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overheating after replacing t-stat

Discussion in 'The Garage' started by bettabruce, Mar 15, 2005.

  1. bettabruce

    bettabruce Registered Member

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    Location:
    Jackson, MS
    My truck is still pegging out around 220 or 240 and dropping

    back down around 200 after I replaced the thermostat. What

    are some other possibilities?

    Thanks in advance.
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    I will make a list of things that need to be checked or replaced that could cause engine overheating.

    Radiator cap
    Radiator
    hoses
    belts
    water pump
    thermostat
    clutch fan/electric fan
    thermal electric fan switch

    Any number of these items can cause an engine to overheat. Did you install the thermostat correctly? The side with the spring goes to the engine side.
     
  3. 70~K5

    70~K5 1/2 ton status

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    I didn't have time to change a blown headgasket and clean out the cooling system one time so I took the merc wagon to a local shop to do the work. Left San Jose at night and drove to Bakersfield after the work was done. The next day when the air temp got hotter and the car overheated. Got a new thermostat for it. When I went to change the Tstat I found the shop had put it in backwards. That sure pissed me off.
     
  4. spearchucker

    spearchucker 1/2 ton status

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    I know this may sound stupid but do you have the fan shroud in place? Or did you do a body lift and modify the shroud?
     
  5. AkMudr

    AkMudr 1/2 ton status

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    After running the engine and expel the air pockets, did you top off the radiator?
     
  6. folkenheath

    folkenheath Worthless Trash Premium Member GMOTM Winner

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    Here's what I'd check, some of it is already mentioned.

    1 - top off coolant level
    2 - thermostat in backwards
    3 - faulty new thermostat

    always get the premium thermostats, the cheapo ones almost always go bad within a year or even sooner. Spend the extra few bucks and get the premium thermostats, like the stant premium version, or the robert shaw units are real good ones.
     

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