My 2007 Expedition's A/C blows out cool air just fine. My concern is with the whining noise that emits from the a/c compressor. At idle it sounds okay. As soon as rpm's start to rise, the whining starts. Rpm's lower and there is no noise.Does this mean my a/c is about to go out? Thank you in advance.
I had a whining noise in my 08 Expy that increased with RPM's. Took it to the dealer, who checked it out and said it might be a transmission pump! However, when they actually checked (instead of guessing) they found the idler pully was the culprit. They replaced the part and now it is as quiet as it was when new.