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  1. #1

    Default Water temp cycling high and low

    I already have a guess, but I'm not sure.

    Running an errand today, I noticed a "check gauges" warning and I noticed the water temperature was near the top warning level.

    I immediately pulled over, but just as soon as I did that, the temperature dropped back to normal. I decided to keep going toward my destination. The water temps never did get that high again, but I noticed it would cycle a bit high and low.

    I'm going to make a random guess that it might be the thermostat that is going. Any other ideas?


  2. #2


    Could be the thermostat sticking or coolant level low.

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    T-stat is cheap!

    What year you driven, could be time for a power flush.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  4. #4


    yea i would check both the termostat and coolant or could also be ur water pump

  5. #5

    Cool Water temp cycling high and low

    Sounds like what I had years ago with my 90 IROC Camero, turned out to be the transmission was overheating (ended up having it rebuilt) and the tranny cooler went threw the radiator so it cause the engine temp to go up. When I pulled over and let idle the water temp went back down.

  6. #6


    Forgot to reply back.
    Had a pressure test did the full service check (they talked me into it), and it turned out to be what I suspected in the first place.

    Some hoses were leaking a little,but I was broke just about to leave on vacation on the weekend, so I had them just replace the t-stat. Engine temps are rock solid now.

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