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switch from correctly monitoring the refrigerant sys- Also verify that the refrigerant system has the cor- rect refrigerant charge. See Refrigerant System For circuit descriptions and diagrams, refer to 8W-42 - Air Conditioning/Heater in Group 8W - Wir- (1) Disconnect and isolate the battery negative cable. (2) Unplug the low pressure switch wire harness connector from the switch on the accumulator fitting. (3) Install a jumper wire between the two cavities of the low pressure switch wire harness connector. (4) Connect a manifold gauge set to the refrigerant system service ports. See Refrigerant System Service (5) Connect the battery negative cable. in any A/C position and start the engine. (7) Check for continuity between the two terminals of the low pressure switch. There should be continu- REFRIGERANT SYSTEM LEAKS WARNING: REVIEW THE WARNINGS AND CAU- If the air conditioning system is not cooling prop- erly, determine if the refrigerant system is fully- An electronic leak detector designed for R-134a refrigerant is recommended for locating and confirm- An oily residue on or near refrigerant system lines, connector fittings, components, or component seals To detect a leak in the refrigerant system, perform one of the following procedures: SYSTEM EMPTY (1) Evacuate the refrigerant system. See Refriger- ant System Evacuate in this group for the proce- (2) Connect and dispense 0.283 kilograms (0.625 pounds or 10 ounces) of R-134a refrigerant into the (3) Position the vehicle in a wind-free work area. This will aid in detecting small leaks. (4) With the engine not running, use a electronic R-134a leak detector and search for leaks. Because (5) To inspect the evaporator coil for leaks, insert the electronic leak detector probe into the center SYSTEM LOW (1) Position the vehicle in a wind-free work area. This will aid in detecting small leaks. (2) Bring the refrigerant system up to operating temperature and pressure. This is done by allowing (3) With the engine not running, use a electronic R-134a leak detector and search for leaks. Because (4) To inspect the evaporator coil for leaks, insert the electronic leak detector probe into the center VACUUM SYSTEM Vacuum control is used to operate the mode doors in the standard equipment manual temperature con- A vacuum system test will help to identify the source of poor vacuum system performance or vac- 24 - 26 HEATING AND AIR CONDITIONING WJ DIAGNOSIS AND TESTING (Continued) |