Still Overheating

Asked by Aug 09, 2016 at 09:04 PM about the 2004 Mercury Grand Marquis

Question type: Maintenance & Repair

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 overheat at high temps i.e. 90-95+ degrees outside, in traffic, once you get going the fan kicks on & the gauge fluctuates then comes back down...changed thermostat to a 180...still doing it....jacked car up, removed reservoir cap & let engine run thinking there was a air void....still smelling coolant, don't see any leaks. Put regular coolant in (green), but read somewhere I needed to use orange??  What's left??  Confused

4 Answers

95

Hi Patricia, have you checked the heater core yet? Start the car idle it until normal operating temperature is reached then check the 2 hoses going in to it. If one is significantly cooler than the other then its probably the heater core.

1 out of 1 people think this is helpful.
95

May also be the water pump. After the engine is cool start the engine, remove the radiator cap and look inside to make sure coolant is flowing. If its not then its probably the pump.

1 out of 1 people think this is helpful.
62,175

You have replaced most of the coolant system,if Katie,s advice as to the heater core being bad or plugged show,s to be ok you might want to check the fan clutch,if not tuning right will cause this issue from heating up.

1,205

Have the radiator removed and cleaned, just to be on the safe side.Throw in a new water pump while you're at it. New hoses too. I always suspect the radiator, when there are problems. the radiator shop will tell you if it was plugged. fan clutch OK?

Your Answer

Add photo

Related Questions

  • Overheating 2 answers

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

    2003 Mercury Grand Marquis GS

    -

    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

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,821 nationwide Grand Marquis listings starting at $500.

ZIP:

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
10 Great Deals out of 976 listings starting at $2,990
Used Lincoln Town Car
28 Great Deals out of 1,823 listings starting at $1,650
Used Chevrolet Impala
593 Great Deals out of 29,130 listings starting at $1,300
Used Chrysler 300
356 Great Deals out of 20,743 listings starting at $1,000
Used Mercury Marauder
29 listings starting at $10,000
Used Ford Taurus
193 Great Deals out of 19,339 listings starting at $500
Used Chevrolet Tahoe
642 Great Deals out of 27,802 listings starting at $600
Used Cadillac DeVille
7 Great Deals out of 1,598 listings starting at $2,000
Used Honda Accord
739 Great Deals out of 82,781 listings starting at $500
Used Ford Mustang
317 Great Deals out of 45,660 listings starting at $2,000
Used Ford F-150
2,462 Great Deals out of 210,791 listings starting at $895
Used Buick LaCrosse
188 Great Deals out of 22,806 listings starting at $1,500

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
5 Great Deals out of 43 listings starting at $3,900
2010 Mercury Grand Marquis For Sale
6 Great Deals out of 95 listings starting at $3,999
2009 Mercury Grand Marquis For Sale
4 Great Deals out of 101 listings starting at $4,299
2008 Mercury Grand Marquis For Sale
7 Great Deals out of 144 listings starting at $500
2007 Mercury Grand Marquis For Sale
3 Great Deals out of 152 listings starting at $1,900