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heat doesnt work!

Discussion in 'The Garage' started by blazin83, Nov 14, 2006.

  1. blazin83

    blazin83 Registered Member

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    i dont know what it is! the blower works and everything, it spits out luke warm air but it never gets hot enough to warm the truck.. i have been over the whole system a thousand times and cant find a thing.

    help a cold blazer brother out

    thanks
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    something is not opening or closing all the way , you got cold outside air mixing with heater core air . I would look at all the doors , vacuum lines , and cables attached under the dash .

    Is your truck heat only , or a/c ? I have one of both from 1983 .
     
  3. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    is your coolant full?
     
  4. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Thats the other thing there too , or the thermostat is stuck open and can't heat exchange .
     
  5. stevos67k20

    stevos67k20 1/2 ton status

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    you probably have plugged lines. if itsnot that. then you heater core is plugged and needs to be replaced, i dont know if you can clean it. my heater on my 67 with a big block works amazing, my engine runs at about 200 degrees and my lines come from my water pump and engine block. you can kinda see them here:
    [​IMG]
     
  6. Avery4jc

    Avery4jc 1 ton status Premium Member GMOTM Winner

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    my heater just started working the other day when I cleaned the contacts on my switch in the cab....this is a sort of a hijack but how does the heater in these trucks work? Nothing detailed but just a quick over-view....I'd appreciate it.

    -Avery
     
  7. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    i don't know much, but the climate control in my 83 is set up such that when you move a lever, it adjusts the vacuum hoses on the back of the unit. this must open/close the valve which would allow the coolant to flow thru the heater core.
     
  8. Avery4jc

    Avery4jc 1 ton status Premium Member GMOTM Winner

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    so when the AC is on it allows the coolant to run through the air box and cool off the air that is being blown by via the blower motor...when you put it to heat it just heats the air up from what? The radiant heat off of the engine?

    -Avery
     
  9. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    I'm almost positive that the coolant is ALWAYS running through the heater core, at least in our rigs.
     
  10. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    On both the 83's I have had here , one a/c . one non a/c , coolant always flows through the heater core , always .

    The vacuum and levers on the switches open and close the various doors .
     
  11. Avery4jc

    Avery4jc 1 ton status Premium Member GMOTM Winner

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    Hmm, so if the coolant is always running through then why isn't it cold?
    Or is it just negligible b/c the heat from the engine being brought in when you have the switch on heat?

    -Avery
     
  12. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Because the coolant is gonna be the same temperature everywhere in the system, as in HOT!!!!
     
  13. Avery4jc

    Avery4jc 1 ton status Premium Member GMOTM Winner

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    lol, Jumbo Shrimp...

    -A
     
  14. NoReGrEtS

    NoReGrEtS 1/2 ton status

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    yep
     

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