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The coolant temp sensor can be measure for resistance to determine if it's working properly. Or a scanner can be used with monitoring capabilities to check the signal from the temp sensor.

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Many Chevys use two temperature devices; a switch and a sender. The sender is used for the temp gauge so make sure you address the switch if your model year has separate devices. A cheap device that is easy to change so if you decide to just try it, it won't break the bank.]]> http://action.publicbroadcasting.net/cartalk/posts/list/2125048.page#2609981 http://action.publicbroadcasting.net/cartalk/posts/list/2125048.page#2609981 GMT http://action.publicbroadcasting.net/cartalk/posts/list/2125048.page#2609974 http://action.publicbroadcasting.net/cartalk/posts/list/2125048.page#2609974 GMT