What sizes vacuum tubing for a 1994 960?
#1
03-09-2019, 05:17 PM
What sizes vacuum tubing for a 1994 960?
1994 960 sedan 199K miles. I went under the hood looking for a vacuum leak because my climate control system just started switching the flow from the dash vents (which were selected) to the floor vents every time I gave it any throttle, basically any time other than idling.
Well I found the source. A hose had slipped off of a smooth nipple on one of the control valves next to the firewall. In addition I found an answer, sort of, to my earlier question below about vacuum tubing sizes. I discovered that instead of soft rubber tubing, there are hard plastic hoses which are color coded for the different vacuum circuits, with small sections of rubber tubing attached to both ends of the plastic hoses to connect the ends to nipples on vacuum ports. The rubber ends are molded or attached to the ends of the hard plastic vacuum hoses. The rubber ends look like a standard size less than 5 mm ID perhaps 3 mm ID. I suppose one could purchase soft rubber or better yet silicone vacuum tubing to replace the plastic/rubber ended vacuum lines completely, but the original hard plastic vacuum lines look very robust to me. At least mine aren't showing any signs of failure yet. I didn't even find that any of the integrated rubber tubing sections at the ends of the plastic vacuum hoses were cracked or leaking. But it's a different setup than I've seen on a car before, and frankly this looks more robust that just rubber lines end to end. Much better for the hot engine compartment.
Original message FWIW:
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I want to basically replace all of the vacuum tubing under the hood/bonnet and also that feeding to the inside of the car, where vacuum is used on the climate control system, with silicone tubing.
What sizes mostly do I need? I see silicone tubing in 10 foot lengths commonly available. But before I spend between say $15 and $20 per 10 foot roll, at least one roll for each size, I want to ensure I get what I need and especially no size that I do not need.
Also did Volvo use metric size tubing and do I need that for the best fit in some cases? I know how to convert SAE/Imperial to metric and I know a few sizes that are nearly identical between the 2 systems. I just thought if someone else out there had already done this job, I would like to benefit from the time you spent figuring it all out.
Thanks.
Well I found the source. A hose had slipped off of a smooth nipple on one of the control valves next to the firewall. In addition I found an answer, sort of, to my earlier question below about vacuum tubing sizes. I discovered that instead of soft rubber tubing, there are hard plastic hoses which are color coded for the different vacuum circuits, with small sections of rubber tubing attached to both ends of the plastic hoses to connect the ends to nipples on vacuum ports. The rubber ends are molded or attached to the ends of the hard plastic vacuum hoses. The rubber ends look like a standard size less than 5 mm ID perhaps 3 mm ID. I suppose one could purchase soft rubber or better yet silicone vacuum tubing to replace the plastic/rubber ended vacuum lines completely, but the original hard plastic vacuum lines look very robust to me. At least mine aren't showing any signs of failure yet. I didn't even find that any of the integrated rubber tubing sections at the ends of the plastic vacuum hoses were cracked or leaking. But it's a different setup than I've seen on a car before, and frankly this looks more robust that just rubber lines end to end. Much better for the hot engine compartment.
Original message FWIW:
---------------------------------------------------------------------------
I want to basically replace all of the vacuum tubing under the hood/bonnet and also that feeding to the inside of the car, where vacuum is used on the climate control system, with silicone tubing.
What sizes mostly do I need? I see silicone tubing in 10 foot lengths commonly available. But before I spend between say $15 and $20 per 10 foot roll, at least one roll for each size, I want to ensure I get what I need and especially no size that I do not need.
Also did Volvo use metric size tubing and do I need that for the best fit in some cases? I know how to convert SAE/Imperial to metric and I know a few sizes that are nearly identical between the 2 systems. I just thought if someone else out there had already done this job, I would like to benefit from the time you spent figuring it all out.
Thanks.
Last edited by va740twagon; 08-04-2019 at 10:31 PM.
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