Hi All,
I have a knocking sound from behind my glove box. It is not the blower fan.
It starts as soon as the key is turned. If I press the auto button the knocking stops. The knocking will continue if the fan is in econ or turned off. (automatic cluster)
any help would great...

 

it's ghosts i tell ya...

sounds like a mechanical malfuction in the ducts. i wish i could be more specific but i'm just taking a stab. there are moving parts inside there that open and close depending on what the cc is set to.

 

ya that would make sence, because when lower the deg. in auto it will start knocking again. Is their a second fan for the a/c ?

 

One fan, on left side there's a flap actuator which is possibly jammed: ask Pyrophilus how he solved his problem; he has got also pics.

 

It's a gremlin trying to get in the cabin!!!

 

Somebody is at the door.....Answer it.

 

I think maybe stepper motors on evap box. I remember when I took out my acc unit. There was a contol wire attached to it that went back to the evap box. Maybe that could be it.

 

mine did the same thing for about a year-18 months..when that started, I got stereo to cover it up...its worn itself, whatever it may be, to a point that if its really quiet you can kinda hear somthing with a slight rotational squeek.

When it started, and still made the tapping sound, you could play with the a/c and heat settings all you want, fan speed, whatever..the only thing that changed it was turning the resurculator on would slow it down a LITTLE bit.

I just let the gremlin beat itself to unconsiousness.

 

Had a noise when blower went on, caused by a small branch that slipped into the vents at the base of the windshield. It went through a number of sound variations(as the blower motor wittled it down.