1997 Jeep Grand Cherokee windshield fogs up for no reason

jeep
grand-cherokee

#1

My jeeps windshield is fogging up for no apparent reason. It happens at all different times of day and even while driving down the road. If I turn my heater on on defrost it disappears quickly but returns as soon as I shut it off. It is still too warm to be driving around with the heat on in fact ive got windows open. Is there a root cause to this issue just started happening in the last week or 2.


#2

Inside or outside of the windshield?


#3

Outside I believe but haven’t actually checked that


#4

Usually when it fogs up like this,water is getting in.Check around window seals and around windshield.Check your carpet for any wet spots.


#5

Have someone check and see if the condensate drain tube for the AC is restricted.

Tester


#6

If the fog was on the outside of the windshield you would be able to clear it with the wipers. I think the fog is on the inside and the heater core is leaking.


#7

Was my first guess also, unless the fog is on the outside.


#8

I have a similar problem on my Forester. In a light rain condition, the rear window fogs up on the outside, but only on the area covered by the rear wiper. I am puzzled by that. The defroster does little good. I can keep the wipers running, but why is the area not covered by the wipers fine, no fogging up?


#9

If it’s on the outside, the windshield’s temperature is below the dew point. If it’s on the inside, you have a moisture buildup inside the vehicle. Do not use recirculate mode for the HVAC system. If you smell antifreeze, the heater core is leaking.