Viper GTS V10-8.0L VIN E (1999)
Radiator Cooling Fan Motor Relay: Description and Operation
RADIATOR FAN ON RELAY - PCM OUTPUT
The radiator fan ON relay energizes when the PCM provides a ground to the relay. The radiator fan relay is located below the heater blower motor
housing. The PCM grounds the radiator fan relay when engine coolant exceeds 97°C (207°F). The PCM turns the fan off when coolant
temperature drops to 94°C (201°F). Also, the PCM energizes the ON relay whenever the A/C system operates. Refer to Radiator Fan LOW/HIGH
Relay for fan operation.
RADIATOR FAN LOW/HIGH RELAY - PCM OUTPUT
The radiator fan LOW/HIGH relay works in conjunction with the radiator fan ON relay. If the coolant temperature is below 102°C (216°F) the
current flow for the fan is through the normally closed contacts of the LOW/HIGH relay. If the coolant temperature is above 102°C (216°F) the
PCM grounds the LOW/HIGH relay and the radiator fan changes to high speed. The PCM turns off high speed fan operation when coolant
temperature drops to 102°C (216°F). The low speed will continue until temperature drops below 94°C (201°F). Cooling fan turns off at 77 mph,
when accelerating, and turns back on at 67 mph.
