hawkdog

I was driving home on I-95 yesterday with the A/C on and about once a minute or so a puff of steam/condensation was coming out of the A/C vents. It was about 95 degrees and 95% humidity yesterday. Is this normal?? I've never seen a car do that before.

FO2K

Quite common when it is very humid. The temp of the recirc air is below the dew point.

rworne

I've seen this very problem on passenger jets (makes the passengers nice and jumpy when they see it) and in a Ford Tarus rental.

The common factor: Both were in the Gulf Coast (New Orleans and Biloxi), during 95F summer weather and practically 100% humidity.

When the warm, humid air that is carrying all the water vapor it can at a given temperature gets cooled, the water vapor condenses out of the cooler air and forms a fog. Let it run long enough and it'll coat all the windows in the car with dew.

steven975

mine have all done it.

My S did it today. The AC works by blowing air through what looks like a radiator (but instead of hot coolant, the freon flows through it. On hot/humid days, this gets water all over it, kinda like a cold drink on a hot day. The air blows through it and carries some of that condensation with it.) no biggie!

Hustn

This is common in high humidity. The temp coming out of the vents is cold enough to lower the surrounding air temp below the dew point forming fog.

Zangerzone

Happens once a week or on very hot and humid weather.