# 1997 Jeep Grand Cherokee windshield fogs up for no reason **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** grand-cherokee, jeep\ **Created:** [September 24, 2018, 7:28pm UTC](https://community.cartalk.com/t/1997-jeep-grand-cherokee-windshield-fogs-up-for-no-reason/125630 "2018-09-24T19:28:19Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Jerry17](https://avatars.discourse-cdn.com/v4/letter/j/b77776/32.png) [@Jerry17](https://community.cartalk.com/u/Jerry17)\ **Post date:** [September 24, 2018, 7:28pm UTC](https://community.cartalk.com/t/1997-jeep-grand-cherokee-windshield-fogs-up-for-no-reason/125630/1 "2018-09-24T19:28:19Z")
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. ---
**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\ **Post date:** [September 24, 2018, 8:31pm UTC](https://community.cartalk.com/t/1997-jeep-grand-cherokee-windshield-fogs-up-for-no-reason/125630/2 "2018-09-24T20:31:31Z")
Inside or outside of the windshield? ---
**Author:** ![Jerry17](https://avatars.discourse-cdn.com/v4/letter/j/b77776/32.png) [@Jerry17](https://community.cartalk.com/u/Jerry17)\ **Post date:** [September 24, 2018, 8:39pm UTC](https://community.cartalk.com/t/1997-jeep-grand-cherokee-windshield-fogs-up-for-no-reason/125630/3 "2018-09-24T20:39:16Z")
Outside I believe but haven’t actually checked that ---
**Author:** ![COROLLAGUY1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/corollaguy1/32/7575_2.png) [@COROLLAGUY1](https://community.cartalk.com/u/COROLLAGUY1)\ **Post date:** [September 24, 2018, 8:47pm UTC](https://community.cartalk.com/t/1997-jeep-grand-cherokee-windshield-fogs-up-for-no-reason/125630/4 "2018-09-24T20:47:35Z")
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. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [September 24, 2018, 8:50pm UTC](https://community.cartalk.com/t/1997-jeep-grand-cherokee-windshield-fogs-up-for-no-reason/125630/5 "2018-09-24T20:50:02Z")
Have someone check and see if the condensate drain tube for the AC is restricted. Tester ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [September 24, 2018, 9:00pm UTC](https://community.cartalk.com/t/1997-jeep-grand-cherokee-windshield-fogs-up-for-no-reason/125630/6 "2018-09-24T21:00:38Z")
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. ---
**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\ **Post date:** [September 24, 2018, 9:58pm UTC](https://community.cartalk.com/t/1997-jeep-grand-cherokee-windshield-fogs-up-for-no-reason/125630/7 "2018-09-24T21:58:48Z")
Was my first guess also, unless the fog is on the outside. ---
**Author:** ![BillRussell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/billrussell/32/3179_2.png) [@BillRussell](https://community.cartalk.com/u/BillRussell)\ **Post date:** [September 24, 2018, 10:03pm UTC](https://community.cartalk.com/t/1997-jeep-grand-cherokee-windshield-fogs-up-for-no-reason/125630/8 "2018-09-24T22:03:48Z")
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? ---
**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\ **Post date:** [September 24, 2018, 10:23pm UTC](https://community.cartalk.com/t/1997-jeep-grand-cherokee-windshield-fogs-up-for-no-reason/125630/9 "2018-09-24T22:23:59Z")
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.