I am getting a sort of humming noise fro the A/C control unit. Symptoms are that when you start the car you get this humming sound from a/c. I have the temperature set at 24 these days. The blower A/C doesnt control the blower accordingly. After the car has been running a while the blower works more efficently with the A/c. I thought it was the blower and replaced it but thats not the case. Is there a temperature sensor connected to the A/C which could be on the fritz? Its like it takes ages for the A/C to detect what temp the inside of the car is and blow accordingly. Any ideas guys?