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Heads, Motor or Gasket.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CTBlaz45, Jul 29, 2003.

  1. CTBlaz45

    CTBlaz45 Registered Member

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    My Blazer is spewing coolant out of the overflow bottle. I theink it is being caused by a bad head or head gasket. If it is the head I think I will just replace the motor with hopefully a crate motor. If I can afford one. I am looking for crate moter sugestions basicly stockish for an 89 Tbi 350 but maybe better then plain stock. As the cooling sytem overflows into the bottle it is being replaced by air. So i feel it is a head problem. /forums/images/graemlins/k5.gif
     
  2. Tybee

    Tybee 1/2 ton status

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    My 6.2 did the same thing, it had a broken head bolt.
     
  3. CTBlaz45

    CTBlaz45 Registered Member

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    Thst would not be too bad bolts are cheap.
     
  4. Tybee

    Tybee 1/2 ton status

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    You have to figure out which side is causing it.
     
  5. BigBadJap

    BigBadJap Registered Member

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    I had a nissan truck that did that EXACT thing. Dealership told me it was a toasted headgasket; so I replaced it for $600 , and it didn't fix the problem.

    The problem turned out to be a bad $8 thermostat; man was I pissed.

    I'd start with the thermostat, it's cheap and easy to replace. Also, keep an eye on your water pump. If you run low/out of coolant, it doesn't take long for the water pump to burn up.

    Good luck.
     
  6. CTBlaz45

    CTBlaz45 Registered Member

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    I did replace the thermestat did not help
     
  7. BigBadJap

    BigBadJap Registered Member

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    Do you think it could be something like a plugged coolant passage, bad water pump.

    Might be best to take it to a shop and eliminate the guess work.
     

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