My car is an EV, so it definitely does this because there’s no excessive engine heat to use.

When I press the defrost button in my car, it turns both the heat and AC on at the same time. I assume this is to remove water from the air with the AC, then warm up the air increasing its capacity to hold water with the heat.

Solder is mostly tin, sometimes combined with lead. It would melt the very second you put it on the stove.