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Little engine overheats unless the heater is on. Wierd

Discussion in 'Technical Chat' started by Garysquest, Jan 11, 2010.

  1. Jan 11, 2010 at 5:39 PM
    #1
    Garysquest

    Garysquest [OP] New Member

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    This is Gary here. I just joined your forum. I have a puzzler. I am a mechanic. I got this 2000 tacoma and it overheated to begin with. I went ahead and installed a new head gasket. It runs just fine if you have the heater on and fan on high. It supposedly has a new radiator. As soon as you shut down the heater it will overheat and boil into the overflow. Do you have to purge the air out of the radiator or do I have a bad water pump, or what? I dont get stumped too often but I am human. I thought about purchasing a engine block tester but my thinking is if it does fine with the heater on then it cant be the new head gasket. Anybody got a clue? By the way, I think I can get used to this forum. Its fun. I recently joined a bmw forum and got alot of answers from the real world people.
    Please help me pppppppppppplease?
    Signed
    Garysquest
     
  2. Jan 11, 2010 at 5:44 PM
    #2
    offroadTRD

    offroadTRD Well-Known Member

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    Fabtech 3" adjustable coil-over system, Alcan 8-leaf spring pack, Fabtech 3" body lift.
    thermostat.... only thing left
     
  3. Jan 11, 2010 at 5:50 PM
    #3
    MTgirl

    MTgirl too many frogs, not enough princes... Moderator

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    x2 on the thermostat. the in-cabin heat pulls excess heat from the engine compartment first (helping to keep the temp gauge down) before generating its own.
     
  4. Jan 11, 2010 at 5:54 PM
    #4
    HondaGM

    HondaGM Roll Tide

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    check the t-stat or maybe a clogged radiator
     
  5. Jan 11, 2010 at 6:02 PM
    #5
    BakoTruck

    BakoTruck Well-Known Member

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    Yeah I would suggest a bad thermostat or you have a air bubble in the system?
     
  6. Jan 11, 2010 at 6:30 PM
    #6
    SkyHighTacoma

    SkyHighTacoma Josh

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    thermostat? flush the radiator?
     
  7. Jan 11, 2010 at 8:28 PM
    #7
    kevhogaz

    kevhogaz Low Speed, High Drag

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    I'd say bleed it first, especially if it's V6. T-stat second. Block tester third.

    We rarely ever Taco's in with over heating concerns, so it's probably something simple to find.

    Fellow knuckle-dragger here, glad to see I'm not alone!
     
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