my car is overheating and i dont have aleak and coolant is full

Asked by Nov 15, 2014 at 02:34 AM about the Mercury Grand Marquis

Question type: Maintenance & Repair

the temp gauge is on cold then rise to normal range it also goes to the high end of the normal range. it wont cool off turning the heat on high temp,nor does it cool off because i try to cool it down this way turn off the heat and it goes to normal and heats back up

5 Answers

flush the system real good and change thermostat. thats the cheapest way to rule out a clog or thermostat sticking. bout 10 bucks.

3 of 3 people found this helpful.

may be air trapped in the coolant system, had that problem. for me flushing and bleeding it worked. I left the coolant cap off topped it to the cold line, started the engine waited untill thermostat opened and drawn in the coolant and topped off as it took it in. threw the cap back on turned it off. and test drive it watch the needle closely for overheating or not at all. park let it cool top it off again, should do it.


Have the exhaust system checked for a restriction. This can be checked with a vacuum guage. I've had a similar problem with a catalyst converter being restricted on my vehicle.

3 of 3 people found this helpful.

I have a 2005 Mercury Grand Marquis smells like the catalytic converter is clogged and it also seem 2 Tremble When I mash the accelerator and then my gauge to act funny as well goin cold and hot I have a weird burn exhaust smell nd in reverse the exhaust treble nd da motor it not properly breathing so all honesty it's best to get da direct fit full system h pipe all v8 deserve one it increases horsepower and it anotherthing dnt neglect ya exhaust it cause thermostat nd radiator failure nd that y ya coolant drain tryna cool it down from da heat build up repair front cats and go h pipe straight pipe ne call Ford for ya upper steering shaft recall give ya vin num nd see if ya car need to get properly fix before it completely detach it self from in the steering wheel year 05 and yu basically the new box shape steering wheels

I've changed the radiator, water pump, and thermostat on my 1998 Mercury grand Marquis and the gauge still going up telling me the car hot

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,217 nationwide Grand Marquis listings starting at $1,900.


Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
  • #2
  • #3
View All

Related Models For Sale

Used Lincoln Town Car
24 Great Deals out of 1,432 listings starting at $1,850
Used Ford Crown Victoria
4 Great Deals out of 917 listings starting at $1,999
Used Chevrolet Impala
363 Great Deals out of 27,127 listings starting at $1,000
Used Dodge Charger
240 Great Deals out of 32,992 listings starting at $495
Used Cadillac DTS
21 Great Deals out of 1,365 listings starting at $2,595
Used Ford F-150
2,486 Great Deals out of 219,880 listings starting at $1,222
Used Mercury Marauder
27 listings
Used Ford Mustang
278 Great Deals out of 38,263 listings starting at $1,995
Used Chevrolet Tahoe
625 Great Deals out of 37,366 listings starting at $795
Used Honda Accord
539 Great Deals out of 91,748 listings starting at $1,495
Used Chrysler 300
305 Great Deals out of 18,997 listings starting at $1,999
Used Cadillac DeVille
1,245 listings starting at $2,499
Used Chevrolet Caprice
3 Great Deals out of 131 listings starting at $1,350
Used Chevrolet Silverado 1500
2,171 Great Deals out of 149,980 listings starting at $1,499
Used Ford Taurus
147 Great Deals out of 15,463 listings starting at $1,900

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.