I purchased some spiffy silicone vacuum hose to replace the aging lines on my '93 940 Turbo. It was pretty straightforward except in 2 cases:

1. Where does the vacuum hose running from the intake manifold through the firewall terminate? Under the dash? Is this accessible?

2. While tugging on one of the hoses, my hand slipped and broke the vacuum line that connects to that white check valve for HVAC on the firewall. This line is a solid black molded plastic with rubber connectors on either end. Is there a reason this is hard plastic? Can I just use a silicone or rubber hose here too (assuming it is a tight fit with the correct inside diameter?)

Thanks,

Chris
'93 945T (176K)