My 1997 cadillac deville concours is holding to much pressure in the coolant system and causing my idle to run high, it has a new radiator and theremostat once I releive the pressure every time I drive it the idle will go down but I have to do this everyday

Asked by Jun 22, 2017 at 10:16 PM about the 1997 Cadillac DeVille Concours Sedan

Question type: Maintenance & Repair

4 Answers

74,525

Cooling system pressure is not connect to the idle speed. If the pressure is too high the radiator cap may be defective. If the car is running hot you probably need to have the cooling system serviced.

1 of 1 people found this helpful.
74,525

If you have a Northstar engine the head gaskets may be leaking.

98,555

These older Caddies would raise the idle speed up if the sensors detected an overheat trying to move coolant faster through the radiator, and F_O_R is absolutely correct about the cap, it should vent any pressure over it's rating listed on the cap. Replacing the cap would be the quickest way to see if that elemanates the problem, but if it don't then a head gasket test is the next step.

Best Answer Mark helpful
98,555

Thanks for the best answer points, hop it was just the cap.

Your Answer

DeVille

Looking for a Used DeVille in your area?

CarGurus has 21 nationwide DeVille listings and the tools to find you a great deal.

Postal Code:

Cadillac DeVille Experts

  • #1
    kikero
    Reputation
    2,180
  • #2
    Js08016
    Reputation
    1,930
  • #3
    Cynthiasmith
    Reputation
    1,620
View All

Related Models For Sale

Used Lincoln Town Car
12 listings starting at $1,850
Used Chevrolet Impala
72 Great Deals out of 928 listings starting at $1,900
Used Mercedes-Benz S-Class
7 Great Deals out of 150 listings starting at $5,999
Used BMW 7 Series
4 Great Deals out of 158 listings starting at $7,500
Used Lincoln Continental
58 listings starting at $61,617
Used Ford Mustang
11 Great Deals out of 1,172 listings starting at $2,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.