Question about 1991 Chevrolet Silverado 2500

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1991 siverados temp Gage dosent work, is it the temp sensor or what?

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Replace the temp. sending unit. It's usually found on the driver side head on the side above the exhaust manifold.

Posted on Jun 23, 2008

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Codes 21 & 24


HI
the (ECT)coolant temp sensor have two wire and you can test it by (AVO meter) the two wire :-
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the 2nd is have 5 volt whine disconnect the connector
of (ECT) and less then whine connected the (ECT)
the (ECT)was electronic thermo resistor
the one wire sensor work to coolant temp gage in dashboard

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with my best wishes

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