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4. Start the engine and allow it to idle. After the engine has reached normal operating temperature, allow the pas- senger compartment to heat up. This will create the need for maximum refrigerant flow into the rear A/C evap- 5. If the refrigerant charge is sufficient, the discharge (high pressure) gauge should read 827 kPa to 1655 kPa (120 psi to 240 psi). The suction (low pressure) gauge should read 207 kPa to 345 kPa (30 psi to 50 psi). If OK, go WARNING: 2 or personal injury can result. 6. If the suction (low pressure) gauge reads within the specified range, freeze the rear A/C expansion valve for 30 seconds using liquid CO 2 or another suitable super-cold material.Do not spray R-134a or R-12 refrigerant on the rear A/C expansion valve for this test. The suction (low pressure) gauge reading should drop by 69 kPa 7. Allow the rear expansion valve control head to thaw. The suction (low pressure) gauge reading should stabilize at 207 kPa to 345 kPa (30 psi to 50 psi). If not OK, replace the faulty rear A/C expansion valve. 8. When expansion valve testing is complete, test the overall A/C system performance (Refer to 24 - HEATING & AIR CONDITIONING - DIAGNOSIS AND TESTING - A/C PERFORMANCE TEST). REMOVAL WARNING: Refer to the applicable warnings and cautions for this system before performing the following 1. Recover the refrigerant from the refrigerant system (Refer to 24 - HEATING & AIR CONDITIONING/ 2. Remove right rear quarter panel trim (Refer to 23 - BODY/INTERIOR/QUARTER PANEL TRIM - REMOVAL). 3. Remove the insulator (1) from around the rear A/C evaporator tubes (2) to gain access the two rear 4. Remove the two bolts that secure the rear A/C expansion valve (4) between the rear A/C evapora- 5. Remove the rear A/C expansion valve from between the rear A/C evaporator tubes and the 6. Install plugs in, or tape over the opened evaporator tubes and extension tube fittings and all rear expansion valve ports. HB PLUMBING - REAR 24 - 489 |