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Wrenchbender Ret · 01-02-2014, 11:48 AM

The red light should come on when the key is turned to start position. The green comes on when the key is in run position & goes out when the coolant starts to warm up. Its a good idea to replace the sending unit everytime you get a truck with this system. There is no easy way to test the hot side.

01-02-2014, 11:48 AM	#8
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: temp light The red light should come on when the key is turned to start position. The green comes on when the key is in run position & goes out when the coolant starts to warm up. Its a good idea to replace the sending unit everytime you get a truck with this system. There is no easy way to test the hot side.