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Noise when accelerating and set to defrost

Old 03-17-2009, 03:10 PM
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Join Date: Sep 2006
Location: Houston, TX
Posts: 13,050

The a/c will act as a dehumidifier and remove moisture from the air.

My 5th gen accord does not use the a/c to defrost. I didn't realize that yours does.
Old 03-17-2009, 05:09 PM
JimBlake's Avatar
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Join Date: May 2006
Location: Wisconsin
Posts: 17,419

Used to own a 1998, and when you select Defrost, it would switch ON the AC & the green lamp would light up for AC. And you could then switch it off.

But my 2003 acts the same way as yours. With the 2003, the AC runs but the green lamp is not lit. And you can't switch it off.
Old 03-17-2009, 08:03 PM
Junior Member
Join Date: Feb 2009
Location: Findlay,Ohio
Posts: 34

You could check freon but more then likely sounds like possible bearings start to go bad or gone in the ac compressor or the clutch. Considering you only hear the noise when compressor is on I would say the compressor itself is the culprit.
Old 11-19-2018, 11:23 PM
Join Date: Nov 2018
Posts: 1
Default V belt noise

My V6 EX Ciupe started making this noise too when the defrost heater was on and when rpm went over 2000. I had recently changed the V- belt to a Good year brand but just changed it again to an OEM Honda belt. No more noise. I think the noise was from the vbelt when the alternator was powering too much and the belt was maybe a bit loose being an aftermarket one.

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