Art20c

For some reason, it seems that I cant find vacuum actuators for HVAC system. Im searching web using PORSCHE VACUUM ACTUATOR words, but nothing comes up. Anyone can suggest where to find them?

Another question: should air blow thru central vents constantly, no matter what position of air distribution is chosen? What I got is that flow of the air from central vent is changing just a little bit when I switch air direction to, lets say, windshield.

87 S4 Auto.

Leon Speed

Art, Roger at 928srus has them. The air direction should blow thought the central vents at all times, but much less when you change direction. Maybe your mix flap actuator is out, or - hopefully not - your defrost flap actuator. Best to check by putting a vacuum pump on all five vacuum lines.

Andre Hedrick

Check for a floating ground on the actuator bank, I had this problem and used a 1a slow blow fuse (paranoid) to pull them to ground. Only thing now is that my heat does not work except for defrost mode, so I suspect I have one bad unit there.

ROG100

Yep all in stock and ready to fly 8>)
Recirc diaphragm is $10, Center & footwell diaphragm are $37.50 each.
Defrost is $46.95.
Roger

Art20c

Roger, is it complete actuator or just replacement diaphragm? How hard to replace the diaphragm in actuator??

ROG100

Replacing the diaphragm is the easy option. To replace the actuator you have to drill out all the rivits.
Just remove the top of the actuator and replace the diaphragm.
Plenty of tutorials to show you how. Also you save a ton of $ over the price of the complete actuator.

Fogey1

Can I presume you have the diaphragms, too?
(Diaphragms - now there's a word you have to think about to spell as you type.)

will

nosnow

Diaphragms are easy enough to replace but speaking from experience TEST several times before you reinstall the actuator

ROG100

Hi Will,
See post #4 for the info.
Roger

Art20c

Hi Roger,
Im looking for some other parts for my 87 S4 besides the footwell diaphragm. Let me know if you have air box straps (4), heater control valve (1).
Regards,
George

Fogey1

I asked Roger whether he had the diaphragms, too, and ...


Oops. DOH!! Ouch, that hurt. I try to pay actual attention.

I'm almost afraid to ask: What do the complete actuators cost? I'm guessing

ROG100

Hi George,
Heater Valve is $22.95 and the straps are $36 each,

Will,
Center actuator is $80 and the footwell is $65.

Art20c

Roger, what shipping to Brooklyn, NY 11235 would be?

dr bob

Get just the diaphragms. Once you get in there, you'll see that putting diaphragms into the old cans while still mounted is so much easier than trying to R&R the whole thing. Trust me.

ROG100

George,
$6 to $11.50 Priority mail. Depends on how much you buy 8>)
Roger