Can Outside Humidity Affect Vapour Coming from AC Vents in a Car?

  • Thread starter DaveC426913
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In summary, the conversation discusses the topic of seeing vapor coming from AC vents in a car and whether it is a normal occurrence. One person mentions experiencing it and another suggests it is caused by the cold air hitting warm, humid air inside the car. There is also mention of a potential leak and concerns about the AC breaking down.
  • #1
DaveC426913
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Are there any normal* circumstances under which one might see vapour coming from the AC vents of one's car?

*non-broken-thing


I'm wondering if it had something to do with the outside humidity and the internal temp or something. It was about 28C out, and it's a sunny, muggy day. I had the internal temp at 22. It seemed to happen only when the car was in motion; the moment I pulled over it seemed to stop but if I started back on the road, it would start up again.



On the other hand, when I shut off the car today, the AC made that long, rattly, breathy sigh before going quiet. Has my AC finally given up the ghost?
 
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  • #2
Oh, my AC on my old SAAB 9000 Turbo did that right before it started spitting little chunks of ice at me. $600 later I pick it back up from the repair shop and about 5 minutes from the place it starts spitting out little ice pellets and dies. I drove it back to the shop, "OH, well, what we did needing fixing, but there must be another problem." Quote to fix 2nd problem $700, because they have to take everything apart again. I told them where they could stick their quote.
 
  • #3
DaveC426913 said:
Are there any normal* circumstances under which one might see vapour coming from the AC vents of one's car?

*non-broken-thing

Yes, I experienced visible vapour (misty haze) coming from my air vents just a couple months ago. I have an 04 Accord with no problems. I don't remember the circumstances though, but I'm sure weather conditions played a part.
 
  • #4
It might not be mist coming out of the vent so much as the cold air from the vents forming mist when it hits the warm wet air inside the car?
 
  • #5
Evo said:
...

(giggle giggle)
 
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  • #6
It's completely normal. The AC takes in warm, humid air from outside and chills it. The relative humidity goes up as the air is chilled, and goes over 100%. The water condenses into a fog, and comes out the vent.

- Warren
 
  • #7
K, thanks. I'm a bit paranoid because I know there is - or was - a tiny leak. It drained once but when I had it repaired they found nothing. I'm driving on eggshells, waiting for it to go kerflooey.
 

FAQ: Can Outside Humidity Affect Vapour Coming from AC Vents in a Car?

1. How can my Chrysler be "gassing" me?

There could be multiple reasons for this, but one possibility is that there is a leak in the fuel system, causing gasoline fumes to enter the car's cabin.

2. Is this dangerous?

Yes, inhaling gasoline fumes can be harmful and even toxic. It is important to address the issue as soon as possible.

3. Can I fix this myself?

It is not recommended to try and fix a potential fuel leak yourself. It is best to take your car to a certified mechanic who can properly diagnose and repair the issue.

4. How can I prevent this from happening?

Regular maintenance and inspection of your vehicle's fuel system can help prevent leaks and other potential issues. It is also important to address any strange smells or warning lights in your car promptly.

5. What should I do if I suspect my car is "gassing" me?

If you are experiencing symptoms such as headaches, dizziness, or nausea while in your car, it is important to get out of the car and seek fresh air immediately. Then, have your car inspected by a professional to address any potential fuel leaks.

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