Page updated on 05-23-2018

Radiator cause windows to fog up?

08-20-2004, 03:17 AM
I have a 1993 cavalier. When I first purchased it a few years back I had to replace the radiator because all the fins fell out and it was running hot. I noticed one day that is happening again. Not sure if that is relevant or not. Anyway lately I can smell antifreeze when I first drive the car. It only smell it for a while and then goes away. I always leave the defrost on and the temp level to cool in the summer, but the other night driving to work it was bit cool so I reached down and turned the temp up a bit and when I did all the windows in the car fogged up. To the point that I could not see. I turned the heat down and it slowly defrosted, I also have to wipe the windows with a rag. They were very heavily fogged up. With winter fast approaching I would like to have heat. Does anyone know what could cause this?? The radiator fluid levels are ok so I don't suspect a leak. So not sure. Sure would appreciate some ideas


08-20-2004, 02:53 PM
it's bet it's your heater core lift up your carpet on the passenger side front and see if it's wet under there. that happened to me in my old car. hope this helps

08-20-2004, 05:54 PM
I agree, it sound like a heater core went bad.

08-20-2004, 06:18 PM
Ditto, replace the heater core.

08-21-2004, 10:13 AM
I also suspected the heater core. but I checked the floor and it is not wet at all. Is it possible to for it to be bad and not leaking? Also can anyone point me to some manuals or some thing that explains how to change the heater core? I also noticed today that there is a nipple sticking out of the firewall on the passenger side into the engine compartment that was dripping antifreeze. It looks like it should have hose connected to it, but I don't see any hose hanging there or where in might have gone.


08-21-2004, 03:45 PM
That nipple is the heater core. You may be lucky and just have a loose connection. A very small amount of antifreeze is all that is required to get on the heater core, evaporate, and really fog up the windows. To access the heater core the cover is under the center of the dash. If you remove the passenger seat you will have a nice place to lay in there and get to you work. Good Luck.

08-22-2004, 04:16 PM
as public said and others is most likey the heater just happened to me in my old car...there where no signs of it on the floor..but it smelt like it and the windows fogged i had it replaced and the windows dont fog up and theres no anti-freeze smell.

08-24-2004, 07:28 PM
Thank you all for the help it was indeed the heater core. I pulled the plastic cover off it and it was full of antifreeze. That was the reason there was no antifreeze on the floor the cover was sealed and had a drain going out the firewall. Thank you public for the idea to remove the seat made the job so much easier.


Add your comment to this topic!