What is the mist that occasionally blows from my vents when I use my car a/c?

Question

Its a 79 chevy caprice

Answer 1

Have your heater core checked, the cold air blows through it, even when the heat is off. its possible you could have a bad hot water shut off valve, cold air passing through the core could cause condensation if the heater core is hot!!! AUTO TECH 22 YEARS

Answer 2

is it liquid mist? or just really fine dust? There should be a drain hose under the car to release the humidty. You can check it by looking under the car when the air has been on for a while, you should see a spot where it looks like water is leaking from under the car, if you don't see this it has probably been plugged with something so all the condensation is building up in the system and eventually reached the point that it is being forced out by the air circulation

Answer 3

Condisation, in high humidity times this can happen. If you notice a haze on the inside of your windshield check the heater core. A pin hole can do this. An overcharged AC system can cause the air to appear as mist similar to your breath in winter.

Answer 4

The moisture in the air, when cooled by the a/c, will cause condensation like 'mist'. Happens in humid areas, esp. after rain.

Answer 5

Condensation.

Answer 6

Condensation, looks like steam, no odor,usually happens when you roll a window down or open a door,,,if it has a fishy type odor you probably have a heater core leak,,,

Answer 7

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Answer 8

depends could be dust, or if it smells like a hospital it might be freon, if its more wattery that means the drain is cloged try looking at the fire wall on the pass side look for a small rubber tube and squeeze it

Answer 9

Anthrax

Answer 10

Maybe a freon leak or maybe it's the cool air hitting the cold.