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  1. #1

    Default coolant high temperature

    Hey all,
    I have an 04 trail blazer. Yesterday a high coolant temperature warning message came on and the temp gauge had moved from 210(normal) to 260 (red zone). I shut off the engine and checked under the hood. Coolant reservoir was full. No apparent leaks anywhere. After cooling down I removed radiator cap, radiator full. I restarted and drove home, about 20 minutes, with no problem. Left engine idling for about 30 minutes. No problem, normal temperature, cooling fan running. Any thoughts?

  2. #2


    It could be a few things. Maybe your thermostat was sticking. The relay for your fan could be going out or the sensor is going bad. Unfortunately it is hard to tell with the one occurrence. If it happens again, check to see if the fan is on. then feel the upper radiator hose and see if you feel coolant going through it. No coolant could mean that the thermostat is stuck.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. #3


    Quote Originally Posted by Pikey View Post
    No coolant could mean that the thermostat is stuck.
    Or, perhaps the pump has decided to stop working.

    If the coolant has never been flushed, now might be a good time to do it. The factory fill is only good for 5 years.

    And, if your doing the flush, that would be a good time to toss the old t-stat.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

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