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

83,295

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.

35,235

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

  • 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

  • my car is overheating and i dont have aleak and coolant is full 4 answers

    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 ...

    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

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,040
#2 kbro
kbro
Reputation 2,030
#3 Js08016
Js08016
Reputation 1,580
View All

Related Models For Sale

Used Lincoln Town Car
40 Great Deals out of 2,127 listings starting at $1,995
Used Ford Crown Victoria
5 Great Deals out of 1,395 listings starting at $1,700
Used Chevrolet Impala
936 Great Deals out of 35,377 listings starting at $1,700
Used Mercury Marauder
37 listings starting at $7,998
Used Ford F-150
3,083 Great Deals out of 208,274 listings starting at $1,200
Used Cadillac DeVille
5 Great Deals out of 1,964 listings starting at $1,600
Used Chevrolet Tahoe
887 Great Deals out of 28,086 listings starting at $1,700
Used Buick LeSabre
11 Great Deals out of 2,266 listings starting at $1,299
Used Honda Accord
987 Great Deals out of 75,076 listings starting at $899
Used Toyota Camry
1,212 Great Deals out of 96,014 listings starting at $1,250
Used Chevrolet Camaro
445 Great Deals out of 40,684 listings starting at $3,500

Used Cars For Sale

2008 Mercury Grand Marquis GS For Sale
51 listings starting at $3,450
2007 Mercury Grand Marquis GS For Sale
51 listings starting at $2,995