In my 2003 Civic EX coupe this morning, I noticed some fog blowing from the A/C vents. It still blows cold and only does this for about 10-20 seconds at a time and will then stop. I'm guessing there might be a thermostat or pressure valve that is malfunctioning.

Has anyone else experienced this? How did you diagnose the cause of the problem? Thank you in advance for any replies.

 

humidity. i wouldnt worry about it. its just water

 

chawski is right, if conditions are right, when the compressor cycles off and then back on, some of the humidity that the a/c evaporator removes from your cabin air is released back into the stream as water vapor. Nothing to be concerned about.

 

Thanks for the replies. When I saw the fog I thought "How much is this going to cost?" Glad I don't need to worry about it.