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Thread: over heating

  1. #1
    zx600 is offline Cadillac Owners Member
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    over heating

    New here so I hope I am in the right area. I just purchased a 98 deville and after 45 min. of idle it will overheat. the radiator is still cool but the hoses going to it are hot as can be. I am a heavy equipment mechanic and know most things but this cooling system is a bit odd with the way all the hoses are routed. Just want to confirm that the radiator is more than likely plugged up. Did a compression test on this motor and got 130 on 5,7,6,8 and 110 to 115 on 1,2,3,4 so I wouldnt think a head gasket is blown. On a diesel engine they only want 10% drop between cyl. any help would be great... thanks


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: over heating

    You where in the wrong area. The lounge is for general B.S. discussions. Moved you to the correct forum.

    A HG is a distinct possibility, but before you condemn it, check the purge line. If it is clogged, it will overheat. If the purge line is clear and flows coolant, then do a block test.

  4. #3
    carnut is offline Cadillac Owners Master
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    Re: over heating

    The purge line goes from the holding tank to the water pump. Remove the hose and make sure the nipples the hose goes on are not restricted and the hose is un restricted.

  5. #4
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: over heating

    Quote Originally Posted by zx600 View Post
    New here so I hope I am in the right area. I just purchased a 98 deville and after 45 min. of idle it will overheat. the radiator is still cool but the hoses going to it are hot as can be. I am a heavy equipment mechanic and know most things but this cooling system is a bit odd with the way all the hoses are routed. Just want to confirm that the radiator is more than likely plugged up. Did a compression test on this motor and got 130 on 5,7,6,8 and 110 to 115 on 1,2,3,4 so I wouldnt think a head gasket is blown. On a diesel engine they only want 10% drop between cyl. any help would be great... thanks
    -------------------------------
    I just purchased a 98 deville and after 45 min. of idle it will overheat
    why would you sit at idle for 45 minutes?

    did the electric fans come on -

    how hot do you consider overheating -

    what is the temp while driving -

    -------------------

    like carnut already suggested - check the PURGE LINE -
    there should be a constant gentle flow from the engine to the SERGE TANK -
    this is the ONLY way to eliminate air from the cooling system -

  6. #5
    stoveguyy is offline Cadillac Owners Connoisseur
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    Does car boil over? Spew coolant?


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