Question about 1999 Jeep Grand Cherokee

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

Have started smelling water(as in when it is warm) when I am driving my 99 jgc and replaced my upper and lower radiator hoses, but still smell it. I have no water on the floor inside and haven't noticed any under the vehicle when it is parked. Also, the heater on the passenger side doesn't put out heat, only COLD air. Sometimes the windshield fogs up inside in the center down by the dash.

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  • curiouseve Nov 12, 2008

    Hi there, I have the same problem but a little worse-I had anti-freeze leaking inside the passenger's side!! I just dropped my Jeep off at the mechanics this morning-they had a heater ordered, and ready to install. However, they seemed unfamiliar with the second issue of cold air coming out of the passenger's side-are you suggesting once the heater core is replaced warm air will begin to disburse again? Or is this a separate problem?

  • Anonymous Mar 16, 2014

    The right side of the windshield and the passenger side glass tend to remain fogged over even after the driver's side has completely defrosted. I am also getting the slight scent of coolant from time to time.

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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!

Posted on Oct 26, 2008

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1 Answer

When running heat or defrost, the drivers side of the windshield will fog up....no leaking coolant or antifreeze smell.


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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.


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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.


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