Test C: A/C Compressor Function Test

Test C A/C Compressor Function Control Test:

C1. Remove the connectors from the A/C Low Pressure Switch and the A/C High Pressure Switch and connect a fused jumper between the terminals of each connector.

^ If either switch is open, battery voltage will be present at terminal A of the A/C Compressor Control Relay when the jumper is connected.
^ If the A/C Low Pressure Switch is open, check for normal refrigerant charge. If refrigerant charge is normal, replace the switch. If the refrigerant charge is low, follow procedures in for refrigerant diagnostics.
^ If A/C High Pressure Switch is open, replace it.
^ If both switches are good but battery voltage is not present at the A/C Compressor Control Relay, check LT GRN (66), BLK/ PNK (67) and BLK/LT GRN (366) wires between the switches for opens (see schematic).