why do i get frost on the inside of my car windows?

Question

im thinking because my heat isnt working

Answer 1

Check the heater controls to see if you have the recirculate mode selected. The heating and ventilation systems on most vehicles have two air modes, fresh air and recirculated air. The fresh air mode allows the ventilation system to pull in outside air to be heated or cooled for the passenger compartment. The recirculate mode does what the name indicates, cabin/inside air is used and to heat or cool. There would be no problem with that if you didn’t breathe. We humans expel a lot of moisture and inside a vehicle this moisture turns into condensation. Condensation just loves to collect on cold glass surfaces. During winter operation it is best to induce outside air to the ventilation system to aid purging moisture from the passenger compartment. As the weather warms that’s a different story for another time.

Answer 2

Windshield Frozen Inside

Answer 3

If you live in a moist climate, moist air gets into the car through the air plenum. Leaky weather seals will also allow water inside the car. Finally, a slightly leaky heater core will contribute to condensation inside the car. As soon as the outside air goes below freezing, the condensation on the inside of the windows freezes.

The first thing you need to do is dry out the car with a small electric space heater. If carpet is wet or damp, you may need to remove and dry i out inside the house. Next find the source of the water leak and fix it. if you are getting no warm or hot air out of your heater you either have a blocked heater or insufficient antifreeze in your coolant (ideal is 50% water and 50% antifreeze).

If you have a "Fresh-Recirc" control in your heater quadrant, set if to "Fresh". Recirculated air inside the car recirculates the water off your shoes and your moist exhaled breath.

I have had all of the above problems over the years living on the west coast of Canada.

Answer 4

It means that the air inside your car is very moist. This happens all the time in some parts of the country, so first you need to find out if everyone around you has the same problem or if it's only you. I guess there are lots of things that can cause this, but when it happened to me it was because there was a small leak in my heater core and when I turned on defrost it actually sprayed a mist on my windshield. Good Luck!

Answer 5

Maybe a small leak in your heater core. Those small leaks get big real fast.

A blocked and leaking heater core usually happens on older cars... 12+ years. It has the 2 effects that can cause frost build up. 1- doesn't heat up real good. 2- hot damp air rised to the windshield inside and freezes.

Bypass it and/or take it to a shop to be checked.

Answer 6

Condensation. When your windows are closed, your exhaled air goes somewhere. It collects on your windows, and freezes because of the cold air from outside your car.

That, and your car may not be quite warmed up yet, or your heater isn't putting out enough heat.

Answer 7

i own a repair shop,and this can mean you have small leak inside of the car,,any moisture will collect on the glass if it has a leak in it,,mine was doing this,and it was leaking around the trunk lid on it,just enough to make it have a little moisture in it,,and i finally found it,,now i doesn't do it at all,,but you might want to check it real good and see it has a wet spot in the carpet or something,,good luck,i hope this help,s..have a good x-mas.

Answer 8

Only way for that to happen is if the air inside the car is damp

Answer 9

I have the same problem and also if you track snow in you vehicle and don't clean it out you could get moisture in there from that. Like I do because it sticks on my carpet