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Old 07-14-2013, 05:33 PM   #1
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Mist or smoke coming from vents with AC on

Pouring rain here in DC on Friday morning, I turned on AC and some smoke or mist came out.

Any advice?

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Old 07-14-2013, 05:39 PM   #2
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Not unusual especially during times of extreme humidity and heat.

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Old 07-14-2013, 06:01 PM   #3
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On my TJ, that was the first symptom of the heater core on its way out.
I occasionally got the mist/smoke which got worse after about 6 months.
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Old 07-14-2013, 06:30 PM   #4
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Even the smallest drop of anti-freeze seeping out (hot) will cause this. May not be enough loss to notice in level of catch/tank at radiator. When it gets worse you can smell it at the a/c vents while blowing. Usually when small cannot detect at a/c condensate drain. You could take the (2) hoses off at the heater core and put a metal barbed splice so the coolant hoses to go back to the engine (in a loop) , untill you get around to fixing it. Be sure you are working on the coolant hoses going to and from the heater core. I assume no responsibility if you do this wrong (even though it is simple to do). Replacing the heater core can be a real pain.
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Old 07-14-2013, 06:55 PM   #5
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My first inclination is to agree with Jim. Mine does that too and it's due to the humidity. Or if you have the AC running, turn the AC off and then turn it back on later - that'll get the mist to come out vents too.

If you're worried about Heater Core - you'll be able to smell it eventually (and probably wonder why your jeep smells like pancakes). You can also check in the passenger side floor to see if there is any dampness or antifreeze down there. That won't happen until your core is in really bad shape, though.
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Old 07-14-2013, 08:32 PM   #6
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I initially thought about it being the humidity and weather. Ran around today topless and just put top back up for the evening and ran the ac … no smoke or mist coming out. I'm not convinced yet its ok until road tested and the weather here is supposed to be hot and dry.
Will post tomorrow any findings when I get to work
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Old 07-15-2013, 10:08 AM   #7
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Might want to check and make sure the a/c drain is fully open.

If it's partially restricted, it may allow the a/c to function normally, but in high humidity it won't let the condensation flow out fast enough, and the fan will blow water up into the case/ evap which can cause a similar condition.


It's like opening the freezer on a hot day, the "smoke" is nothing more then near frozen water vapor hitting hot air.
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Old 07-15-2013, 11:11 AM   #8
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What did the weather say was the relative humidity for that day? My bet is that it was humid outside and it was a normal reaction to the high humidity.
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Old 07-15-2013, 11:52 AM   #9
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Cold air coming from the vent will appear smokey/misty as it hits hotter humid air. It's totally normal.
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Old 07-15-2013, 08:28 PM   #10
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If your AC is set on the "Recirculate" position; during high humidity the vents will blow out condensation and you may find water dripping on the passenger floor. Just change the AC setting to pull in the air from the outside rather than recirculating the cool air inside the cabin.
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Old 07-16-2013, 12:05 PM   #11
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Quote:
Originally Posted by hrun View Post
If your AC is set on the "Recirculate" position; during high humidity the vents will blow out condensation and you may find water dripping on the passenger floor. Just change the AC setting to pull in the air from the outside rather than recirculating the cool air inside the cabin.
The concept is correct except backwards. With AC set on recirculate it will ship cooler dryer air to the Evap reducing the work load and condensation . Not increasing the load.

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