Question about 2005 Chevrolet Avalanche

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Problem with No Heat on 2005 Chevy Avalanche - Cooling System?

When I first start the truck, it warms up as normal on the temperature gauge, takes about 10 minutes - five-six miles of driving to reach 210 degress. But then the gauge shoots up to to around 230-240 degrees. It will then stay there for another couple miles. Then drops back to 210 degrees like normal. But then I lose my Hot Air from the heater. I do not recall this being a normal condition on the temperature gauge? And the heater used to always blow heat for me. I am not sure if this a Water Pump issue or a Thermostat issue? At first it appeared to be something wrong with the Heating System. But the temperature gauge has me looking to the cooling system issue. Has anyone else seen this before on a Chevy Avalanche?

2005 Avalanche Z71 with 5.3 liter engine

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  • drewgarber Jan 07, 2009

    OK let me try that, good easy suggestion.

  • murray261 Jan 20, 2009

    I have the same exact problem. My temp gauge does the same thing and no heat. I read that could possibly be a sticking thermostat. But then why wouldn't the heat work? I am taking to my Tech. today i'll post the results tonight or tomorrow.

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It is most likey a sticking thermostat it either gets stuck closed or open in your case closed so collant isnt getting to the heater core and all you get is cold air blowing into the truck.
its a simple fix you can either do it your self or take it to a mechanic. now remember there are differnt thermostes so think about the climat you live in and get one according to that

Posted on Jan 29, 2009

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It is the Water Pump, mine was the Water Pump, they develop a coolant leak on the pump itself.

Posted on Jan 30, 2009

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It sounds like a water pump to me. Check the pump for leaks. then tak off the radiator cap. Start it up and watch, to see if the water circulates. (ONLY TAKE THE CAP OFF WHEN ENGINE IS COOL)

Posted on Jan 07, 2009

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