iamrolling
New member
- Joined
- Nov 5, 2019
One of the first things I did with my 93 940T was replace the unsightly vacuum lines. Not having any idea what I was doing, I used heater hose from AutoZone on all the connections. It didn't do so well on most of the connections. The lines on the turbo turn into plastic, and the 4mm PCV hose becomes soggy at the manifold side.
I'm sick of replacing those lines, and want to do the job correctly. I'd love to replace everything with silicone because it would look really cool, but on about half of the connections I'm afraid they'll fail the same way as the heater hose. I'm going to describe my plan here, in case I missed or have the wrong idea about something:
Silicone hose (for heat resistance):
Both 4mm hoses on the turbo
Airbox to turbo/PTC hose
Turbo to intercooler pipe hose
SAE 30R6/7 fuel line (for surviving oil and fuel vapor):
4mm FPR vacuum hose
4mm and 8mm PCV hoses
4mm and 6mm charcoal canister hoses
9mm brake booster hose (so many potential oil leaks around it to use silicone)
4mm hose on boost gauge (I wanted to use silicone but it's too thick to make it past the firewall)
Leave stock (seems to last forever):
All other intercooler connection hoses (see too much oil for silicone)
IAC hoses
3mm hose on cruise control module
PCV to PTC line
All nylon lines
I already know it isn't going to look good at all. And I'm going to make it worse by using blue silicone tubing because it's the most commonly available color.
I'm sick of replacing those lines, and want to do the job correctly. I'd love to replace everything with silicone because it would look really cool, but on about half of the connections I'm afraid they'll fail the same way as the heater hose. I'm going to describe my plan here, in case I missed or have the wrong idea about something:
Silicone hose (for heat resistance):
Both 4mm hoses on the turbo
Airbox to turbo/PTC hose
Turbo to intercooler pipe hose
SAE 30R6/7 fuel line (for surviving oil and fuel vapor):
4mm FPR vacuum hose
4mm and 8mm PCV hoses
4mm and 6mm charcoal canister hoses
9mm brake booster hose (so many potential oil leaks around it to use silicone)
4mm hose on boost gauge (I wanted to use silicone but it's too thick to make it past the firewall)
Leave stock (seems to last forever):
All other intercooler connection hoses (see too much oil for silicone)
IAC hoses
3mm hose on cruise control module
PCV to PTC line
All nylon lines
I already know it isn't going to look good at all. And I'm going to make it worse by using blue silicone tubing because it's the most commonly available color.