The coolant switch that operates the radiator fans...
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1999 Chevrolet Monte Carlo Question: coolant location
dandd January 01, 2011, 15:32Master
It is the engine coolant temperature sensor, not a switch
http://repairpal.com/engine-coolant-temperature-sensor -> here is a link that describes it, however, there is a fan relay, and other things involved in the operation of your cooling fan. Does the fan come on if you turn on the A/C? Because it should.
Answer #2delane 72 garage and body shop January 01, 2011, 19:31Master
coolent temp sensor