97 deville overheating??
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Northstar Engines and System Technical Discussion Discussion, 97 deville overheating?? in Cadillac Engine Discussion; Hi my name is frank and I just purchased a 1997 Deville base sedan 150k, this is my situation with ...
  1. #1
    oldschool409 is offline Cadillac Owners Member
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    97 deville overheating??

    Hi my name is frank and I just purchased a 1997 Deville base sedan 150k, this is my situation with my car when I'm driving the temp goes to 222 fans turn on and its bumped down to 217-213 then when I start driving or idling in town it starts climbing back to 217, 219,220,222 then back down again. When I get on the freeway entrance and I start to accelerate the temp seems to go up a few degrees(temp starts out at 217 goes up to 222). When I get on the freeway and the engine temp is 222 it doesn't go any further, it starts to drop to about 196 -190 188 in about a minute or two of driving and stays there. On the freeway if I floor the car on the freeway the temp doesn't go up it actually makes the temp go down more. I put a bottle on the overflow hose and theres no water being blown out its dry... I replaced the water pump belt because it looked wet and damaged it was falling apart I didn't notice and leaks around the water pump or anywhere else around the engine. Help.


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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 97 deville overheating??

    The thermostat is set to begin opening at 188 and be fully open at 206. The car should run at 193 - 198 all day long on the highway with a slight temp rise just after an aggressive passing maneuver or other heavy acceleration, then it comes back to ~196 or so. Get off the highway and hit a traffic light, the temp creeps up to 224.

    The fans are set to come on slow at 224 and fast at 236, or slow any time an a/c mode is enabled. The temp creeps up to ~224 in traffic or slow crawl, fans come on and the temp crawls back to ~213. Then back to 196 on the open road.

    Carry the coolant surge tank at half full, COLD. Make sure the (16 # ?) pressure cap is tight.

    Take the car to a GM dealer and have the DEXCOOL changed NOW if you cannot positively document that it has been changed within the past 3 years.

    All normal.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 97 deville overheating??

    Sounds pretty normal to me too. I wouldn't worry unless it starts running hotter. Follow Subs advice and change that coolant.

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  6. #4
    Talamant3z's Avatar
    Talamant3z is offline Cadillac Owners Enthusiast
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    Re: 97 deville overheating??

    yeah dudes its normal it still scares the hell out of me when i see my temp gauge go to 1 o'clock. but it comes back down. just wondering why did gm make the n* like that? i have never been in a car that went past 12 o'clock on the temp gauge. and i used to let my caprice run while i would go somewhere so car would be cold when i got back in i can remember leaving it on for times up to half an hour and no needle movement (plus gas was cheap too haha) i leave my eldo in idle for 10mins it at 224 near the 1 o'clock line

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    Ranger's Avatar
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    Re: 97 deville overheating??

    Every engine fluctuates temperatures. These gauges are just dampened so much so people don't panic. I think every once in a while you might get one that is a bit more sensitive (if that is possible).

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    Talamant3z's Avatar
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    Re: 97 deville overheating??

    Quote Originally Posted by Ranger View Post
    Every engine fluctuates temperatures. These gauges are just dampened so much so people don't panic. I think every once in a while you might get one that is a bit more sensitive (if that is possible).
    well all i can say is it never went past the middle same with my moms intrepid i took it out to the beach about 1 and a half hour drive hit really bad traiffic once i got there and was in stop and go traffic for a good 35mins and the cars needle was under the 12 o'clock didnt hit the middle till i got on the beach. thats the only car i been in where it took alot of idling to get the cars needle to run at the middle. dodge makes some good cars

    but still doesnt beat sitting in a cadillac haha

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    Ranger's Avatar
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    Re: 97 deville overheating??

    Mine is the same. Dead on 12:00 and does not budge. I'm just the opposite though. Makes me wonder if the damned thing works. It's really just a matter of what you are used to. If you had a real one that showed every fluctuation in real time, you'd consider it normal and would not worry about it. You'd know what the "normal" parameters are.

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    Talamant3z's Avatar
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    Re: 97 deville overheating??

    so you think the eldo/sevilles have a sensitive gauge?

  11. #9
    Ranger's Avatar
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    Re: 97 deville overheating??

    No. Maybe "some gauges". Even then I am not 100% sure of that. I only say that because I have heard some people mention some fluctuation and others see none at all. My '02 SLS (now my daughters) sits dead center at 12:00.

  12. #10
    oldschool409 is offline Cadillac Owners Member
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    Re: 97 deville overheating??

    I guess I'm just worried seeing all the other deville 97-99 haveing gasket problems...so if I'm driving around steady the temp reading 222 is normal and then the temp drops to 210 and within a minute of driving its back up to 222 while the car is moving?

  13. #11
    Ranger's Avatar
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    Re: 97 deville overheating??

    Well, I wouldn't call that "normal", but I don't think it is anything to worry about yet. Just keep an eye on it and see if it gets worse.

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