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What exactly does a coolant temp. sensor do other than obviously tell the cpu as well as you the temp. of your coolant?

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Primary cooling fan only comes on when i turn ac on

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If and when the engine reaches 220 degrees, the engine temp sensor should be sending that data to the computer and it should ground the fan relay to activate it.
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1 Answer

What is coolant temp sensor

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How many temp sensors does a 2000 s10 truck have and what do they do

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Need exact location and picture of coolant temp sensor on tdi vw jetta 2004 please Thanks

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