Visual Inspection, Check Charge, Check Electrical & Clutch System
B. VISUAL INSPECTION: Engine OffCheck for:
1. Blown A/C fuse.
2. Loose or disconnected A/C electrical connectors or broken wires at compressor and line mounted switches.
3. Proper A/C blower operation (Section 1B in service manual).
4. Proper engine cooling fan operation or restricted air flow. (see service manual for procedure.)
5. Loose, damaged, or missing compressor drive belt.
6. Proper temperature door operation. (On mechanical temp door only, move temp door rapidly from cold to hot. Listen for temp door hitting at each end. Adjust as necessary.)
7. Heat damaged compressor clutch or free spinning clutch driver.
FIGURE 1 - TESTING HOOKUP:
C. CHECK SYSTEM REFRIGERANT CHARGE: Engine Off
1. Connect manifold gage set (Figure 1) to system high and low gage fittings. Check that refrigerant charge is 50 psi minimum before continuing quick check procedure.
2. If system has low or no charge, refer to service manual and:
a. Charge system with one can of R12 refrigerant.
b. Leak test system.
c. Repair leaks.
d. Evacuate and charge system with recommended amount of refrigerant.
e. Leak test system.
D. CHECK ELECTRICAL SYSTEM FOR CLUTCH ENGAGEMENT: Engine Running At Idle
1. Set A/C controls to NORMAL, FULL COLD, and HIGH blower speed.
2. Check that clutch engages. If clutch does not engage, disconnect clutch terminal wire connector and temporarily wire directly to battery.
a. If clutch engages with direct wiring, problem is electrical. Perform service manual electrical diagnosis.
b. If clutch does not engage with direct wiring, replace clutch coil assembly per Section 1B of service manual.