A/C Refrigerant System Cooling Performance, Checking

A/C Refrigerant System Cooling Performance, Checking

NOTE: Variable displacement A/C compressor maintains temperature of 0 degree C (32 degree F) in evaporator.

Test conditions
- A/C refrigerant system fully charged
- Compressor and Compressor Regulator Valve -N280- 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 degree C - 30 degree C (68 degree F - 86 degree F)

Checking
- Start engine.
- Set temperature control to maximum cold ("LO")
- Select medium 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 - 25 degree C (68 - 77 degree F), system is sufficiently charged if air temperature from center instrument panel vent drops below 10 degree C (50 degree F) within one minute.

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