When my heat or air conditioning is on and the engine is at low RPM's (usually at/near idle), there is this clicking noise that is fairly loud. When outside of the car, you can clearly hear it, and it sounds like it's coming from somewhere directly in front of the driver's seat. Any idea's on what it could be?

 

does it happen while driving?
if yes, my guess is Diverter Valve.

 

While, driving as in barely moving, yes, driving as in anything above 10-15 mph, no....

 

what about downshifting? could be a mount somewhere that broke...

idk about the dv making a loud enough noise...

 

It's only when I decelerate to low RPM's. It usually isn't even when I first start the car and have the AC/Heat on. Usually what happens is i'll take off driving, then about the 2nd or 3rd light/stop sign I hit, about 10 ft before I come to a complete stop I hear this fast click*click*click*click*click noise. When I turn off the AC/Heat, it stops immediately. It does not do it at any normal driving speeds.

 

^ sounds like a belt issue

 

Any idea which belt(s) to look at?

 

^ whatever powers the AC comp./fans... uhh serpentine? see if a tensior is loose or it's rubbing on something.

 

Well, if it's dependent on the air being on or not - Google "actuator motor clicking". Warning: I have no idea what I'm taking about.

 

Hey just curious if you ever found out what this was? Im having a similar issue minus the heat/air factor im having the clicking noise only when coming to a stop and only after its warmed up