Fluorescent Leak Detector
Fluorescent dye will assist in locating any leaks in the A/C system.
- Condensation on the evaporator core or the refrigerant lines may wash the PAG oil and fluorescent dye away from the actual leak. Condensation may also carry dye through the HVAC module drain.
- Leaks in the A/C system will be indicated in a light green or yellow color when using the leak detection lamp. Use the leak detection lamp in the following areas: All fittings or connections that use seal washers or O-rings All of the A/C components The A/C compressor shaft seal The A/C hoses and pressure switches The HVAC module drain tube, if the evaporator core is suspected of leaking The service port sealing caps The sealing cap is the primary seal for the service ports.
- Follow the instructions supplied with the J 42220 . See «Special Tools»(ref-197627-S36369102382005101200000) .
- To prevent false diagnosis in the future, thoroughly clean the residual dye from any area where leaks were found. Use a rag and the approved J 43872 . See «Special Tools»(ref-197627-S36369102382005101200000) .
Fluorescent Dye Injection
- Not all of the fluorescent dyes are compatible with PAG oil. Some types of dye decrease the oil viscosity or may chemically react with the oil.
- R-134A leak detection dye requires time to work. Depending upon the leak rate, a leak may not become visible for between 15 minutes and 7 days.
- To prevent false diagnosis, thoroughly clean any residual dye from the service port with a rag and the approved fluorescent dye cleaner J 43872 . See «Special Tools»(ref-197627-S36369102382005101200000) .
Halogen Leak Detector
| CAUTION | Do not operate the detector in a combustible atmosphere since its sensor operates at high temperatures or personal injury and/or damage to the equipment may result. |
Ensure that the vehicle has at least 0.45 kg (1 lb) of refrigerant in the A/C refrigeration system in order to perform a leak test. Refer to Refrigerant Recovery and Recharging for recharging the A/C system.
| IMPORTANT | Halogen leak detectors are sensitive to the following items: Windshield washing solutions Many solvents and cleaners Some adhesives used in the vehicle |
Clean and dry all surfaces in order to prevent a false warning. Liquids will damage the detector.
| IMPORTANT | Follow a continuous path in order to ensure that you will not miss any possible leaks. Test all areas of the system for leaks. |
Follow the instructions supplied with the J 39400-A . See Special Tools .
Defrosting Insufficient
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: Time required to defrost the windshield is longer than normal. | |||
| 1 | Were you sent here from Symptoms or another diagnostic table? | Go to Step 2 | Go to Symptoms - HVAC Systems - Automatic in HVAC Systems - Automatic |
| 2 | Start the engine. Select the DEFROST mode. Select the maximum blower speed. Does sufficient air flow from the defroster outlets? | Go to Step 3 | Go to Step 10 |
| 3 | Measure the engine operating temperature. Does engine reach a normal operating temperature? | Go to Step 4 | Go to Step 8 |
| 4 | Select the minimum blower speed. Select the maximum temperature setting. CAUTION: Refer to Moving Parts and Hot Surfaces Caution in Cautions and Notices. Feel the temperature of the inlet and outlet hoses at the heater core. Does the inlet hose feel warmer than the outlet hose? | Go to Step 11 | Go to Step 5 |
| 5 | Test the operation of the A/C compressor clutch. Does the A/C compressor clutch engage? | Go to Step 7 | Go to Step 6 |
| 6 | Repair the A/C compressor clutch. Refer to HVAC Compressor Clutch Does Not Engage in HVAC Systems - Automatic. Is the repair complete? | Go to Step 14 | |
| 7 | Perform the A/C system performance test. Refer to Air Conditioning (A/C) System Performance Test (LH2 w/ Standard Cooling) or Air Conditioning (A/C) System Performance Test (LY7 w/Standard Cooling) or Air Conditioning (A/C) System Performance Test (LH2 w/ Heavy Duty Cooling) or Air Conditioning (A/C) System Performance Test (LY7 w/ Heavy Duty Cooling) . Is the A/C system operating within the specifications? | Go to Step 9 | Go to Step 12 |
| 8 | Repair the low engine temperature concern. Refer to Engine Fails To Reach Normal Operating Temperature in Engine Cooling. Is the repair complete? | Go to Step 14 | |
| 9 | Inspect for correct operation of the recirculation door. Is the recirculation door operating correctly? | Go to Step 14 | Go to Step 13 |
| 10 | Repair the air delivery concern. Refer to Air Delivery Improper in HVAC Systems - Automatic. Is the repair complete? | Go to Step 14 | |
| 11 | Repair the heating concern. Refer to Heating Performance Diagnostic . Is the repair complete? | Go to Step 14 | |
| 12 | Repair the A/C performance concern. Refer to Symptoms - HVAC Systems - Automatic in HVAC Systems - Automatic. Is the repair complete? | Go to Step 14 | |
| 13 | Repair the recirculation door concern. Refer to Air Recirculation Malfunction in HVAC Systems - Automatic. Is the repair complete? | Go to Step 14 | |
| 14 | Operate the system in order to verify the repair. Did you find and correct the problem? | System OK | Go to Step 2 |
| CAUTION |
|---|
| Refer to Moving Parts and Hot Surfaces Caution in Cautions and Notices. |
Defrosting Insufficient
Eliminating Air Conditioning Odor
Odors may be emitted from the air conditioning system primarily at start-up in hot, humid climates. The following conditions may cause the odor
- Debris is present in the HVAC module.
