Coolant temperature question
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Coolant temperature question in Past Cadillac Vehicle Discussion; I'm not trying to get this coolant thing all fired up again as many post are somehow related to overheating ...
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    Goldencletus is offline Cadillac Owners Fanatic
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    Coolant temperature question

    I'm not trying to get this coolant thing all fired up again as many post are somehow related to overheating issues. I just want to know if what my car is doing is normal or if I need to chase this further. My car runs under normal ambient temps (70-90 degrees) with the A/C on at freeway speeds anywhere between 192 and 200 degrees coolant temp. The question I have is, as soon as I start up hills or the ambient temp starts to climb, the coolant temp climbs to the high 220's to 230. It does not use any coolant and comes right back down to it's normal operating range as soon as the hill has been crested or the outside temp is below 90. I had the coolant flushed and checked the purge line for blockage and all seems well. Is this normal or is the T-stat headed south?

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    blalockchiro's Avatar
    blalockchiro is offline Cadillac Owners Fanatic
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    welcome, what type of caddy? engine? have u pulled any codes from the car? dont know how go to the top of page at sticky and learn how, very easy. if u have any, list them with descrip. normal temp for north * is 190-220, if it goes down rapidly...dont worry

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    Goldencletus is offline Cadillac Owners Fanatic
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    Re: Coolant temperature question

    1998 Deville Concours, N* of course!

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    blalockchiro's Avatar
    blalockchiro is offline Cadillac Owners Fanatic
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    ok i have the same except 97

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    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Codes are irrelevant.

    Your temps are perfectly normal. The cooling fans don't go to low speed operation until 224 degrees, high speed until 236 degrees.

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Coolant temperature question

    Generally speaking, temp increase on a hill climb is not a good sign, BUT if you are not going over 230, I wouldn't worry. If it starts going higher, then worry.

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    bmconway76110 is offline Cadillac Owners Member
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    I think it depends on the hill as well. My recent trip from Reno to Denver took me through Salt Lake City. On the east side of town on highway 80 there is a long climb up a steep incline. My temp climbed up because the tranny dropped to third gear. As soon as I crested the hill it came back down. If anyone drives highway 80 near Salt Lake you know the climb I am talking about. I wouldn't worry to much about it.

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    Goldencletus is offline Cadillac Owners Fanatic
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    Re: Coolant temperature question

    Thanks everyone! I used to live in Park City, Ut. I know the climb very well! The temp seems to vary less since the coolant flush and less increase in temp. The highest I've seen now is 226 on the steep hill I travel every day (and it was 105 degrees outside!).

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Coolant temperature question

    ........... and you might want to check and carefully clean out the AC condenser in front of the radiator - bugs and crap in the fins can seriously hinder proper airflow and cooling. Use caution with water/hose around the cooling fans (they don't run at over 35 mph anyway).

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    bmconway76110 is offline Cadillac Owners Member
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    I think your probably fine. I had the same concern when I first got my 2005 DTS. I came out of a Caliber with a 2.0 4 banger. The N* engines are big beasts and the do produce some heat.

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    Re: Coolant temperature question

    Please read the sticky posts in the Engines, Northstar Performance forum concerning cooling systems and temperature gauges. Then go way up ^^^ to the top black bar and study the Cadillac Technical Archive.

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    The Donald is offline Cadillac Owners Fanatic
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    Re: Coolant temperature question

    I've never owned a car that temp didnt go up while climbing a grade then go down on the down side. Engine works harder going up and less coming down. comman sense tells you that.

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    Submariner409's Avatar
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    Re: Coolant temperature question

    Quote Originally Posted by bmconway76110 View Post
    I think your probably fine. I had the same concern when I first got my 2005 DTS. I came out of a Caliber with a 2.0 4 banger. The N* engines are big beasts and the do produce some heat.
    The 280.7 c.i. Northstar is a LITTLE V-8 and it produces no more or less heat than an Olds 455 or a Cadillac 472 or even some of the 500+ c.i. stump pullers.

    FWIW, the Northstar is a tad smaller than a 1963 Chevy 283.

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