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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Posted on Jan 02, 2017

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To troubleshoot this types of problem,click the link below :---
Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html

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Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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This will help.Thanks.

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1 Answer

Air works great but no heat just blows cold air


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---------A/C, heater, defroster fan, not working?http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html
--------Heater problem?http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html
---------Engine Overheats and heater blowing cold?http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
-----------Heat blows cold on drivers side and hot on passenger side?http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html----------------This will help.Thanks.

Sep 05, 2011 | 2007 Suzuki SX4

1 Answer

Hot air blows but cools down in 15-20 seconds.


You likely have a restriction in the heater coolant hose circuit - perhaps a coolant control valve not fully opening, or a kinked hose.
Insufficient coolant volume is flowing to keep the heater core hot.
Try back flushing the heater core system with a garden hose to check flow.

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