JohanvdWalt

I saw a pic of the system in the workshop manual. I can see the system in the engine bay with the vacuum pipe going through the fire wall, inside the car on the passenger side (rhd) I see the valve but the vacuum pipe is not in sight from inside the car.

What does this system do and how is it controlled.

JohanvdWalt

I found the switch in the car and the missing vacuum pipe - connected it and the valve now close when I start the car. I still want to know what it does though.

JohanvdWalt

Bump

hosrom_951

The two air valves near the glove box should be connected to two things.

1) The engine's vacuum system
2) The heater valve

According to what you say, which one is missing in your case? either way, either the air valve would not be able to create vacuum to 'open' the heater valve (thus no heat), or you would be having fume-like smells inside the car under hard acceleration (i have this problem right now, my heater valve is fine, but one of the air valves controlling it's operation is either not connected or dead).

Hope this helps..........

JohanvdWalt

Well I've sorted it out now. The vacuum pipe coming from the engine was not connected to the vacuum switch and the switch was not connected to the "heater valve"ether. I connected both now and I can see the valve opening and closing when I turn the ignition on/off.

The heater use to work fine without it though so I'm not convinced that it is a heater valve.

I think / hope it might rather be a recirculation valve but I'm clueless.

hosrom_951

Let the PET system guide you to 'which one goes where'.

blargonator

i am having trouble finding where some of the cables to the vacuum boster go. could you take a pic of the finished job or something?