Question about 2004 GMC Sierra 2500

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Overheating I own a GMC 2004 2500 and it keeps on over heating. I have in the shop right now but the GM Dealership cannot find anything wrong with it. They have did the pressure test no leaks thermostat is working fine they have even check the back pressure on the exhaust to make sure the catalyst converts are not plugged and still no where. Anyone have any ideas.

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  • lesedwards Jun 24, 2008

    Yes as far as I know they said the fan was kicking in and out as it needed to and they cannot find any leaks in the water pump.

  • ggillingham Feb 02, 2009

    Ours is a 2005. Just replaced the thermostat but still hot. Not blowing hot air inside the truck, so apparently the water is not getting into the engine. When I replaced the thermostat I replaced the radiator cap after filling the reservoir as full as I could, then found out it should have been left off during filling.

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Have they checked to see if the clutch fan is working properly and water pump?

Posted on Jun 24, 2008

  • Lee Quiroz
    Lee Quiroz Jun 24, 2008

    The shop you have your truck at should make sure that when the truck is at operating temp. that both the upper and lower radiator hoses are close to the same temp. this will tell them if the water pump is doing it's job circulating the water. The water pump doesn't have to leak to be improperly working. A radiator cap being worn out will cause the later model cars to have an overheating problem as well. The cooling system cannot pressurized the way it should if the cap is bad.

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