thermostat is stuck closed

Asked by GuruKKHKW Dec 13, 2019 at 12:04 AM about the 1998 Cadillac DeVille

Question type: Maintenance & Repair

Overheating and still coolant in resivor. Do I have to
change the waterpump

2 Answers
26,865

taver91 answered 5 years ago

If you know your thermostat is stuck closed wouldn't you first change it out and see what happens? The water pump provides the circulation of the coolant through the engine, heater and radiator. If it was bad you would see no obvious flow in the radiator neck but, the thermostat would need to be open.

2 people found this helpful.
Mark helpful
157,875

James answered 5 years ago

Before putting a lot of money in this vehicle have the coolant tested for combustion gases. Northstar engines are notorious for blowing head gaskets and if you have combustion gases in the coolant you have a blown head gasket and the vehicle is not worth fixing. Hope that helps! Jim

Mark helpful

Your Answer:

Related Questions

  • Do I have to replace the water pump if the thermostat is stuck closed 2 Answers

    Do I have to replace the water pump if the thermostat is stuck closed

    1998 Cadillac DeVille Sedan FWD

    -

    Maintenance & Repair

  • thermostat is stuck closed 2 Answers

    Overheating and still coolant in resivor. Do I have to change the waterpump

    1998 Cadillac DeVille

    -

    Maintenance & Repair

  • Thermostat 2 Answers

    Can I run my 4.6 deville 05 without a thermostat?

    2005 Cadillac DeVille Sedan FWD

    -

    Maintenance & Repair

  • key stuck and ignition switch 1 Answer

    Key is stuck in the ignition switch have to unplug battery to stop car from running. Put new starter in now have to bump starter to have car to start

    1991 Cadillac DeVille Sedan FWD

    -

    Maintenance & Repair

  • 2003 Cadillac Deville Overheating Fixed Rad/thermostat 3 Answers

    I paid 900 bucks for a new rad and thermostat today.Car is overheating still.Fan is working.Engine oil is very clean.Engine sounds perfect.120,000 miles what else could it be? Please help

    2003 Cadillac DeVille Sedan FWD

    -

    Maintenance & Repair

DeVille

Looking for a Used DeVille in your area?

CarGurus has 6 nationwide DeVille listings and the tools to find you a great deal.

Postal Code:

Shortcuts

Search Cadillac DeVille Questions

CarGurus Experts

  • #1
    James Sparrow
    Reputation
    4,090
  • #2
    tuff4x4
    Reputation
    3,110
  • #3
    Cynthiasmith
    Reputation
    2,840
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Cadillac Eldorado
4 listings
Used Cadillac Seville
1 listing
Used Cadillac Escalade
16 Great Deals out of 429 listings starting at $9,995
Used Chevrolet Corvette
27 Great Deals out of 1,082 listings starting at $15,000
Used Lincoln Continental
8 listings starting at $17,900
Used GMC Sierra 1500
128 Great Deals out of 6,516 listings starting at $3,975

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. Content will be removed if CarGurus becomes aware that it violates our policies.