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2003 GMC Sierra coolant system

Discussion in 'Chevy Trucks' started by WCI, Apr 14, 2006.

  1. WCI

    WCI Junior Member
    Messages: 4

    2003 GMC Sierra coolant system
    With the plow on the truck and the temperature above 26 degrees it overheats.
    I bought the truck in the fall of 02 and through the winter of 02/03 I had no problem.
    In the winter of 03/04 it overheated one time, 04/05 it overheated every time I was out.
    It will overheat and then return to normal until the next time I am out. Never overheats more than one time per run. Any idea what the problem is? Talking with the dealer, they say they do not know of any known problems.
  2. WCI

    WCI Junior Member
    Messages: 4


    1500 HD, Snow plow prep, trailer tow and V-8
  3. Sounds like the infamous fan clutch issue

    Do a search on the "fan clutch" here on the forum. You will find several threads that discuss that issue at length. I'm not sure if it applies to your 1500 but it's a big issue with the 2500's.
  4. Frozen001

    Frozen001 Senior Member
    from Rome NY
    Messages: 908

    It may apply, but the TSB it self is for the 2500HD/3500 with the 6.0L engine. The way he describes it(over heats one time when it is out) is sounds like a stuck thermostat.
  5. polarplowing

    polarplowing Member
    Messages: 59

    I would check the fan clutch and the thermostat. My 2000 silverado 1/2 ton overheated on me I the fix was the fan clutch.


  6. durphman

    durphman Junior Member
    from Eastern
    Messages: 6

    I have the same truck with no problems maybe thermostat or wiring?. What engine is it 4.8, 5.3 6.0