Re: vaccuum hoses where should they go?? (archive)

The hvac recieves vacuum from the intake manifold. There should be a line connecting to one of the nipples on the intake manifold on the underside of it. This line has a simple check valve in it, I think blue to prevent air from going back into manifold. The line then tees into the line from the vacuum pump on the DS strut tower. he tee is near the firewall, then continues over to the PS and into the resevoir. The vacuum pump is designed to kick in when you start up or when the engine speed can't supply enough vacuum for the HVAC system. I learned all this from members of this board. So hope this helps,
Aaron Wyatt
I have just about fixed my HVAC system. Found the leak and am now about to reploace the burnt out electric pump. Before I do I need to know what the vaccuum control valve looks like. When the engine turns off the vaccuum in the reservoir leaks straight back out into the engine.
The vaccuum lines looked like a dogs breakfast. At the moment I have vaccuum going direct from manafold to reservoir - obviously not right. I have pulled the burnt out pump out.
Under (I think) the fuel inkection maifold there is a vaccuum hose, what should it run to?? I would really appreciate some help with checking the motor vaccum lines. It is a 1983 735i

Thanks Martin

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