A/C makes Knocking Sound in Warm Weather
 

I bought a 2008 Honda Fit last winter. I just realized as the weather is getting warmer, the A/C makes knocking sound every time I turn it on. It only happens when outside temp is higher than 80. I am planning to take it to dealer since the car is still under warranty but I am wondering if others have similar issues.

Thanks

your a/c makes some noise when it turns on/off... so you're saying it's a different sound than when it was with the defroster turned on? cause the a/c turns on while in the defrost mode.

When it's warm, if I turn on the a/c or defroster, the knocking noise will come interminently. When it does, the a/c does not blow cool air. My first thought was the compressor, but it seems the sound is coming from the firewall area.

im having the same exact problem? is there a fix or can i just take it to the dealership, my fit does have a salvage title is it still under waranty??

Try just running the A/C during the winter months. Oh, wait a minute...

salvaged vehicles are no longer covered by honda's warranty. but the a/c is supposed to make noise so unless it's a LOT of noise or the a/c isn't working, there isn't really a problem. also, the noise you guys are hearing might just be the a/c kicking on and putting more strain on your engine at idle speed.

A/C noise
 

Re:07 Fit ~ My a/c compressor has been making noise since last summer but every time I bring it to the dealership, no noise. What else is new?

The dealer found out that there is too much freon/pressure in the compressor. The warm wether cause them to expand even more pressure making the knocking noise to the compressor. In this case, I was lucky the compressor is able to witstand such amount of pressure.

The dealer evacuate and recharge the compressor according to spec. Problems solved.

Please let this be the answer
 

I have been parking my 2007 Fit sport for the last 2 summers because of this. Please let this be the fix.