jstyer

Does anybody have a C2 vacuum diagram? Non-varioram would be best... But varioram would work as well.

Tore used to have one on his site, but the link no longer works.

Any help would be awesome.

Thanks again,

Justin

ToreB

Hi, thanks for pointing out the broken link. It is now udated, see bottom of pagehere..
Cheers,
Tore

jstyer

Awesome tore. Thanks.

So looking at the diagram, the fresh air flap, and brakes are the only vacuum lines sent forward from the engine bay. Correct?

ToreB

The diagram can be somewhat confusing. There's two vacuum operated ventilation flaps in the 993. Resirc flap (item 32) and the fresh air switch-over flap (3c) in the engine bay. The first is a known source for ventilation air flow problems, and the latter selects the air intake depending on if you put the car in reverse or not, and not very critical for ventilation functionality.

I have never looked at any vacuum hoses to the brakes, so I can't comment on that.

Cheers,
Tore

Bill Verburg

Here's one I wrote some notes on.

jstyer

Great info guys.

I've already eliminated the functions related to the rear blower motor. I'm switching to manually controlled heater/ventilation functions, as well as a non assisted dual master cylinder brake setup. So it looks like I'll be able to completely remove the vacuum lines that go foward.

(With the exception of the fuel tank related lines)

Ivan J

Thanks to Bill Verburg for this diagram

The recirc flap for my HVAC system gets sucked closed by the airflow when I accelerate. I think that the inline check valve (the upper instance of #8 in the diagram) might have failed. Can anyone show me where this check valve is located?

On a related note, there is a black and white plastic valve that connects to the intake manifold, which I think is a check valve. It is located in the center of the photo below. Mine seems to be failed closed, I can't blow air through it in either direction. Which valve in the diagram does this correspond to?