Temperature Gauge Issues - Chevy and GMC Duramax Diesel Forum
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Old 11-20-2011, 09:37 AM   eBay Motors  #1 (permalink)
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Temperature Gauge Issues

I drive 2005 Duramax with 130K. This truck has never hauled anything.
Approximately a year ago, I started having issues with my Temp Gauge. It would randomly start dancing around causing my DIC to read Engine Coolant Hot and then if she hits red, Engine Overheating with the bells dinging. Never once has a service engine soon light come on. This would happen usually if the vehicle was washed, like water was affecting a connection somewhere. Eventually it would go away. Now, it has started to happen while dry. I will start my truck and it will idle roughly, with the gauge dancing around. The truck will drive absolutely fine and still have the temp gauge dance around and trip the bells for the engine overheating. Come to a stop light and the idle will be rough (Lugging) with the gauge fluctuating back and forth. One major related issue would be my Elevated Engine Idle will not properly work when its cold out. Once the temp needle starts dancing the computer tells the Elevated idle to shut off. I was told the T stats would not cause this action, usually that are stuck open or shut. Could this be a cluster problem? Perhaps a bad stepper motor? I have replaced the stepper motor for the speedometer already. Could there be a corroded connection somewhere that is causing this? It seems electrical to me, but what do I know. All suggestions or perhaps even the actual cause would be greatly appreciated.
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Old 11-20-2011, 11:11 AM   eBay Motors  #2 (permalink)
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First make sure the coolant is full-- and you have bleed the system of air. That is the small bolt at the front of the thermostats. Do you have to add coolant regularly-?

If you have air, you might have to drive it and bleed again.

After you drive the truck, and is parked overnight-- before you start it--check the upper radiator hose. Is it easy the compress-? That may indicate you have a bad head gasket. Which I suspect is your problem.

Is it collapsed-? That is caused by a sticky reservoir cap-- wash with soapy water or replace.
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Old 11-20-2011, 02:52 PM   eBay Motors  #3 (permalink)
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I'll check the hose in the morning. Right now I shouldnt have air, coolant came out upon filling up from the bleed nut. I did just read that if you have pressure build up in the reserve tank that the radiator cap is faulty. Could that be a possible culprit? What might the damage be on a head gasket repair?
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Old 11-21-2011, 06:48 AM   eBay Motors  #4 (permalink)
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upper radiator hose

When i checked it this morning, it was neither collapsed or firm like a tennis ball. I could sqeeze it together.
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