It might be several things. The final stage module unit sends a pulse width modulated speed signal to the fan motor, and I have seen that module cause the fan to make noise. It might well be the fan. There might be a noise from the expansion valve. I also feel compelled to point out that cyberspace is not good for noise diagnosis, I cant hear what you hear, if you get what I mean.
Monday, July 26th, 2010 AT 4:14 AM