Troubleshooting Hints
PERFORM BEFORE CONSULTING SYMPTOM/DIAGNOSIS GUIDEBlower Problems:
- Check RH underhood fuse block fuse 3.
- Check I/P fuse block fuse 5D.
- Check that grounds G103 and G200 are clean and tight.
- If blower runs all the time with ignition switch at OFF, check related wiring for a short to battery. If wiring is OK, replace high speed blower relay.
Compressor Problems:
- Check relay center fuse 5.
- Check I/P fuse block fuse 9C.
- Check that A/C compressor clutch connector is firmly seated.
Air Delivery Problems:
- Check I/P fuse block fuse 5D.
- Check for manifold vacuum to vacuum tank at black hose.
If vacuum is not present: check hoses back to engine intake manifold tap.
Assure vacuum check valve is operating property.
If vacuum is present at vacuum tank: check for vacuum at violet hose.
Check black hose to cruise control servo. If hose is OK: replace vacuum tank, Refer to Disabling/Enabling SIR System. Air Bag Systems
- Check operation of A/C temperature valve by setting temperature lever to COOL, then to WARM, then back again. A/C temperature valve should move evenly through full travel each time temperature setting is changed. If valve moves unevenly or erratically, make sure valve is not binding, refer Heater Ventilation and Air Conditioning (HVAC). Testing and Inspection