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DIAGNOSIS AND TESTING - REFRIGERANT SYSTEM LEAKS WARNING: REVIEW THE WARNINGS AND CAUTIONS IN THE FRONT OF THIS SECTION BEFORE PER- If the air conditioning system is not cooling properly, determine if the refrigerant system is fully-charged. (Refer to 24 An electronic leak detector designed for R-134a refrigerant is recommended for locating and confirming refrigerant An oily residue on or near refrigerant system lines, connector fittings, components, or component seals can indicate To detect a leak in the refrigerant system, perform one of the following procedures: SYSTEM EMPTY 1. Evacuate the refrigerant system. (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - STANDARD PROCEDURE). 2. Connect and dispense 0.283 kilograms (0.625 pounds or 10 ounces) of R-134a refrigerant into the evacuated refrigerant system. (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - STANDARD PROCEDURE). 3. Position the vehicle in a wind-free work area. This will aid in detecting small leaks. 4. With the engine not running, use an electronic R-134a leak detector and search for leaks. Because R-134a refrigerant is heavier than air, the leak detector probe should be moved slowly along the bottom side of all refrig- 5. To inspect the evaporator coil for leaks, insert the electronic leak detector probe into the center instrument panel outlet. Set the blower motor switch to the lowest speed position, the A/C button in the On position, and select the 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 the engine to run with the air conditioning system turned on for five minutes. 3. With the engine not running, use an electronic R-134a leak detector and search for leaks. Because R-134a refrigerant is heavier than air, the leak detector probe should be moved slowly along the bottom side of all refrig- 4. To inspect the evaporator coil for leaks, insert the electronic leak detector probe into the center instrument panel outlet. Set the blower motor switch to the lowest speed position, the A/C button in the On position, and select the STANDARD PROCEDURE REFRIGERANT SYSTEM SERVICE EQUIPMENT WARNING: EYE PROTECTION MUST BE WORN WHEN SERVICING AN AIR CONDITIONING REFRIGERANT WARNING: REVIEW THE WARNINGS AND CAUTIONS IN THE FRONT OF THIS SECTION BEFORE PER- When servicing the air conditioning system, a R-134a refrigerant recovery/recycling/charging station that meets SAE ZH PLUMBING 24 - 131 |