97 Deville overheating question
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 97 Deville overheating question in Past Cadillac Vehicle Discussion; OK so I have a 97 DeVille with the 4.6. I have changed the thermostat and checked the cooling fans ...
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    interceptorghost01 is offline Cadillac Owners Member
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    97 Deville overheating question

    OK so I have a 97 DeVille with the 4.6. I have changed the thermostat and checked the cooling fans and they both come on when they are supposed to. The water pump isn't leaking or making any noise ether. Now. I noticed that there is water leaking into the passenger side floor board. And the heat just barely works. Could the heater core be the reason for why its overheating?

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    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    The heater core is definitely leaking, but that won't cause overheating until the coolant level gets low.

    Under what conditions is it overheating?

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    interceptorghost01 is offline Cadillac Owners Member
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    Re: 97 deville overheating question

    Thanks for the quickreply! And to my understanding its at random. But sometimes it doesntoverheat at all. i'll find out more and let you know.

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    MoistCabbage's Avatar
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    Have read anything on checking the purge line? If not, do a search.

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    interceptorghost01 is offline Cadillac Owners Member
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    Re: 97 deville overheating question

    OK so I checked the purge line and there is no coolant coming out at all. So I took the line off and fed a thick wire down in the metal part by the throttlebody and jimmied it around real good. Then I started it again and still no coolant coming out. Water pump not working maybe?

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    Caddy-EaRL's Avatar
    Caddy-EaRL is offline Cadillac Owners Fanatic
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    Did you clear the hollow bolt that it connects to over by the water pump/thermostat as well as clear the whole line itself?. Water pumps rarely stop pumping. Odds are between very slim and none.

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    Re: 97 Deville overheating question



    If the belt is on, the tensioner is not frozen and the pump is spinning, it's not broken. I agree with Earl, my money is on the hollow bolt that the purge line is attached to. That is almost ALWAYS where the clog is.

    To prevent it in the future, DO NOT use the sealant tabs aka cooling system supplement.

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    interceptorghost01 is offline Cadillac Owners Member
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    Re: 97 Deville overheating question

    Yes I did clear the line. I can blow through it with ease. Althoe I haven't checked the screw. I'll try and find it and see if its clogged in the morning. I'll let you all know what I find out. Thanks for all your help guys. BTW can anyone direct me to a write up on how to change the heater core? Whoever owned the car last was too lazy to change it and bypassed it instead.

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    Submariner409's Avatar
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    Re: 97 Deville overheating question

    Did the '97 still have the coolant heated throttlebody - using coolant circulating in the purge system ? If so, the TB passage could also be clogged.

    Those systems can be bypassed with a proper sized length of fuel line (reinforced rubber fuel line) which will take the system pressure. Run it neatly from the hollow bolt/nipple at the water crossover to the nipple on the surge tank. Clamp.

    Here's the hollow bolt you're looking for ............ (this is for a 2000 or later engine - the EGR is different from yours .......)

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    Re: 97 Deville overheating question

    Here's an earlier heated throttlebody.

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    interceptorghost01 is offline Cadillac Owners Member
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    Re: 97 Deville overheating question

    Yes mine is the heated tb

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    Re: 97 Deville overheating question

    OK.............. You need to check the hollow bolt for coolant flow as well as the TB passages. If the little hoses, TB passages, or hollow bolt are plugged the system cannot purge itself of air and gases so the water pump cavitates (pumps little or no coolant) and the engine occasionally overheats.

    Using spare pieces of fuel line or rubber tubing, see if you can easily blow through the TB circuit. If not, bypass it: it's not needed - the coolant flow through the water crossover is sufficient to prevent TB bore icing during high humidity conditions (fall and spring mornings and evenings).

    Simply run a proper ID length of fuel line (any parts store) - take your existing purge line for reference - from the hollow bolt to the surge tank nipple - neatly and no crimps. You might need a small wire tie here and there to keep things neat and out of the way of pulleys and such.

    This is a 2000 deville, but you get the idea .............

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    Re: 97 Deville overheating question

    98 Heated also. Not sure what year it switched.

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    interceptorghost01 is offline Cadillac Owners Member
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    Re: 97 Deville overheating question

    Alright guys I figured it out. The clog ended up being the port the coolant comes out of right under the front drivers side motor mount. I took the hose off and ran a piece of weedeater string back up in it and the coolant is flowing through the purge line perfectly now. And I started it and let it run forever. And its not overheating a bit now. Thanks so much for all your help guys I would have never figured it out without your advice.

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    Submariner409's Avatar
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    Re: 97 Deville overheating question

    No "motor mount" on the "front driver's side" - there is a lifting strap - the black U-thing attached to the water crossover ???

    Picture ??

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