Question about 1996 Mercury Grand Marquis

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1996 Grand Marquis lets off gas smell through A/C vents after about 10 min with A/C on and more so when idle ???

I have been putting some work into my Marquis coolant, sparkplugs, and oil to name a few just got it to drop the check engine light (YES). All I need now is to figure out why my A/C after about 10 mins or so on the road it releases a gas or burnt nail polish smell cant put my finger on it exactly. looked for leaks couldn't notice anything does any one have any idea as to my first step to remedy this problem? please let me know so I can have my baby driving sweet again thanks.

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  • Mercury Master
  • 21,873 Answers

Does the smell happen if you are running the hvac on just vent ?
The ac itself would not cause a smell unless the clutch on the compressor were slipping and you would probably hear that.
Its a sealed system just like your fridge at home.
So it could be something in the engine compartment that is coming thru the vent when the ac is on. The most common smell is a musty or mold smell from moisture inside the hvac.

Posted on Jul 21, 2013

  • 2 more comments 
  • menacee1 Jul 21, 2013

    i do go back and forth switching from max to ac and vent to get less fumes is there somewhere i can start as far as removing any mold or mildew and start my process of elimini please let me know if ya can appreciate the post

  •  Stephen
    Stephen Jul 21, 2013

    If it is in fact mold you would probably need to take the hvac box apart to clean it out. I would check the drain to make sure ac condensation is draining onto the ground under the car. There are products for sale that help kill the smell but often times you can't get to the actual problem area without taking the box apart.

  •  Stephen
    Stephen Jul 21, 2013

    If the drain is working, the mold would be killed once you start using the heater in the winter time.

  • menacee1 Sep 18, 2013

    i dont think its mold it smell very highly of gas fumes or carbon monoxide. weird thing tho seitching back the a/c back and forth works sometimes to stop the smell but eventually returns to pushing fumes out. ( this seems to occur more on really hot days )

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Posted on Jan 02, 2017

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SOURCE: how can i rest my check engine light on my 92 grand marquis. it comes on when i am in motion. There is nothing seriously wrong with the car, I do notice the gas milages as been poor. What could be ca

1 minute won't reset any codes for the Grand Marquis. You need to dicsonnect the ground and wait 15 mins for the caps in the comp to fully discharge.

Posted on Dec 15, 2009

  • 5522 Answers

SOURCE: rough idle, check engine light FLASHES,smell of

Go to an Autozone or Oreillys for a free engine scan. This will help you find the problem.

You could have an intake gasket or head gasket leaking into a cylinder. The scanner will show if a cylinder is misfiring and which cylinder it is. You can also get a loaner tool such as a Radiator pressure tester which can pressurize the system without the engine running. In some cases, antifreeze can evaporate or run off while the car is in motion.

Once you repair the part use some household detergent and hot water and clean the area you repaired. The smell from antifreeze will linger for months if you do not remove it. Also after you repair the problem, use the pressure tester again to insure the repair is holding.

Posted on Jun 07, 2010

  • 3911 Answers

SOURCE: 2002 Mercury Grand Marquis hood

take a close look at the male part of your hood latch. should be a heavy spring on it which pops the hood up a bit to allow you to get your fingers in to fully release it. could be missing or bent. You can buy another at a junkyard, most likely any from a full size ford or mercury 95-05 will work. either that or the female release part is stuck and needs some grease.

Posted on Nov 28, 2010

SOURCE: 96 grand marquis rough idle, lossof power while

You work on Check Light issues first,so check
for codes & proceed from there.

Need some knowledge or a trouble chart,as codes
don't tell you what is wrong or what to replace

Posted on Jul 12, 2011

bigred777766
  • 65 Answers

SOURCE: The v8 engine in my 1992 mercury grand marquis has

might be the oil filter adapter (the stud that the filter threads onto). I would try replacing filter first twist on till tight then use filter wrench to tighten 1/4 to 1/2 turn more

Posted on Sep 29, 2011

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