Question about 1999 Dodge Dakota

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Fog coming from deforst leaving greasy film on window

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It sounds like your heater core is leaking. Check to see if your coolant level is low. A radiator pressure test will show a leak. coolant may be dripping down from the heater air box drain hose. Replacement of the heater core is expensive. you can bypass the heater core, to keep you on the road, by looping one of the heater hoses back to the engine....but you will have no heat. Here are a couple of sites for reference;

http://www.2carpros.com/forum/1999-dodge-dakota-heater-core-vt214043.html

http://dodgeforum.com/forum/1st-gen-durango/18340-heater-core-removal-installation.html

Posted on Nov 07, 2010

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Related Questions:

1 Answer

Y do my front window keep fogging up and white smoke from vents only


This symptom is usually a sign of a coolant leak from the heater core. The fog/smoke leaves a film on the glass. Often you get a sweet-sort of aroma as well. Check for loss of coolant. If you are low, check the heater core for leaks and replace as needed.

Nov 17, 2016 | Cars & Trucks

1 Answer

My windows continue to fog up with a greasy film, I have a small antifreeze leak somewhere, but my car runs fine and doesn't over heat


It is the antifreeze that is causing this. Get that fixed and you will get rid of the greasy film.

Jan 25, 2016 | Cars & Trucks

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What are symptoms of hearing core going bad?


LEAKING on passenger floor plugged up as in no heat.

Mar 09, 2015 | 1995 Toyota Camry

1 Answer

White smoke from air vents while ac was on,greasy film on window while defrost is on/heater coil?


Yes. The heater core is leaking bad. The white smoke is the coolant and steam. Be sure to add water to the radiator before you burn up the engine.

Oct 19, 2014 | Cars & Trucks

1 Answer

When I turn my heater and defroster on, a bad smell starts and the windows fog up but the air is hot.


This may be due to a bad heater core or dirty core with a plugged water drain, first see if the a/c works. turn it on and see if the air gets cold and if the ac compressor works.

The way the defrost works to keep windows from fogging up is that when the front defroster is tuned on the ac should also be on, on most cars when you go to defrost it will turn ac on automatic. the system then uses hot and cold air to remove the moisture in the air to avoid window fogging. if your a/c is not working then that may cause window to fog, but if you are also getting a smell then the drain that lets out condensation may be plugged and then water builds up and also mold from always being wet and when heat is on you smell that.


i want you to run the defrost and when windows fog up wipe window with hand and see if it is greasy . if it feels oily then you may have a bad heater core, the core leaks coolant out and steam and causing windows to fog up with a flim of grease.

Feb 03, 2013 | 2000 Chevrolet Silverado

2 Answers

Windows fogging inside car, maybe a vaccum leak?


If you feel warm air blowing up on your windshield and If your heater is working, I would guess its a coolant leak, probably the heater core. Usually a coolant leak will leave a kind of "greasy" fog that is more difficult to wipe off. It is basically steam coating your windows. You should be able to smell coolant if its leaking.
If no warm air is blowing, I would guess an issue with your heater control module or a vacuum problem of not supplying vacuum to move the plenum door.

Hope that helps.

Dec 16, 2010 | 1985 Ford Tempo

1 Answer

Windows fog up an there is no sign of the heater core leaking


You kind of answered your own question,don't ya think?Run your fingers thru that fog on the window,does it feel greasy?If it is you probably have some form of coolant leak in the heater core housing.Take off the kick panel on the passenger side,put a bag or drop cloths down first!Check the foam that's used for sound dampening on that kick panel.Is it wet?Use a clean white cloth to dab at the liquid,what color is the fluid?The white rag will show you,clear it's water(leak at the windshield or housing).Green,coolant.I sure hope this helps,take care!

Dec 09, 2009 | 2000 Ford Taurus

1 Answer

Defrost and Heater causes windows to fog


If it smells like antifreeze, and leaves a film on windshield, it's probably a leaking heater core, but if not, your drain tube/passage for heater/AC duct-work, is plugged and not allowing moisture to drain out. Not 100% sure where drains are on that but, I would look real close at lower firewall in engine compartment,opposite duct-work, as well as under truck near front floor, for tubes sticking out, and carefully and gently, run a pipe cleaner or similar in & out to clean, until moisture starts to run out.

Nov 14, 2009 | 1999 Dodge Durango

2 Answers

2000 S10 Heater/Air


you have a bad heater core

Feb 03, 2009 | 2000 Chevrolet Impala

2 Answers

I have front glass fogging issue


Possible heater core leak. Is your coolant level going down, and perhaps an odour inside? Can you feel a sticky film of inside of windsheild?

Dec 12, 2008 | Honda CR-V Cars & Trucks

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