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getting hot with heater hoses connected to heater core...

Discussion in 'The Garage' started by rjfguitar, Oct 31, 2003.

  1. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Last april I pulled off my heater hoses from the fire wall and just put in an splicer to keep the hoses connected. I did this because my heater valve was leaking and staying warm causing the A/C air to warm up as it passed through the heater core, not good in 100 degree cali weather. Today I reconnected the heater hoses to the heater core in the fire wall and immediately afterwards my motor got hot very fast(watched the needle travel in a couple of seconds). I put the splicer back in like it was for the summer and stays and the motor stayed cool like before. I pulled the hose from the intake/stat to the radiator and the water was just trickling out of the hose, I puled the radiator cap and could see the water rushing into the radiator from the heater core hose. I am thinking the thermo stat is closed and the return is flowing through the heater lines and/or the heater core is plugged from being open all summer. what do you guys think? /forums/images/graemlins/thinking.gif
     
  2. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Could the heater core be air bound?
     
  3. khotmer

    khotmer 1/2 ton status

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    or full of stuff clogging it? like a wasp nest?
     
  4. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    [ QUOTE ]
    or full of stuff clogging it? like a wasp nest?

    [/ QUOTE ] Cool,Another Ohio Wheeler /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
     
  5. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    UPDATE: I replaced the thermo stat and blew compressed air through the heater core and it isn't clogged at all. Hooked the hoses back up to the heater core and it still gets hot . I can shut it off for 1 MINUTE and when I start it back up it's at about 180 which is what the stat is set at... NOW IM CONFUSED. oh, and if I disconnect the hoses and put the splicer back it stays right at 180. /forums/images/graemlins/confused.gif /forums/images/graemlins/angryfire.gif
     
  6. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    When you are checking this is the cap on or off? /forums/images/graemlins/thinking.gif
     
  7. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    I had the cap off when I was checking everything and watching the water come in to the radiator from the heater hoses. Put it back on when I test drove it and overheated.
     
  8. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    How high is your water level from the top of the rad.?
     
  9. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    right at the top.
     
  10. BEHJR

    BEHJR 1/2 ton status

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    Check the level of your coolant. Lot more collant required to circulate through the core.

    BH.
     
  11. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Run it until the stat opens then check the water level.leave the heater set to hot with the fan off.It sounds like the water level is going real low when the stat opens
     
  12. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    I've checked te water level a few times, just checked it after I drove and it is at the very top.
     
  13. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Can you see the stat open (water flow)?
     
  14. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Bob,From what it sounds like it might be the stat.Take it out and see if it overheats.If not try a new stat.....
     
  15. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    I posted an update a few posts up... I changed the stat and pulled the return hose with the motor at temp. and water was flowing. I just put the splicer back in and it runs at perfect temp. The cooling system seems to be working properly except when the heater core is added in the loop. I even stuck the old stat in a pan and boiled it, it opened up just like it was supposed to so thats not the problem. Don't really know what to do now. I guess there is something wrong with the heater core or water valve. The core is clear, compressed air ran through no problem. I guess I will just have no heater for now until I figure out the problem. /forums/images/graemlins/frown.gif
     
  16. 99firehawk

    99firehawk 1/2 ton status

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    Try runnign a garden hose through the core back wards, compressed air will go though a plugged core (not to mention I have seen people pop cores doing the compressed air trick)
     
  17. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I would replace the core. They're cheap and easy to replace and it's cheap insurance.
     

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