erratic temperature gauge. - Ford Powerstroke Diesel Forum
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Old 12-30-2009, 06:02 PM
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erratic temperature gauge.

Everything will be running fine with my truck and all of the sudden I'll notice the temperature gauge dives all the way down to the bottom. It'll bounce back up and down a bunch of times. Sometimes the "check gauge" light comes on and will stay on. when this happens i hear the engine sounds a lot different, like it's working harder. Sometimes the check engine light will go on also. After sitting for the night, though, when i fire up the next day it is fine.

This has happened sporatically for the past few months but lately it has been happening quite frequently(almost daily).

I was told air in the coolant system (my coolant level appears to be just fine) which could indicate engine problems or possibly electrical.

I don't have the $$ to just start replacing things. Wondered if anyone had any thoughts or where i should start. Thermostat, Coolant flush, ECoolant Temp sensor?
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Old 12-31-2009, 11:09 AM
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anyone???????
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Old 01-01-2010, 04:14 PM
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First ya need to determine if it's just a faulty gauge or a real problem.
You need to get someone to read live data and compare the temp readings the computer is seeing compared to what the gauge is showing.

My money is on a bad gauge or connection. Now this in itself can be major, I do not know about an 03 but an 05 you have to change out the whole cluster
at 375.00 or go with these aftermarket gauge systems.
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Old 01-03-2010, 08:05 AM
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There is no way the real temperature would match the actual engine b/c of the way the gauge bounces all around. Does the computer recieve the temp data after it passes through the gauge? That would explain why the engine changes when the needle stays zero'ed and the check gauge light comes on and stays on.
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