Question about 1992 Mercury Grand Marquis

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How to change heater plug on a 1991 Grand Marquis

When turn on the heater it only blows air, not hot air.

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  • lillianramos Feb 02, 2009

    No its not a diesel. It is a V8 engine, regular unleaded gas. Thanks for the question.

  • James Tepfenhart
    James Tepfenhart May 11, 2010

    is this a diesel?


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  • 319 Answers

Why are you asking to replace the heater plugs, what are you talking about. Diesles have glow plugs that heat the engine first. can you explain what it is you want better

Posted on Feb 02, 2009

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1 Answer

Who knows where is the block heater plug in at 1991 Grand Marquis

If your car has one installed already, the plug will be coming out of the grill in the front of the car or hanging down just inside the grill. If you need to purchase and install one, they are for sale at most online automotive retailers and many Auto Zone and O'Reilly's

Dec 16, 2014 | 1991 Mercury Grand Marquis

2 Answers

My air condition only blows out cold air not hot

Turn your air conditioner OFF and turn your heater ON. Air conditioners were designed to blow out one temperature of air... COLD.

Nov 13, 2014 | 2004 Mercury Grand Marquis

1 Answer

Heater blows, but does'nt get hot

Heater core! Check for air in the cooling system. If air is trapped in the heater core, then it will not get hot.

Dec 09, 2013 | 1998 Mercury Grand Marquis

1 Answer

Air is blowing cold when heater is on

Most likely the water is not flowing through the heater core. When the engine is warm, grab the heater hoses and see if they are equally hot. If one side is cold, then the water flow valve is not opening.

If both hoses are hot, the problem is under your dash with the air flaps. Something is not opening to route the air around the heater core.

Dec 05, 2013 | 1996 Mercury Grand Marquis

1 Answer

I replace the heater core in my 1990 Grand Marquis and the air is not blowing hot but it IS slighlty warmer. What can be the problem?

Is the air temperature control blend door working correctly check that and then also check to see if the cars engine is reaching proper temperature, you may have a stuck open thermostat.

Oct 30, 2012 | 1990 Mercury Grand Marquis

1 Answer

Heater core 1991 grand marquis

This may be one of those where the entire dash has to come out to do the heater core.
But you only want to replace the core if it is plugged, or leaking. There is an easy way to tell if it is plugged: with the engine at normal operating temperature, and the control valve open so coolant will circulate, now feel both heater hoses. If core is blocked, only one hose will be hot. If core is circulating correctly, both hoses will be hot. If they are, you don't need to change out the core. One of your vacuum actuated doors is the problem, the blend door that lets air from the blower motor pass over and around the heater core.

May 21, 2017 | 1991 Mercury Grand Marquis

2 Answers

Cannot get the heater to work


Nov 05, 2011 | 1996 Mercury Grand Marquis

1 Answer

The heater in our car is not blowing hot air. It

Check the heater hoses under the hood first to see if they are hot. if they are, there is a temperature control actuator on the top of the heater box. the motors go bad, and the temp door does not move. The motor is hard to get to but if you open the glove box it is to the left, almost behind the radio.

Oct 16, 2009 | 1998 Mercury Grand Marquis

1 Answer

1998 grand marquis hot air. no cool air

try this - turn on the a/c. Disconnect the 2pin wiring connector from the a/c accumulator Small tank, looks like a thermos bottle.
Using a iwre or paper clip, jumper between the 2 pins in the connector. If the compressor clutch clicks and engages, it means you are low on freon.

Apr 04, 2009 | 1998 Mercury Grand Marquis

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