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  1. #1
    Sr. Apprentice
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    Default '97 5.7 Thermostat

    My thermostat is stuck open, I think. The temp is running about 150 to 160 and my mileage dropped. The thermostat bolts are both REALLY tight. Any hints on how to loosen them without damaging anything in the process???
    1997 Silverado, Ext cab, 4x4, 5.7, Loaded

  2. #2
    Legend unplugged's Avatar
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    Default

    For fasteners like the tstat bolts, I like to shock them without over torquing them. One of my favorite tools for this is the impact driver. The vibration and the incremental torque tends to get most screws, nuts, and bolts loose. If you have to replace the bolts, avoid dissimilar metals, and chase the threads in the block.
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  3. #3
    Sr. Apprentice
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    Default

    I completely forgot about an impact driver. Good suggestion.
    Thanks.
    1997 Silverado, Ext cab, 4x4, 5.7, Loaded

  4. #4

    Default

    If you don't have an impact driver take a large punch and hammer and strike the bolt several times square in the center of the bolt. This will loosen it up for you.
    Jim

    2004 SILVERADO 2500HD LS
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  5. #5

    Default

    carefull with it, t-stat bolts on the 350's are common to break off

    i let them sit in penetration fluid for a few minutes before wrenching them off
    GM TECH

    05 silverado shortbed

  6. #6
    Sr. Apprentice
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    Bausman, PA
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    Default

    Appreciate the helpful hints. Thanks and have a great day.
    1997 Silverado, Ext cab, 4x4, 5.7, Loaded

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