System Performance Test - Temp & Pressure Relationships

Fig. 40 A/C system performance test (recirculating-to-discharge air temperature).:

Fig. 41 A/C system performance test (ambient air temperature-to-compressor pressure).:

1. The following system performance test must be performed as follows:
a. Vehicle must be parked indoors or in the shade and in a well ventilated place.
b. Vehicle doors must be closed, door windows open and hood open.
c. Temperature lever position must be set to maximum cold.
d. Air control lever position set to FACE.
e. Intake lever position set to RECIRC.
f. Fan lever set at 4.
g. Engine speed at 1500 RPM.
2. The time required to start the test after the air conditioner starts operating should exceed 10 minutes.
3. Refer to Figs. 40 & 41 for recirculating to discharge air temperature and ambient air temperature to compressor pressure test readings.