So I've got a really specific issue that's not a major problem, but it is annoying. It's also difficult to do a search for this issue on these forums since the search term "cold air" tends to just pull up matches to threads about CAI's.

When I'm making a sharp turn at low speeds (usually 90-degree turns at 5-10 MPH) I feel cold air blowing from my dashboard air vents. This happens regardless of what setting the AC system is at, whether it's set for hot or cold air, but I only *really* notice it in the winter when the air system is set at High heat, Windshield defog mode. I believe it does happen in the summer too, but the air temperature difference isn't as noticeable as it is when it's really cold outside. I live in Michigan so it's really cold right now. I believe the air that blows is just whatever the outside ambient air temperature is, so if it were 70 degrees outside right now I wouldn't notice anything.

It also doesn't seem to matter whether the AC system is set for Windshield only, Windshield/floor, Dash/floor, or just Dash. It also happens even when the Fan setting is set to 0 (off). I only really notice it while turning right, if I turn left I really don't notice anything, same with when I'm going straight at low speeds. It might still happen when turning left, it's just not very noticeable.

Any ideas?

 

That happens to me too! First I thought my 8 was haunted, and the spirit is trying to communicate. But then it occurs with the same pattern as you had described. So I scratched off the ghost theory.

 

At low speeds my first guess would be a small vacuum leak or a poor vent controller allowing cold outside air to enter the car.

 

I have this weird issues since I replaced (the job was done in a local shop) whole cooling system (radiator, hoses, pump & t-stat).

In my case it happens if I take right turn fast enough and turn itself is long enough I can feel cold air blowing from the vents.

Any hints of what can be wrong & how to fix it?

Alex