teslagadget
New Member
hello all, My 1999 tahoe has a noisy coming from the hvac under the dash. It sounds like a blend door opening and closing. I first noticed it when the circulation button was on with the fan off. sounds like a door is opening and closing and it happens about 2 times a minute. If i turn the circulation button to the off position it will only make the sound every once in a while. Now if the the feet blower is on to max setting there will be no sound at all. When the the a/c is on max and circulation button on you can here the cfm get high then drop then build again. Im not sure if there is a vacuum leak to the blend door or if there is a sensor that needs replacing. Also the 4th setting on the blower fan isnt working. All other settings work fine but the 4th isnt working at all. thanks matt
