Overheating

Asked by Jul 22, 2016 at 05:03 PM about the 2003 Mercury Grand Marquis GS

Question type: Maintenance & Repair

My car overheats when the a/c is on but when i
turn off the a/c is cools back to normal temp

2 Answers

105,485

check the cooling fans for proper operation, they should turn on when the A/C is on, also check for dirt and debris in the cooling fins of both the radiator and heat exchanger out front. If the cooling fans work and you can see through the fins then the most likely culprit is the radiator, it is internally plugged and cannot handle more demand made by the A/C.

55,415

Some of the cooling fans in that era were bad about breaking the ring that holds the blades together. If the cooling fans are making a ticking noise it is time for a new one.

Your Answer

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    5,850
  • #2
    kbro
    Reputation
    2,160
  • #3
    Js08016
    Reputation
    1,930
View All

Related Models For Sale

Used Lincoln Town Car
29 Great Deals out of 1,670 listings starting at $1,099
Used Ford Crown Victoria
938 listings starting at $1,496
Used Chevrolet Impala
576 Great Deals out of 34,503 listings starting at $1,100
Used Ford Mustang
598 Great Deals out of 39,962 listings starting at $1,895
Used Chevrolet Tahoe
828 Great Deals out of 42,144 listings starting at $1,987
Used Ford F-150
3,290 Great Deals out of 224,485 listings starting at $1,200
Used Honda Accord
1,116 Great Deals out of 74,851 listings starting at $1,100
Used Ford Taurus
243 Great Deals out of 15,306 listings starting at $1,800
Used Toyota Camry
1,122 Great Deals out of 87,385 listings starting at $995
Used Lincoln Continental
15 Great Deals out of 3,426 listings starting at $32,794

Used Cars For Sale

2008 Mercury Grand Marquis GS For Sale
43 listings starting at $3,488
2007 Mercury Grand Marquis GS For Sale
4 Great Deals out of 38 listings starting at $2,495

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.