Question about 2002 Ford Explorer

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My 2002 explorer windows keep fogging up inside and does not go away when turn on defrost & my engine light is on like my heater core may be bad but I dont smell antifreeze what else could cause t

My inside windows started fogging up, even with windows cracked and defrost on it still would not clear it. My engine light is also staying on. Acts like my heater core is out but I do not smell antifreeze or anything.

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If it was me, the first thing I'd do is go check my fluid level in my radiator. I'd add fresh anti-freeze, if I hadn't done so in a year or more. Your defrosters won't work properly if you are too low on fluids in your radiator, OR your thermostat is malfunctioning. Replacing your thermostat might be a good job for a mechanic. Good luck.

Posted on Nov 28, 2013

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  • Karol Kingsley
    Karol Kingsley Nov 28, 2013

    thanks, I check my fluids every week. Checked them about this time last week and they was fine. I've only had it for two weeks so ,my fear is I have a gasket leaking since it smokes alittle at idle and when I first give it gas. it has to be going somewhere.

  • sixpack6t9
    sixpack6t9 Nov 28, 2013

    I think you're on the right track, absolutely.You might also notice the position of any puddles you might have where you park, for a clue as to where it might be leaking. Some cars overheat badly when this happens so watch your temp guage. Good luck

  • Kathy Wynn
    Kathy Wynn Dec 03, 2013

    From what you just described, sounds like it could be your heater core or possibly a blown head gasket. A trick to know if its the heater core is to run your finger over fogged window, then lick your finger. If it has a sweet taste, then i would check heater core. It's antifreeze you're tasting.

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If your Air Conditioner is not working during defrost the results will be similar. Low cool;ant temp will also affect performance.

Posted on Nov 28, 2013

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Posted on Jan 02, 2017

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SOURCE: fumes that smell like antifreeze through vents!

well it could be a clog but i doubt it. sounds like you will have to replace the heater core and it takes all day as the entire dash and steering column has to come out.

Posted on Dec 22, 2008

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SOURCE: Fluctuating Temp gauge - '96 Ford Explorer 4.0

Have the system pressure checked. This is simple and quick. Puts the system under pressure and helps to locate leaks. Check cap too. System needs to maintain pressure.

Some engines have a "Bleed" valve in the head so you can force the air out of the system as you fill it with coolant. May want to chekc to see if yours has one.

\Fluxing gage indicates coolant sometime there and sometimes not. Low level. Sound says the same thing.

Good Luck

Posted on Feb 16, 2009

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SOURCE: Truck heater / defrost not working

Sounds like you need to replace your heater core.

Posted on Jan 28, 2010

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SOURCE: 2002 ford explorer wont start even after new battery...

Before you go changing out the starter check for a burnt out fusible link going to the starter it will look like a wire but acts as a fuse and they burn in two just like a fuse. The symptoms you just describe are those of a burnt fusible link.

Posted on Mar 26, 2010

  • 454 Answers

SOURCE: 1998 Expedition: 2000 Ford Expedition I smell antifreeze with heate...

If you smell antifreeze it may be 3 possibilities: 1. you may have a leaking hose/hose connector , or water pump. 2. your heater core is bad and needs replaced. Unless you know what you are doing I would highly suggest taking to dealer for heater core replacement. The dash and steering colum has to be removed to get to the heater core. This is not an easy job believe me (about-900-1200 job). If you have your heater core replaced then also replace the climate control door. This is good preventative maintenance and also a a dollar saver. I would have a pressure check run on your radiator as a first thought. All you may have is a bad hose and that can easily be replaced.

Posted on May 20, 2010

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Smell antifreeze heater and defrost


Broken heater core. Keep an eye on your antifreeze level

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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.

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While driving my 95 explorer i noticed the heater wasnt getting hot its luke warm and when i turn on the defroster i start to smell anti freeze and all of the windows fog up


no heat is probably low coolant or bad thermostat,although you have fog and smell ! the heating and cooling systems are closed systems the only way the windows fog is the coolant is hot and steams inside the car due to some leak inside the heater core box. as well as the smell being present. Now it is possible that a little leak has occured where the coolant supply or return line connects to the heater core and is running into the car which is running onto the core and creating steam and smell. hopefully it is a easy clamp tighten fix for you.

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Why my window is fogging whe i turn the heater ?? i recently bought my toyota carina 3 model 1994 but the window is fogging , what should i do?


Make sure the vent system is set to draw air from outside. If it is set to recirculate the same air that's inside the vehicle without drawing fresh air from outside, the resulting humidity that builds up inside the vehicle can fog the windows even when you run the defrost. You can also try opening the windows a bit to get some more air moving inside.
If it still fogs when the vents are set properly, you may have a leaky heater core. The heater core is a small radiator that is located under the dash that the heater system blows air through to heat the inside of your car and provide heat to defrost the windshield. The fog may be coming from the heater core leaking hot coolant steam that's being circulated through the defrost system. If this is so, you will need to replace the heater core.

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your heater core has probably sprung a leak.does the fog smell kinda sweet?....check the floor in the front where the floor mats are for moisture or even puddles of antifreeze.(the replacement of a heater core can be very expensive as the entire dash usually needs to be removed to access the heater core)also look under the engine near the firewall for antifreeze drips.

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