C-10 ~ Air Conditioning System Function Check

Circuit Description
When the Air Conditioning (A/C) diagnostic test mode is selected, the Engine Control Module (ECM) will supply a ground to the A/C Clutch Relay. Battery positive voltage is then supplied to the A/C Clutch through the completing of circuit through the Thermo Switch relay, which is part of the A/C "ON/OFF" Switch Circuit. If the A/C System exhibits high pressure or an overheating condition exist, the A/C System will be disabled by the open of the A/C High Pressure Switch or the A/C Thermo Switch.




Diagnostic Aids
- The A/C High Pressure Switch is located in the high pressure side A/C Hose.
- The Thermo Cut-Out Switch is part of the A/C Evaporator mounted under the dash.