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My temp. gauge climbs to HOT; not sure what to replace - Thermostat or Fan relay on 2002 Honda Civic Si

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Driving along and my temperature gauge rises to hot. Sometimes it the temp. will drop on the gauge, some times it won't.
(3) Answers
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does the fan work? if fan works relay is good
Have you checked the coolant level (cold), in both rad. and reservoir?
I would try changing the t stat if that doesnt work then I would check the head gasket
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