Question about 1998 Ford Explorer

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Defroster fogging up window - 1998 Ford Explorer

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Hello. There are actually a few possible causes of this issue.


Once the air that's coming out of the vents gets warm, it will defog the windows. It just takes time. Some cars take longer than others.

If it never warms up you could have one of a couple of issues. 1. Your coolant (water/antifreeze) level is low. Check it and top it off with a 50/50 mixture of water and antifreeze. You can buy it premixed at any parts store or Wal-Mart. 2. Your heater core is clogged/leaking. Get it checked out. Good luck.

Posted on Jan 30, 2010

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Run your finger thru the moisture,is it oily?Oily is a bad heater core,the antifreeze is leaking by the core and needs replacement.
Not oily,water.Water is not draining and is being heated up and shows as fog on the windshield.You need to clear the heater core box drain.There's a drain under the hood just below the heater box.Get under your truck and look up at the box,you'll see a short hose extending downward from the box.That's where the clog is,you need something to open up the hole with that is only an inch or so longer than the hose itself.Any longer and you take the risk of puncturing the evaporator core.This is dirty work and once the clog is free that water is going to pour out so be careful.

Posted on Jan 30, 2010

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Your heater core has a leak in it and needs replaced.
Do it now before all your coolant ends up inside the truck.

Posted on Jan 30, 2010

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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.

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Heated air in large quantities is what gets rid of window fog. Make sure you're actually getting hot air out of the dashboard vents, and if not, follow that problem.

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Is the a/c working ? The a/c helps dry the air blowing on the glass in defrost mode.

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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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The radiator cap was replaced on my truck and now smoke is coming through my vents when i turn on heat the windows fog up and the defrost fogs my windows


it sound to me that you might have a slight leak in your heater core. The leak is what s causing the windows to fog up, cause it's actually radiator fluid leaking. Is there any odor present?

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Was there a smell along with it fogging up the window like antifreeze? If it did the heater core is leaking and needs to be replaced. It will be kind of a sweet smell.

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That is normally a classic symtom the Heater core has gone, Another is normally lost of coolant or smelling of antifreeze

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The inside of the car fogs up and on very cold mornings ice forms


This can be caused by a heater core that is leaking inside the car, one way to determine if that's the problem, is if you can smell antifreeze. It is a 'sweet' smell, and is quite noticeable. If u don't notice this, I have to say this is a common problem w/ Hondas. I've had a civic, 2 accords (currently have a 92), and 2 Preludes, they are great cars, but they all suffer from fogged up windows in cold weather. One reason is that they are quite air tight, and the older models don't have the greatest defroster system (weak). Try and keep a window cracked open slightly, see if that helps.

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