser hose assembly fitting.
Discard 0-ring Compressor assembly. Your email address will not be published. This site uses Akismet to reduce spam. Learn how your comment data is processed. If you have any questions, please contact with us. Related Posts. Chevrolet Diagnostic Trouble Codes. Fault codes Chevrolet Aveo T and Leave a Reply Cancel reply Your email address will not be published.
Contact Contact Us. The trailering capacity of your specific vehicle may vary. The weight of passengers, cargo and options or accessories may reduce the amount you can trailer.
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The Camaro came as a highly attractive Coupe, sleek at the rear end, lower and slightly wider at the front end - giving it an ultra modern trim European look, which came at American low prices. It was given the nick name, the "Pony Car". Introduced in , the Camaro enjoyed considerable success, selling record number of cars year after year.
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