Radiator Cooling Fan Motor Relay: Description and Operation

RADIATOR FAN RELAYS-PCM OUTPUT
The cooling system uses one fan. The fan operates at two different speeds, low and high. Depending on engine coolant temperature, A/C system high side pressure, and transmission temperature, the fan operates at either low or high speed. The PCM controls radiator fan speed by grounding the coil side of either the low speed fan relay or the high speed fan relay. The ignition switch supplies voltage to the coil sides of the relay. When the PCM grounds the coil side of the relay, the contacts close and the battery supplies power to the fan.

The low speed and high speed fan relays are located in the Power Distribution Center (PDC). A decal on the inside of the PDC cover shows the locations of each relay and fuse contained in the PDC.