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heat in my 94 trans am

This is a discussion on heat in my 94 trans am within the General Help forums, part of the LSx Technical Help Section category; ive got a 94 trans am. thwe problem is that the heat in the car doesn't work well. it works ...

  1. #1
    Junior Member northslider's Avatar
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    99 firehawk 94 25th anni

    heat in my 94 trans am

    ive got a 94 trans am. thwe problem is that the heat in the car doesn't work well. it works for 15 seconds then goes cold agian. i just replaed the new thermostat with another new thermostat (both 180) fans come on at 195 degrees. is the heatewr core clogged.or what?? anyone else have this issue. ???????

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    cutting and welding mark21742's Avatar
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    I'd try unhooking both heater lines and hookup a garden hose to one of then to see how it flows... Sounds like your heatercore is clogged but try the garden hose 1st to be sure

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    Senior Member bigrondownhiller's Avatar
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    Just like mark said try flushing the heater core.

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    Junior Member northslider's Avatar
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    99 firehawk 94 25th anni

    will try thanks

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    Member JRENIGAR's Avatar
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    friend of mine had this problem, turned out to be a bad radiator cap. They said the mech that found the problem said the cap didnt hold enought press to force the antifreeze through the heater core, ????? Worked for them??? IDK???? Try it. Lemme know how it works for ya.

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    Veteran 0rion's Avatar
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    most likely a blocked heater core....back flush it and see what happens.

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    Junior Member northslider's Avatar
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    Quote Originally Posted by JRENIGAR View Post
    friend of mine had this problem, turned out to be a bad radiator cap. They said the mech that found the problem said the cap didnt hold enought press to force the antifreeze through the heater core, ????? Worked for them??? IDK???? Try it. Lemme know how it works for ya.
    i have done this and didnt help. but good info. the cap ive got hold 15psi (tested)

  8. #8
    Junior Member northslider's Avatar
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    99 firehawk 94 25th anni

    Quote Originally Posted by 0rion View Post
    most likely a blocked heater core....back flush it and see what happens.
    working on flushing it. i live on nellis afb in lodging and dont have access to a hose (i know its silly) soon as i can i'll flush it out. right now ive got that "coolant flush" made by prestone that you poor in the system and drive it around for a week or so and then drain the system. hoped it'll work.

  9. #9
    Member JRENIGAR's Avatar
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    I tried that crap in my old car and it did nothing for the radiator. I could still see corosion built up on the core tubes from the filler neck. I ran mine about 500 miles on the interstate too so if thats not enough then I dont know what is???

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