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160 Thermostat Help


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Is there a way to check without pullin it...it hits 260+ in a few minutes of running...ya it's an 04

 

You can check the fan clutch by spinning the fan with your hand (with the engine off of course). It should have a slight drag to it. If it spins and keeps spinning it's bad. Also make sure the fan is moving at a good rate of speed with the engine running. I really don't think this is your problem though. It could be a number of things from your thermostat not opening at all to a head gasket issue. How many miles you have on the truck?

Edited by COss04 (see edit history)
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Just over 80k

 

It's not very common but I wouldn't rule out head gaskets. Before you start throwing parts at it you can run down to NAPA and get a head gasket test kit. It comes with a turkey baster looking tube and you pour a blue fluid in it, remove your surge tank cap and place the tester in the hole where the cap goes and you suck a sample of the air out of the surge tank. If the tester picks up any traces of hydrocarbons (exhaust gases) in the coolant then the color of the fluid starts to change to a yellow-ish color. If the fluid color changes then you have a head gasket issue. Or you can always take it to a shop and at least have them diagnose it and just pay the diagnostic fee. It's sometimes more cost effective than wasting money on throwing part after part at it until it's fixed.

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