A squeaking sound has started, it only happens when I turn on the AC/Heat. It squeaks faster if I crank up the dial. It does not vary in speed with the speed I am driving. It does, however, vary on it's own occasionally. It sounds like a sad belt or sometimes a sad motor.

What is the problem and how much should it cost to fix? 2006 Mitsubishi Galant 6 cyl

 

Also, if it could be more than one thing, how do I isolate it down to one thing so I can get pricing information? Thanks in advance for your help. -hamilton456

 

I got the same EXACT problem...defrost/heater...squeal...? What is it, I've tightened the belt too tight, retightened looser, then back...cant seem to stop it, it didn't do it off the showroom floor so what has to be replaced! I've been told idler pulley, and told alternator...cant be both

 

I had the same problem with my car.. my A/C compressor
clutch pulley was worn out, I replaced it, the sqealing noises
went away.

 

Do I HATE this stupid site that times me out within minutes!!!! I may go to another DSM...I'll try to duplicate my response.

What dial do you turn up? If it is for the fan speed and the squeaking gets faster, it is the fan motor. If the squeaking increases with engine speed, it is a belt/idler or the accessory that is being driven by the belt. Try to loosen or remove the belts one by one, restart the car for a short time to see if the noise stopped. Continue doing this until the squeaking stops and you have identified the source,