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Hello - I was replacing my battery and noticed a rubber tube that comes out of the fender and then was loose in the area behind the battery. What is this and where should it be routed?
Also, I could see 3 x 13mm holes at the bottom of the trunk, opening to outside under the car. One has a rubber plug, the other two do not. Should they?
Thanks
The hose is the vent tube for the battery. It is designed to vent acid fumes or liquid out of the frunk area. Early 964's came with a little plastic reservoir which I believe is NLA that trapped the liquid but they eliminated it early on. Interstate batteries should come with one port on each side of the battery. One is plugged and the other side should have a connection tube that can be switched from on side to the other if needed. If not you need to get the piece and connect that tube. It is critical. If the fluids spill out from hard cornering you will end up with acid damage from it spilling onto the frunk floor. A common problem that can be easily prevented.
Steve posted the correct drain tube parts. There should be 4 one is located under the ABS brain opposite the battery so you might not see it. This allows ventilation of fumes and whatnot out of the frunk but prevents water from entering which is important.
only 4 on yours? ... interesting. There are definitely five on my 1991 US model,.. so I just went back through a ton of old BaT auctions on these cars, and low&behold, there are some with only 4, and most with 5.
Not only is there 5 that take the drain tube,... but there is also another small outlet where mine has a small grommet too.
I just took my car back off the lift last night, otherwise I would go take a quick pic of it now.
I'm in the middle of making tweek adjustments (rebound & compression) to my new KW v3 coilovers, so later this week I'll have it back up on the lift & I'll take a nice pic of that front underbody tray showing where mine are.
Oh, & thanks for the description of that battery vent tube. I'll go check on mine now. I have a Porsche MOLL battery, so not sure if that has a side vent.
If the fluids spill out from hard cornering you will end up with acid damage from it spilling onto the frunk floor. A common problem that can be easily prevented.
The best solution is to use a modern glass mat battery
As for those vents, buy extras. They have a way of disappearing, especially if you drive across a field at a car show or something like that.
Last edited by Metal Guru; 10-17-2022 at 07:09 PM.
Hello - I was replacing my battery and noticed a rubber tube that comes out of the fender and then was loose in the area behind the battery. What is this and where should it be routed?
Also, I could see 3 x 13mm holes at the bottom of the trunk, opening to outside under the car. One has a rubber plug, the other two do not. Should they?
Thanks
my car had same holes, so its factory. Installed universal rubber plugs
5 it is, I forgot about the one under the ABS pump. All the tubs were essentially the same C2/4 or turbo.
@997 tt/rs You don't want to plug the holes completely. You need the factory plugs to vent and drain any water that might get in otherwise mold will occur. You will see mold on the option sticker usually because the drain plugs are missing or have been plugged completely.
I never take any of them out intentionally when it is raining, although weather is always changing by me. I got caught in a huge rain storm about an hour from home on 9/11 in my C2 and believe you me I am happy all my plugs were in place. It did take me a few hours of cleaning the car when I got home before I could put it away. Apparently it caught some attention and a posted a video of me driving in the rain.
Same with me. Rain happens a lot around here (not enough lately) and mine was pretty well soaked just last month during a driving weekend with some friends. I didn't see any signs of water in the frunk, but will get it plugged properly anyway. While we're talking about frunk - I've had my spare out to do all of this and have always wondered....is it supposed to be properly inflated at all time (and therefore still fit in it's space) or are you supposed to figure out a way to inflate when you're in the middle of nowhere with a flat? I would assume the former but just found mine to be pretty flat.
You should have an air-pump, tool, kit, jack, gloves and a plastic pad to kneel down on the event of a flat. Factory air pumps are stupidly expensive and not very good. Most usually are missing the tabs that hold them closed
10-16-2022, 10:29 PM
Trunk hose and holes
