porsche_addict

I was removing the battery to charge it and clean the terminals and noticed a small round black bottle to the left of the battery. There is also what looked like a small vacuum hose sitting disconnected next to it. What does this container do on a 1986 951?

m73m95

Its the vacuum canister for the HVAC system. Hook the vacuum line back up to it.

n_hall

It stores vacuum. So while you're accelerating you have enough vacuum to keep the heater working.

At least that's what a Porsche mechanic told me.

porsche_addict

Well that might explain why the climate control doesn't regulate the temperature correctly. I thought that all the HVAC doors and flaps were servo operated?

m73m95

The doors are, but the temp control is vacuum operated.

gux944

yeah... just plug it back....lol