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YOUR RESEARCHVacuum diagram - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Fill often
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Performed · outcome unconfirmed
Looking at the receipts, there has always been a slow coolant leak as it was filled often.
Vacuum diagram - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Fill often' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'valve #12' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Fill often' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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As I searched these threads, I think that when the transmission was replaced, that the SAI vacuum lines weren't reconnected properly.
Vacuum diagram - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace 5 years back, and the ims was not done
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The transmission of this car had already been replaced 5 years back, and the IMS was not done.
Vacuum diagram - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace with new vacuum line
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Vacuum diagram - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use electric tape
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Performed · outcome unconfirmed
(currently broken so I used electric tape to cover hole for now)
Vacuum diagram - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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Generation: 20261026T133652Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Anyone have any pictures of the vacuum lines on a 2000 2.7 with tiptronic? Half mine were missing and I can't find any pictures of the entire system
Thanks
Sort of like this:
Don't get wrapped up about 3-way & 4-way connections. What matters is what is connected and what order they are connected in.
One source for SAI, flapper, and transmission cooling line.
Vacuum reservoir
Changeover valve to flapper.
Changeover valve to SAI valve.
Changeover valve (23) to water valve (12).
One source for Fuel pressure regulator.
One bigger source for brake booster vacuum with venturi tube:
Simple. Ask questions from there. Need more labels?
99 2.5 Tiptronic // My 1st Porsche
So I went to clean out the throttle body, since I was already replacing the AOS and coolant reservoir tank. I wasn't aware of the SAI vacuum lines when I started and only noticed them as I was putting the TB back together. I was able to figure out where 3 of the 4 connections went, however as I continued to search, the 4 way adaptor snapped. I still can't figure out where it is supposed to go.
I drove the car from Houston to Atlanta, I didn't notice much problem. Since then the car has been sitting until major maintenance has been completed. It was passed on to me from my family, so I know some history of it.
I have been doing some maintenance things, and prior to all of this I have noticed a coolant leak coming from the heater valve (12), and was planning on taking it to a local shop to have that part replaced to fix that suspected coolant leak. The transmission of this car had already been replaced 5 years back, and the IMS was not done. RMS has been done. Looking at the receipts, there has always been a slow coolant leak as it was filled often. Hence my reason to replace the reservoir tank as I read it to be a common problem.
As I searched these threads, I think that when the transmission was replaced, that the SAI vacuum lines weren't reconnected properly. Is it possible, that if they weren't connected correctly that it is causing the heater valve to leak coolant as the valve won't close due to no vacuum? The coolant leaks immediately after starting the car, but not when off.
Any other long term effects I should be aware of if the vacuum lines aren't correct?
I am not sure how the vacuum lines should go, I posted a pic of how I replaced them on my best assumption. Seeing if anyone could give me some input before I drop it off at the shop soon. Thanks!
How I routed the lines for now 1. passenger intake coupler, 2. canister, 3. electric change over valve, 4. ??? (currently broken so I used electric tape to cover hole for now)
My broken 4 way adaptor
(12) 928.574.573.03
Been trying to follow it, however is part number 18 above two different switches or just one? I am assuming two, but I can’t find where the 2nd (18) is located.
A coolant leak would not be caused by a vacuum leak. A part which contains coolant is faulty, most likely the valve #12. It's not an uncommon fault these days.
Here's your pic with some comments.
and here's a picture of a kid mashing roots at a small village along the Rio Patuca ~1994.
The vacuum opens and closes the valve based on electrical input to the change over valve. It's been a while since I had the valve in hand, but if I remember right, the valve is open (flowing coolant) by default and is closed by vacuum. It could be the other way around. The point is that the vacuum just opens and closes the valve (928.574.573.03) and any coolant leaking would not be from the vacuum system, but from coolant flowing through the transmission heat exchange system.
Here's a small ship, coastal oiler I think, in Cap Hatien harbor:
Thanks everyone, I removed the pump and from there was able to squeeze my hands in between the manifold to attach the vacuum line to the switch under the manifold, the line was missing. Now all replaced with new vacuum line.
This is a source reference. Confirm exact model applicability in the original material.
