E.Check Refrigerant System Performance: Engine Off

FIGURE 1 - CONNECTING MANIFOLD GAGE SET:

FIGURE 2 - DIAGNOSTIC TEST CHART:

IMPORTANT: Follow this procedure exactly. It is designed to create enough cooling load to cause the V-5 compressor to go to full stroke, which is absolutely necessary for accurate test results. The following test was designed for typical garage conditions: 70-90~F, no sun load. Discharge air temperatures should be at least 20~F cooler than the outside ambient temperature.

1. Connect gage set to high and low A/C service fittings. Refer to Figure 1.

a. Some Cimarrons require removal of the in-line pressure switch to read discharge/high pressure.

b. On some Cimarrons the high side fitting is after the orifice tube and reads suction/low pressure instead of discharge/high pressure.

2. Check gage set accuracy by reading both gages. Readings should be equal. Correct gages as necessary.

3. Set high load test conditions:

a. Start engine and run at idle speed.

b. Open hood, close windows and doors.

c. Set A/C controls to HIGH blower and NORMAL cooling.

d. Run engine for five minutes.


4. Record and evaluate test results:

a. Record suction and discharge pressures. Pressure readings should be made when the fan is on.

b. Check diagnostic test chart and locate intersection of recorded suction and discharge pressures. Determine color of area in which the pressures intersect (white, gray, or black). Refer to Figure 2.

c. Go to the proper color heading for diagnosis and service procedures. Diagnose in the sequence given to minimize time and expense of repair. Service tips are given with each diagnosis.