Originally Posted by IngotFoFo
I see no problem with It, some mornings you have no choice when the windshield is frosted over. I would be careful running just the engine then turning on the heat because instant heat from the defroster will cause a cold windshield to crack. If you turn the defroster on from the get go, the temperature change is gradual and that risk is eliminated
I've never heard of a windscreen cracking because of that lol
you can't be serious.
If its really cold below 20f, I'll wait a few mins then go.