Dear Car Talk: I have a 2015 Yukon XL with a cloudy inside windshield. It looks perfectly clean until the sun or oncoming headlights shine on it. I have tried to wash it with glass cleaner, and also ...

I just wanted to know, in general heatercores are of copper (at least anything thats going to be touching water) right? So basicly if it doesn't specificly say alluminium its copper, or is it the ...