- Microbial growth on the evaporator core
When the blower motor fan is turned ON, the microbial growth may release an unpleasant musty odor into the passenger compartment. To remove odors of this type, the microbial growth must be eliminated. Perform the following procedure
Deodorize the evaporator core using Deodorizing Aerosol Kit.
Perform the following steps in order to deodorize the A/C system
- Ensure that the plenum that draws outside air into the HVAC module is clear of debris.
- Disable the A/C compressor clutch operation by disconnecting the clutch coil electrical connector.
- Dry the evaporator core by performing the following steps: Start the engine. Select the maximum temperature setting. Select the recirculation mode. Run the blower motor on high for 10 minutes.
- Locate an area in the air conditioning duct between the blower motor and the evaporator core downstream of the blower motor.
- Drill a 3.175 mm (0.125 in) hole where the hole will not interfere with or damage the following components: The blower motor The evaporator core Any other operating part the of system
- Wear safety goggles and latex gloves in order to perform the following actions: Select the maximum blower speed. Insert the deodorizer extension tube into the hole to the mark on the extension tube. Use short spray bursts and vary the direction of spray for a 2-3 minute period of time.
- Shut the engine OFF. Allow the vehicle to sit for 3-5 minutes.
- Seal the 3.175 mm (0.125 in) hole with body sealer or room temperature vulcanizing sealer (RTV) gasket compound.
- Start the engine.
- Operate the blower motor on high for 15-20 minutes to dry.
- Reconnect the A/C compressor clutch coil electrical connector.
- Verify proper clutch operation.
- Using the scan tool enable the afterblow. Refer to «Afterblow Enable Procedure»(ref-197560-S24336775342005101200000) in HVAC Systems - Automatic.
Refrigerant Recovery and Recharging
Tools Required
- J 43600 ACR 2000 Air Conditioning Service Center. See «Special Tools»(ref-197627-S36369102382005101200000) .
- J 45037 A/C Oil Injector. See «Special Tools»(ref-197627-S36369102382005101200000) .
| CAUTION | Avoid breathing the A/C Refrigerant 134a (R-134a) and the lubricant vapor or the mist. Exposure may irritate the eyes, nose, and throat. Work in a well ventilated area. In order to remove R-134a from the A/C system, use service equipment that is certified to meet the requirements of SAE J 2210 (R-134a recycling equipment). If an accidental system discharge occurs, ventilate the work area before continuing service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers. |
| CAUTION | For personal protection, goggles and gloves should be worn and a clean cloth wrapped around fittings, valves, and connections when doing work that includes opening the refrigerant system. If R-134a comes in contact with any part of the body severe frostbite and personal injury can result. The exposed area should be flushed immediately with cold water and prompt medical help should be obtained. |
Note. R-134a is the only approved refrigerant for use in this vehicle. The use of any other refrigerant may result in poor system performance or component failure.
Note. To avoid system damage use only R-134a dedicated tools when servicing the A/C system.
Note. Use only Polyalkylene Glycol Synthetic Refrigerant Oil (PAG) for internal circulation through the R-134a A/C system and only 525 viscosity mineral oil on fitting threads and O-rings. If lubricants other than those specified are used, compressor failure and/or fitting seizure may result.
Note. R-12 refrigerant and R-134a 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 likely to occur. Refer to the manufacturer instructions included with the service equipment before servicing.
The J 43600 is a complete air conditioning service center for R-134a. See Special Tools . The ACR 2000 recovers, recycles, evacuates and recharges A/C refrigerant quickly, accurately and automatically. The unit has a display screen that contains the function controls and displays prompts that will lead the technician through the recover, recycle, evacuate and recharge operations. R-134a is recovered into and charged out of an internal storage vessel. The ACR 2000 automatically replenishes this vessel from an external source tank in order to maintain a constant 5.45-6.82 kg (12-15 lbs) of A/C refrigerant.
The ACR 2000 has a built in A/C refrigerant identifier that will test for contamination, prior to recovery and will notify the technician if there are foreign gases present in the A/C system. If foreign gases are present, the ACR 2000 will not recover the refrigerant from the A/C system.
The ACR 2000 also features automatic air purge, single pass recycling and an automatic oil drain.
Refer to the J 43600 ACR 2000 manual for operation and setup instruction. See Special Tools . Always recharge the A/C System with the proper amount of R-134a. Refer to Refrigerant System Capacities for the correct amount.
A/C Refrigerant System Oil Charge Replenishing
If oil was removed from the A/C system during the recovery process or due to component replacement, the oil must be replenished. Oil can be injected into a charged system using J 45037 . See Special Tools . For the proper quantities of oil to add to the A/C refrigerant system, refer to Refrigerant System Capacities .
Balancing Procedure
- Remove the oil drain bolt from the replacement A/C compressor.
- Drain the oil from the compressor oil drain into a clean graduated cylinder.
- Drain the oil from the suction and discharge ports into the clean graduated cylinder. Rotate the compressor shaft to assist in draining the compressor.
- Add back the same quantity of new PAG oil into the replacement compressor as drained from the removed compressor through the compressor oil drain. Refer to the amount of refrigerant oil recorded during the compressor removal.
- Install the compressor oil drain bolt. Tighten: Tighten the bolt to 30 N.m (22 lb ft).
Tools Required
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 39400-A Halogen Leak Detector. See Special Tools .
J 38185 Hose Clamp Pliers
J 38185 Hose Clamp Pliers
J 38185 Hose Clamp Pliers
J 38185 Hose Clamp Pliers
J 38185 Hose Clamp Pliers