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

88,845

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.

42,045

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

Add photo

Related Questions

  • Still Overheating 4 answers

    When we shut the motor off you could hear the fan roar like a bad bearing, haven't had AC for a couple of years...so we replaced the fan assembly, hoses, new water pump & 190 thermostat....still overh...

    2004 Mercury Grand Marquis

    -

    Maintenance & Repair

  • 88 grand marquis overheating and leaking water 10 answers

    My 88 mercury grand marquis is overheating and leaking water from the passenger side under the car around the front passenger side door. What is the problem I can't figure this out? Please help

    1988 Mercury Grand Marquis

    -

    Maintenance & Repair

  • 2003 mercury grand marquis overheating, after replacing fan and thermostat 12 answers

    My 2003 mercury grand marquis is overheating, even after replacing the fan and thermostat. There does not appear to be any problem with the water pump. I can drive it all day at hiway speeds, but ...

    2003 Mercury Grand Marquis LSE

    -

    Maintenance & Repair

  • How to fix overheated cylinder on a grand marquis 1 answer

    2004 Mercury Grand Marquis

    -

    Maintenance & Repair

  • 2002 Mercury Cougar v6 is overheating 1 answer

    My car is overheating and idk what's wrong. I can't find any coolant in the oil, and I have replaced the temperature coolant sensor, engine temp sensor, water pump, thermostat, and radiator. I do...

    2002 Mercury Cougar 2 Dr V6 Hatchback

    -

    Maintenance & Repair

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,260
#2 kbro
kbro
Reputation 2,050
#3 Js08016
Js08016
Reputation 1,660
View All

Related Models For Sale

Used Ford Crown Victoria
8 Great Deals out of 973 listings starting at $2,990
Used Lincoln Town Car
30 Great Deals out of 1,818 listings starting at $1,650
Used Chevrolet Impala
588 Great Deals out of 29,014 listings starting at $1,300
Used Mercury Marauder
30 listings starting at $10,000
Used Ford Taurus
202 Great Deals out of 19,359 listings starting at $500
Used Chevrolet Tahoe
631 Great Deals out of 27,863 listings starting at $600
Used Cadillac DeVille
9 Great Deals out of 1,590 listings starting at $1,995
Used Honda Accord
718 Great Deals out of 83,073 listings starting at $500
Used Ford Mustang
329 Great Deals out of 45,942 listings starting at $2,000
Used Ford F-150
2,425 Great Deals out of 211,459 listings starting at $895

Used Cars For Sale

2008 Mercury Grand Marquis GS For Sale
44 listings starting at $3,995
2007 Mercury Grand Marquis GS For Sale
47 listings starting at $3,500