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  1. #1

    Default Temperature Guage bouncing

    The guage has been moving from normal (190) to 230 and then to 160 and then back to normal. Today the heater stopped blowing heat. Whats wrong? Thermostat?

  2. #2
    Master Mechanic BurbanMan's Avatar
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    Quote Originally Posted by ROCKTA View Post
    The guage has been moving from normal (190) to 230 and then to 160 and then back to normal. Today the heater stopped blowing heat. Whats wrong? Thermostat?
    edit: I managed to overlook the part about the heater.... Definitely swap out the thermostat as that will be the least expensive place to start. If that doesn't fix it, I would have a coolant system diagnostic done. That can usually happen for about $30
    Last edited by BurbanMan; 11-14-2013 at 11:24 AM.
    Chuckie!!!


  3. #3

    Default

    Quote Originally Posted by ROCKTA View Post
    The guage has been moving from normal (190) to 230 and then to 160 and then back to normal. Today the heater stopped blowing heat. Whats wrong? Thermostat?
    If it stopped blowing heat I would suspect that the thermostat is moving slowly. But, there can be many other causes for it to stop blowing heat.

    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, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  4. #4
    Master Mechanic BurbanMan's Avatar
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    Quote Originally Posted by Pikey View Post
    If it stopped blowing heat I would suspect that the thermostat is moving slowly. But, there can be many other causes for it to stop blowing heat.
    you don't recon his sending unit and blend door actuator both went bad about the same time do you?
    Chuckie!!!


  5. #5

    Default

    Quote Originally Posted by BurbanMan View Post
    you don't recon his sending unit and blend door actuator both went bad about the same time do you?
    It is highly unlikely that they both went at the same time. It could be anything from air in the system to a clogged heater core, a bad sending unit, a bad stepper motor.

    Wait a second... What year and model truck are we talking about here? Is it rapidly bouncing or does it get to the operating temp then slowly drop?

    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, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  6. #6

    Default 1996 1500

    It is 1996 1500 GMC. The temp guage moves slowly. It will start off at 190 them run up to 230 and stay there a while then drop back down (liek if thermostat finally opened). It will do this often. Then today the heater wouldn't work but was still blowing cold air.



    Quote Originally Posted by Pikey View Post
    It is highly unlikely that they both went at the same time. It could be anything from air in the system to a clogged heater core, a bad sending unit, a bad stepper motor.

    Wait a second... What year and model truck are we talking about here? Is it rapidly bouncing or does it get to the operating temp then slowly drop?

  7. #7

    Default

    Quote Originally Posted by ROCKTA View Post
    It is 1996 1500 GMC. The temp guage moves slowly. It will start off at 190 them run up to 230 and stay there a while then drop back down (liek if thermostat finally opened). It will do this often. Then today the heater wouldn't work but was still blowing cold air.
    I would change the thermostat, they are cheap! While you are at it you might as well do a coolant flush and change the radiator cap.

    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, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  8. #8

    Default

    Have new thermostat in hand. Will be changing tonight. I'll let y'all know tomo. Thanx

  9. #9
    Sr. Mechanic poncho62's Avatar
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    Your antifeeze level is low......

    [B]1997 GMC

  10. #10
    Master Mechanic BurbanMan's Avatar
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    Quote Originally Posted by poncho62 View Post
    Your antifeeze level is low......
    thats actually a good pointer.
    Chuckie!!!


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