A/C Refrigerant System, Checking Cooling Performance

A/C Refrigerant System, Checking Cooling Performance

NOTE: A/C Evaporator Temperature Switch E33 (if equipped) switches A/C compressor OFF only in special instances so evaporator does not ice up; variable displacement A/C compressor maintains temperature of 0 degrees C (32 degrees F) in evaporator.

Test Conditions
- A/C refrigerant system fully charged
- A/C Clutch N25 and compressor function OK
- Condenser and radiator clean and free of obstructions
- Air distribution can be adjusted properly
- Wiring OK as per wiring diagram
- Outside (ambient) temperature 20 degrees C - 30 degrees C (68 degrees F-86 degrees F)

Checking
- Start engine.
- Set temperature control to maximum "cold".
- Press A/C button and select second blower speed.
- Adjust air distribution to instrument panel outlets.
- Insert thermometer into center instrument panel outlet.
- Raise engine speed to approximately 1500 RPM.

Specified Result
With normal humidity and outside (ambient) temperature between 20 degrees -25 degrees C (68 degrees -77 degrees F), system is sufficiently charged if air temperature from center instrument panel vent drops below 10 degrees C (50 degrees F) within one minute.

For higher ambient temperatures and/or higher humidity, specified air temperature from center instrument panel vent can be slightly higher.