Question about 1985 Mercury Grand Marquis

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My 1985 mercury marquis is over heating Ive already changed the water pump, thermostat and radiator hoses but it still over heats???? what could cause this?????

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Posted on Jan 02, 2017

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SOURCE: 1999 mercury grand marquis occasionally overheats,

Check the antifreeze for oil, pull your dipstick out, see if antifreeze is in oil or smells sweet or over full, sounds like you may of a bad head gasket. You can also check this by having a compression test done on the cylinders.

Posted on Feb 20, 2011

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SOURCE: 1999 mercury villager is overheating, ive changed

Have it tested for combustion gases in the cooling system. You could have a blown head gasket from all the overheating.

Posted on Aug 15, 2013

Testimonial: "ok i will do that i also noticed that the lower radiator hose is not getting hot, could that be caused by the combustion gases?"

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1 Answer

Have a 2003 Mercury grand marquis is overheating only while driving when trying to shift into overdrive at 45mi/hr then loses power changed water pump belt tensioner what am I missing

Did you change the thermostat, if it is shut or closed the water will not circulate through the engine and cause a over heating problem. To see if the antifreeze is circulating through the engine, start the car and gently remove the radiator cap taking care not to have hot antifreeze burn you, then look and see if the antifreeze is moving through the radiator if it is the thermostat is not stuck shut. and you may have a different problem. Hope this helps.

Nov 07, 2016 | Mercury Cars & Trucks

1 Answer

Vehicle over heats when idling for thirty minutes or driving for an hour or more. The red engine light came the last time. I rev the engine with a pressure meter in the radiator and reading dropped. Does...

one would suggest blown head gasket
check for coolant in radiator
or coolant in engine oil

old hoses
stuck thermostat
cooling fans not coming on or old and slow spinning
faulty thermostatic switch for fans to start
corroded or leaking water pump

May 19, 2016 | 1988 Mercury Grand Marquis

1 Answer

My 1984 grand marquis does not get heat

did everything said to do put new heater core in and a new thermostat instill no heat

Oct 08, 2012 | 1984 Mercury Grand Marquis

1 Answer

Cannot change temperature on heat & air

Temp is controlled by an electric motor(or could be vacuum hose) on the blender door of heater housing. If you find this is operating correctly, then the problem is a plugged heater core.Backflush it by removing both heater hoses and flushing from water pump side toward thermostat side.don-ohio

Oct 23, 2011 | 2000 Mercury Grand Marquis

1 Answer

I have a 96 grand marquis i just changed the radiator and the coolant is not flowing through the hose to the thermostat and the hose at the bottom of the radiator what can i do?

check water pump with car OFF try spinning the fan if spins free check thermstat if not i would say change water pump i would suggest changing them both your looking about 50 bucks for a water pump and about 10 on thermostat (i would get a fail safe, if it breaks it locks open so theres no engine problems)

Aug 23, 2011 | Mercury Grand Marquis Cars & Trucks

1 Answer

Where is the Thermostat in a 1984 Mercury Grand Marquis located? Is it difficult to change? I think it is sticking .

Follow top radiator hose to it

If you have no heat , it is sticking open

They should be changed every 5 or 6 years

Aug 06, 2011 | 1984 Mercury Grand Marquis

1 Answer

No heat. has a new thermostat. engine stays cold .

need to check to see if radiator is circulation the water . hose good make sure their no soft an sucking shut especaily the bottom hose . you can get a temp gauge take radiator cap off ,let warm up til thermostat opens put gauge in radiator see what temp. is . (wife got meat or candy temp gauge this will work) last it could be heater core bad.

Nov 02, 2010 | 1995 Mercury Grand Marquis

1 Answer

No heat in my 98 Grand Marquis

are you shure that you dont have trapped air in the heater core? get a big funnel that will fit tightly in the radiator filler and fill with coolant and run the car to normal operating temp and watch for the level to drop or bubbles to evacuate into the funnel. on really stubborn air locks i have had to squeeze the hoses to pump water through the heater core.

Jan 20, 2009 | 2000 Mercury Grand Marquis

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