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1999 Grand Marquis keeps overheating after 15 minutes. Upper radiator hose gets hot and very tight. The coolant reservoir also boils over and the heat is blowing out cold air on the inside. Could it be that my heater core has gone bad ? I replaced the intake manifold, thermostat, flushed the radiator, changed fan relays, and replaced the coolant reservoir pressure cap

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Are you sure you burped the air out of the cooling system after making those repairs?

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Posted on Nov 16, 2014


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I have a 2001 mercury grand marquis ls. it overheats when im driving it but don't shows it on the temperature hand ..what is the problem ??

The temperature switch on the side of the upper radiator hose is not working. That is, if the engine is hot. Boiling over - need to check thermostat. Grab on to upper hose (should be hot) than with engine off, grab bottom radiator hose. It also should be same temperature as top. If so, thermostat ok. Electric radiator fan - turn Ac on. Fans should run. No, check fuses & relay. Mechanical fan - with engine off, the blade should be stiff to turn. Easy, replace fan clutch. Usually, low level of water is most common. Wish you well.

Apr 18, 2017 | 2001 Mercury Grand Marquis

1 Answer

Saturn running hot

Yeah that is very possible the most common cause is because there isn't enough coolant in the radiator. If your radiator has a cap directly on it take it off and make sure the radiator is filled to the top of the neck with coolant. If the radiator does not you can remove the upper radiator hose and use a funnel to fill the radiator completely. If the temp gauge goes over 50% ever it's safe to assume you have a cooling issue. I hope getting your radiator properly filled with coolant fixes the issue. If not check for leaks in the water pump hoses etc. Check the thermostat.

Sep 05, 2014 | 2005 Saturn Relay

1 Answer

How do i know the thermostat is going bad in a 1990 grand marquis

If anything, it might be stuck partially open. If it were stuck fully closed, the car would really overheat, like boiling hot. You might try taking the radiator cap off when it is cooled down enough, and start the car and wait till it has reached normal operating temperature, so the thermostat should be fully open. Now momentarily squeeze the upper radiator hose together as tight as you can, trying to stop the flow. Look into the radiator and see if you notice a surge of coolant when you let the hose go. If the thermostat is open you should feel the coolant surge when you let your hand go of the hose, and see the coolant coming into the radiator. Just kind of a rough test. If you aren't sure, a new thermostat is always a good idea.

Jun 17, 2012 | 1990 Mercury Grand Marquis

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Replaced intake manifold. Now cannot get water/coolant into the radiator. How?

Rasie front of car on hill and jack stands. This will help purge air trapped in system. Leave radiator cap loose, cold engine. Run engine until upper hose is hot and burps air. Shut down, as it cools keep the radiator and reservoir full. Tighten cap and it should **** from reservoir as it cools.

Jun 21, 2011 | 1995 Mercury Grand Marquis

1 Answer

No heat or air barely enough to keep front windshield defrosted

If engine temp is not at normal, change thermostat. If it is, check for trapped air in system.
with cold engine, loosen radiator cap & stART ENGINE, RUN TILL UPPER HOSE GETS HOT (meaning thermostat has opened), then see if air burps out of cap. Shut off engine and keep rad full as engine cools down.thighten cap & keep reservoir full.

Did upper hose get hot?

Jan 20, 2011 | 2003 Mercury Grand Marquis

1 Answer

1995 Volvo 850 Overheating

head gasket is blown

Apr 26, 2010 | 1995 Volvo 850

1 Answer

Coolant leak from upper radiator hose where it meets engine

thermistate housing is the place you refer to it fuction is to hold a thermastate to open and close water flow at 150 to 190 degree according to car spectif the thermaste sticks it causes overheating and can blow the thermastate gasget, the tole cost is about 30$ at most for the thermastate and many other things can cause a car to over heat and cause a hose leak and somtimes it is simple to just tighten the hiose clamp at the thrmastate and problem sovled see a water leak causes the radiator to lose presure and thus with out a sealed tight water cooling system the boiling point of water is lower and thus the car over heats when in doubt stop by the local gas station and have a tech take a quick look as it could be simple as the hose clamp difficult as a therm,astate but do not let it go to warp a head gasket as this blown headgasket is what is the end results of running a car to hot

Jul 03, 2009 | 1999 Mercury Grand Marquis

2 Answers

Overheating,reserve coolant tank boiling I have a 2000 Ford Taurus with the similar problem. I had my water pump replaced then this started.

Ford 2000 Taurus

To solve the problem you have the things to do in this order;

) When the engine is cold top off the radiator with fluid. (When the pump was replaced the fluid should have been also)
) Make sure the radiator fluid has anti-freeze in it. This is also anti boil also !
) Add fluid to the overflow reservoir.
) Make sure the drive belt was replaced on the water pump.
) With the engine running, you can add fluid to the radiator for the first minute or so. You want to get air pockets out.
) Replace radiator cap.
) Let car warm up. When it's hot you should get the radiator fan coming on.
) When it get hotter the air-conditioning fan may come on.
) If the fan does not come on, the heat sensor is probably bad.
) If all fans come on, and it overheats, you may have a bad thermostat. Trace the upper radiator hose to where it connects to the engine. That's where it located.

Do not operate the engine when it overheats, You will damage the head gaskets and cause radiator fluid to leak into the cylinders.
If you smell radiator fluid in the exhaust fumes, it may already be leaking.

May 07, 2009 | 2000 Ford Taurus

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