Condenser Fan: Description and Operation

Voltage is provided at all times to the condenser fan relay (contacts) through fuse 35. With the ignition switch in ON (II), voltage is provided to the coil of the relay through fuse 13. When you press the A/C switch and put the blower switch in the LO, M1, M2, or HI position, and the A/C thermostat is closed, the condenser fan relay energizes, and the condenser fan motor runs.

As described under Compressor Controls, the condenser fan relay (coil) is grounded when an A/C request input is made to the engine control module (ECM). If the engine is running, the condenser fan will come on when you turn on the A/C system.

The A/C system will shut off if the A/C pressure switch or A/C thermostat opens. The A/C pressure switch will open when the A/C system high side pressure becomes too high or low. The A/C thermostat is normally closed, but will open when the temperature in the system falls below 35°F (-1.5°C).