owned 3 volts but have never experienced anything like this. Actually, no maintenance issues or problems whatsoever except for the recalls.

 

Your condenser drain could be plugged. I've heard of it happening to others. And it very might well be the source of your issue. Take it to the dealer they should be able to clean out the drain if that is the problem.

 

and if it has been plugged for a while, they should do a complimentary "foam clean" of the heater core to get rid of any mold or nasty stuff that would have grown in there.

 

I've had similar issues with my Gen 1 on a few occasions. Documented the first one here: http://gm-volt.com/forum/showthread.php?24753-Defogging-fail I ended up taking it to the dealer to make sure the humidity sensor was working, and everything checked out normally.

My only/best guess is that the Volt seals off the cabin air very tightly from the outside when the vehicle is turned off, so if you have warm, humid air trapped inside, and then the outside temperature drops significantly while the car is parked, the humidity condenses on the windows. What I can't quite come up with a theory for is why the Volt would be any different from any other vehicle in this regard. My previous car was a '95 Civic with less-than-perfect seals around the doors, so I can't really compare to how other new-ish vehicle behave in these conditions.

 

It would help to always use recirculate, that is the only way its going to be effectively to dehumidify the air. What your currently doing is pumping the cabin full of moist air and then bottling it up.

 

If the HVAC drain is plugged, then recirculating will not remove any moisture from the cabin. If outside air brought into the cabin is colder than the cabin temperature then the relative humidity will fall as the air is warmed. By cracking a window while pulling in outside air it should be possible to expel some moisture even if the HVAC drain is plugged. But a plugged drain is the most likely cause and the best solution is to have it cleared.

KNS

 

If it is a plugged drain, one fix is to find the hose under the car and blow compressed air up to unclog the hose. But if you are really full of water, that might send liquid up into your dash and all over the interior floor before the water can drain out. The other option is to climb around underneath the dash (you need to be a chinese acrobat to successfully perform that feat without wrenching your back) and take stuff apart, sucking out the liquid with a wet-dry vac through a makeshift straw (duct tape and a small hose works well). I'm sure there are other McGyver tricks that could be used.

 

I've owned three Volt's since March 2012 and operating them in all weather conditions here in southern Illinois and have NEVER experienced anything close to what you are describing/experiencing.

My advice is to have your local Chevy dealer. Good luck.

 

I thought I would add to this thread rather than start a new one. We've had our 2017 almost a month now and every time you get in the car to start it after it has been sitting (overnight or just while in the grocery store), the inside of the windshield fogs up upon startup.

Turning on the defrost yields mixed results. In my other cars, the AC comes on with the defrost and will usually clear the fog in seconds. In the Volt, it takes quite a bit longer -- and sometimes never really clears up. We have tried playing around with all the settings and have not found a combination that seems to help with this problem.

Hoping to avoid a trip to the dealer...checking to see if there's any other recent experience like this from the group.

 

Just to be clear, (pun intended) the windshield icon with MAX under it is the defog control. The other one, in the center without the MAX is the air flow control. The one with MAX will turn on the AC, the one without will not.

 

I had this happen to me. Well, we went to attend wedding in Hawaii and did a rain dance there at the wedding party, so it diverted the pineapple express to deliver the much needed water in California. We were gone for ten days. My 2017 Volt was parked outside, plugged in while we were gone.

I used the Volt the following morning when we came back and was surprised that the inside windshield is covered with thick moisture. I did not precondition the car before I used it like I usually do. It took a while for it to clear out using the MAX Defogger, so I have to wipe off the inside with a paper towel. I've always preconditioned my car except for this one time after I parked it for 10 days.

I don't see the problem anymore as I always precondition it as soon as my alarm clock goes off and I prepare to work.

 

I live in New York. I have a 2018 volt and have the same issue where I've come out in the morning and actually found droplets of water all inside my front windshield after the car was parked for a few days. On most days I have some type of condensation on the inside of my windshield and it's very annoying. Most of my issues happen in almost every season but less in the summer.