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I have a 94 chevy pick up with a 5.7l and a 350hp. Shat would cause my temp to go to max when my truck is turned off?


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Location: Oregon
does it go up to the top even if the engine is cold? as in you turn the key on first thing in the morning but haven't started the truck engine yet but the gauge shows hot on a stone cold engine? if that's the case I would look at the temp sender and unplug in at the sender. If the gauge drop all the way down, you need to try a new sender. If it still goes at the top look for a shorted wire or bad circuit to /or inside the dash unit

if it reads hot because the engine is hot, look for reasons why the engine is overheating


   
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My temp this morring was at 260 when my truck was left of over night.


   
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ok, unplug the sender and see if the gauge goes down


   
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Where is the sender at?


   
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it near the front of the motor pretty close to the thermostat housing.


   
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