Lemming

There are two vacuum lines coming from the cabin into the engine bay (below the battery). I'm assuming that these are for the heating and cooling controls, does anyone know the routing?

RajDatta

I will give it a look tonight. You are talking about the blue and the orange vaccum lines, correct.
Raj

Lemming

I believe that those were the colors, mine are long gone but am trying to put things right.

RajDatta

Sorry for the delay but here it is:
Red line-->splitter-->blue check valve-->heater control valve
Blue line-->splitter-->Fuel pressure regulator-->intake manifold

Hope that helps.
Raj

Lemming

Big help, one last question, which is the upper and lower vacuum hose on the firewall. I currently do not have lines on the nipples, so I don't know if the upper is red or blue

Madridcab

Just what I was looking for ( I think). Is this the blue check valve that is located on the firewall (engine side)? Mine is split (which I guess is not good for heater control nor for vacuum) but I have not been able to locate it in the PET. From the blue check valve it goes through the firewall and connects to a black round "thing" in the battery compartment, next to the horn. Does this make sense, and would anybody have a part number for this? (has VDO written on it)

Madridcab

Never mind, just looked at the line to the HCV, and it was cut behind the cam belt cover, so I guess a need to seriously check the vacuum lines.., I guess this could explain some slight hesitation on acceleration I had been noting??

KTS

RajDatta

Do you still need the part number for the check valve?
If so, here it is:928 537 361 02
Its on Illustration 813-25
Raj

Madridcab

Thanks, found it.. Circuit is cut open both to vacuum reservoir, as well as to the HCV. Would this vacuum leak impact engine performance?