Confirm my diagnosis!

Qtrhrse23 said:

I've seen smoke coming from my vents on very humid days. Many a time.

I could see why you think heater core, but that isn't the only scenario that produces the smoke in vents.

Another is when it's 100+(Texas) and you turn the AC on. When it's real bright in car from sun, the smoke is there. No wet carpet?

And the coolant won't rise in the overflow everytime.

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