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Coolant smell when defrost is engaged in hot setting

2001 Mercury Grand Marquis windshield fogs up when defrost is used during cold mornings on hot setting.have not noticed smell when using AC

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RUB YOUR HAND ON THE FRONT PASSENGER SIDE CARPET, IT MIGHT BE WET. IF IT IS IT'S PROBABLY THE HEATER CORE. THE SMELL IS A GOOD SIGN TOO.

Posted on Feb 19, 2009

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On first start up there is no heat until the car warms up so the defrost is blowing colder air, could be problem.
but also could be heater core leak, check floor under the dash for wetness, or the evaporator case for wetness.
check coolant level in engine bay.
worst case scenerio there is a bad window seal

Posted on Jan 29, 2009

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Just has the last tech said heater core has a leak this will be a little exspensive to fix thanks for your question

Posted on Jan 29, 2009

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Heatcore is shot and needs to be replaced

Posted on Jan 29, 2009

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U HAVE A LEAKING HEATER CORE.

Posted on Jan 29, 2009

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There is only one possible cause to this easily diagnosed symptom. Any mechanic will tell you: the heater core is leaking. This is why the steam is rising up to the windshield, and why you are smelling coolant. Your heater needs to be replaced. There is not quick fix, just replacement. Hope you can get this done soon. Heater cores are nice to have during winter weather. Steamy windows aren't easy to see through, and are hard to defrost! Thanks for the question. Good luck. TT

Posted on Jan 29, 2009

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1 Answer

Windshield and driver & passenger windows fog constantly. this is a new problem


its normal if in recirc. mode. or not normal if stuck there.
the heater core is leaking engine coolant (funny smells)
for defrost mode is bad. , due to inop. dampers.
if heat is good to other ports. , then its damper failure.
the FSM covers the tests.
see that here
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

Feb 12, 2014 | 2000 Jeep Grand Cherokee

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My 2001 jeep grand cherokee has a dark mist/smoke coming out of the vents, and defroster. But, the heater works fine. What could it be?


DO NOT USE STOP LEAK!!!!!! That stuff has no brain so you cant tell it to plug only specific leaks. It will go for the easiest hole to plug which can be a water port in the cooling jacket for the cyl heads. replace the heater core. Fix it right or bypass but please please please do not use anything that will stop a leak

Dec 22, 2012 | Cars & Trucks

2 Answers

My 1984 grand marquis does not have interior heat.


re check the coolant level, it most likely dropped when your engine reached temp for thermostat to open and took what you had just poured into radiator and put it in the block.

Oct 08, 2012 | 1984 Mercury Grand Marquis

1 Answer

Climate control system blows only through the defroster vents and not through the passenger compartment vents; the windshield fogs in high humidity and windshield wipers are necessary to clear the fog. ...


If the fogging is plain moisture and not coolant (it would take on a green hue and you would smell coolant if this is the case) than the issue is with the blend door actuator. This component diverts air from the window, to the vents and floor. You may have a "stuck" door or a defective blend door. If it is coolant you are seeing (smelling), you may have a bad heater core. When bad, a heater core will dispel green vapor through the defroster vent.

Assuming the problem is merely the blend door, you may be able to free the part (if it's stuck) by locating it (usually under the glove box or between the glove box and middle console.

Jul 31, 2011 | 2006 Mercury Grand Marquis

1 Answer

My 2004 Mecury Grand Marquis ac will blow cold or hot thru the vents for a short time. It then goes to the floor and defroster mode. I understand this is a failsafe mode so in winter your windshield...


does your car have auto climate control or manual ?? if manual most likely you have a vaccum leak ..this is # 1 problem for failsafe mode ..start by listening to your engine while it is running with the hood open and listen for a hissing sound..(check pcv hose and elbow)

Jul 28, 2011 | Mercury Marquis Cars & Trucks

1 Answer

My car smells like it is overheating but does not and the windows fog. when i put my windshield defroster on, it takes a long time to do anything and sometimes the fog gets worse.


it sounds like you have a heater core leak. If it smells sweet and the floor is wet on the passenger side, it is a leaky heater core. Costly repair.

Jan 11, 2011 | 1996 Mercury Grand Marquis

1 Answer

Windows wont defrost gives off a bad smell and make windows look greasy


Hello m_howard.
This is a classic case of a leaking heater core.
Coolant is leaking out and being blown up on your windshield and the vapors inside the car.
Unfortunately it will need to be replaced.
A heater core will be about $80.00 and about 6 to 7 hours labor to replace according to the time/labor guide.More time may be required if your Marquis has air conditioning.
May be a good idea to get a couple of estimates first.
If you have more questions, leave a comment and I will reply.

KL

Nov 30, 2009 | 1996 Mercury Grand Marquis

1 Answer

When i run the heat or air cond. i smell water and windshield fogs up in the middle.


Sounds like your heater core is bad. Have someone check out the heating system and possibly replace heater core.. that should take care of the fog problem also by enabling you to use the defrost... Good Luck!

Oct 26, 2008 | 1999 Jeep Grand Cherokee

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