We have a sort of "whirring" noise that begins when the blower(cold air circulating interior fan) kicks on, and lasts for about 1-1 1/2 minutes. The blower then continues to run relatively quietly for quite a few minutes. There doesn't seem to be negative impact on the cooling function. This has been going on for 2+ months with no change in sound or duration. I'd appreciate a diagnosis and info on possible DYI repair. Kent