Ed Petry

Hi everyone,
Hope everyone is doing well.

My 81 HVAC vacuum lines are messed up. Not routed properly, I think. I have manual temperature setting.

I looked in the WSM and here on Rennlist. Found Brad's post from April 2009. Very nice, thanks.

One difference between the WSM & Rennlist diagrams and my setup is, my vehicle does not have a violet hose running from the control to flap “A”.



My question is(are):

— is there another diagram for different years?

—is the WSM for manual or automatic control?

—does anyone have experience with the missing violet vacuum line?



Thanks.

Ed Petry

Hi,
Want to add a few pictures that may help. Thanks in advance.

Picture of the area

What is this device? A/C control of some type it appears.

picture of the spaghetti

Another view of the spaghetti

Petza914

These are photos of my '79 when I did the interior and I also made a diagram. Oriented horizontally, looking at the back of the HVAC contoller.

Ed Petry

Hi everyone,

Found out a ton (or is that tonne, as this is a German car...lol) about the HVAC systems in 80s Porsches in general and mine in particular.

I have a 1981 5-speed w/competition package. For some reason the vehicle has a manual control HVAC head and wire control for the temperature (I've heard that is not the norm for an '81 as most were either automatic and/or non-wire control for the temperature).
The vacuum hose routing is not standard and not special (took a while to get my head around that thought). There are hoses missing (violet and orange). Yet, I have more red than is specified.

The hose routing encompasses parts of the early year's HVAC and not.

I will document this vehicle's system as I go and post here so those with more knowledge can help me make sense of it.

More later.

Thanks for the help.