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I must assume that the outside temp was below freezing.
Frost inside comes from the same thing as condensation on a cold drink glass. Common in the Houston, maybe not in your area.
Air has a certain amount of water vapor in it. How much is a function of the air temperature, warm air can hold more water vapor. It's a scientific fact that air at "X" temp can hold a max of "Y" water vapor. Relative humidity is the fraction of "Y" that the air has in it. If the vapor amount stays constant but the air temp drops, the relative humidity goes up. It cannot exceed 100%.
You may not notice the humidity in the car. But when that air touches cold, like the window, it gets chilled to the temp where it cannot hold the contained water vapor any more.
The vapor condenses as droplets, and if the cold surface is below freezing, the droplets can freeze on the surface.
So to stop the phenomenon you must reduce the relative humidity of the inside air. Several approaches. One is the leave the air control on outside air, as air drawn in will have low relative humidity once heated. Additional to that one can run the air conditioner, chilling the air further (maybe) and forcing more water vapor out of it.
It's either that or warm up the glass itself, which is practically impossible except for the rear window which has the electric strips.
If you experience inside fogging/frosting on the windshield, do the above especially running the a/c and the demist air setting.
Good Luck,
Bob
:>)
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240s: 1986 244GL, 1988 244GL, and 5 others.
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