Temperature Switch (100/110 Degree C)

High Temperature Switch Location:

PURPOSE

The combination 100°C/110°C temperature switch, which is located near the thermostat housing, has two functions. One switches the electro-magnetic engine fan clutch "ON" and the other activates the auxiliary fan high speed circuit.

OPERATION

At coolant temperatures of approx. 230°F (110°C), the 110°C temperature switch completes the ground circuit for the high speed fan relay, activating the auxiliary fan (high speed). As the temperature drops below approx. 217°F (103°C) the circuit is opened and fan operation discontinues.
At coolant temperatures of approx. 212°F (100°C), the 100°C temperature switch completes a ground circuit for the compressor cut-out control unit. The compressor cut-out control unit then activates the engine electro-magnetic fan clutch. As the temperature drops below approx. 200°F (94°C) the grounded circuit opens and engine fan operation discontinues.