So, I have a brand new control unit. But my vents will not work, air only blows out of the defroster. I know this is the default position due to a faliure somewhere in vacuum? I checked under the hood and the vacuum line going into the harness is properly attached. But, on the back of the control unit itself, the diaphram with all the tubes going to it is leaking around the middle section. Could this be my problem? If so, where can I get another diaphram with tubes like that, that does not leak??

 

Yes. I replaced the switch itself under those circumstances and all works well. If the unit is brand new (switch and all), I'd fuss a bit.

JamesC

 

Well only the dash inserted Control unit itself is new, not the vacuum tubes behind. Is there a way to splice on a new diaphram with leads? Where could I get one??