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Smoke or steam coming from A/C vents..

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Old 09-07-2010, 12:05 PM   #1
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Default Smoke or steam coming from A/C vents..

Ok so it was raining really hard all day yesterday, and my car just sat in the rain. When it finally stopped i took my car out and as soon as i give it a little gas to get on the highway smoke or steam or some sort of vapor comes pouring out of my A/C vents.

So i pull over check to make sure there is no fire or anything, but the weird thing is the smoke was completely odorless.

So i make i turn my A/C off and drive to the gym, when i get back i turn the A/C on and its fine..

Well a couple of hours later on my way home i smell burning plastic, so i turn the A/C off and pull over and the smell goes away.

any ideas??

Cliffs:

odorless smoke/vapor coming from A/C vents when A/C on.
Burning Plastic smell later on in the night.
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Old 09-07-2010, 01:19 PM   #2
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The vapor is exactly that, water vapor. After a rain storm the humidity is high, when cold air mixes with hot humid air it hits the dew point. Thats where the water wants to seperate from the air.
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Old 09-10-2010, 02:19 PM   #3
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Usually steam from the vents means that the heater core has sprung a leak.
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Old 09-10-2010, 02:27 PM   #4
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I was going to say the heater core, but you can smell the antifreeze.
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Old 09-10-2010, 02:27 PM   #5
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Quote:
Originally Posted by IRACE2 View Post
Usually steam from the vents means that the heater core has sprung a leak.
ODORLESS steam on a HOT HUMID DAY is not a heater core leak.

Take your radiator cap off and smell it, it sure isn't odorless.
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Old 09-13-2010, 11:48 PM   #6
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Something burning in the a/c fan motor? water collected around the fan motor and turned to steam early on. As motor got hotter something else got burnt causing the smell. Thats my 2 cents.
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Old 09-14-2010, 05:35 PM   #7
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99% chance it's just condensation from the cold air meeting the humid air.

No smell = no antifreeze.
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