Coolant pipes A-Z. - Page 36 - Rennlist - Porsche Discussion Forums

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Coolant pipes A-Z.

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Old 10-29-2017, 03:22 PM
  #526  
deilenberger
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Originally Posted by Jonathan Davies View Post
Great post on this issue guys. Thanks.

Can anyone help me with my specific problem?

Stripped my 4.5S down today to get to my 'obviously' split coolant pipes under the air intakes and injector rails etc. 'Obvious' because the water loss was immediate and came from the back of the engine, so I convinced myself it was the dreaded lack of the upgrade. When I got to them, they've already been done! The whole area dry as a chip! YIPEE. Can't find where the leak is tho!! BOO. Any ideas of where I can start? Any other problematic pipes at the back of the engine to cause this that anyone is aware of? Waiting for a tool to pressurise the system to make it leak and hopring to get some mirrors down there to see. Any other suggestions please? Thanks.
The coolant reservoir is also a known failure point. It splits on the seam where the two halves are plastic-welded together.

Since you have an "S" you don't have the infamous plastic T that the turbos have, but you do still have the glued in fitting in the cooling crossover manifold at the rear of the heads. That's a possibility. That manifold can be replaced without engine removal - but it's probably not easy.
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Old 10-29-2017, 03:47 PM
  #527  
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Thanks for the reply. I actually recently changed the coolant reservoir due that infamous split and a very slight yet annoying leak I've had for a few years, but that has now probably caused the system to fail at it's next weakest point - position to be determined!
Looking through this forum though, I've found someone else who has had a very similar problem as mine after the upgrade and for them it was the small flexi pipe on the end of the larger replaced pipe under the triple piece. I'll wait for the pressure tester to come and repost my findings with some pics. Thank you again. Big help.
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Old 10-29-2017, 10:52 PM
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Originally Posted by deilenberger View Post
The coolant reservoir is also a known failure point. It splits on the seam where the two halves are plastic-welded together.

Since you have an "S" you don't have the infamous plastic T that the turbos have, but you do still have the glued in fitting in the cooling crossover manifold at the rear of the heads. That's a possibility. That manifold can be replaced without engine removal - but it's probably not easy.

The 955 has a glued fitting? I thought that was only the 4.8?
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Old 10-30-2017, 04:11 PM
  #529  
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Originally Posted by 19psi View Post
The 955 has a glued fitting? I thought that was only the 4.8?
Good question. Thought it did - anyone know for sure?
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Old 03-15-2018, 10:07 AM
  #530  
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I'm looking at a 2009 Cayenne S. Has 66,000 miles, very nice condition. I'm new to the Cayenne world. Does the 2009 have the plastic coolant pipe issues? If so I may still consider this vehicle but try and adjust asking price based on having to replace the coolant pipes.

Thanks!
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Old 03-15-2018, 08:14 PM
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No. Pipes are a 955 (03 - 06) issue only.
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Old 03-15-2018, 08:26 PM
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Originally Posted by Wisconsin Joe View Post
No. Pipes are a 955 (03 - 06) issue only.
Thanks...don't know why I thought it was a 957 issue.
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Old 03-16-2018, 12:04 AM
  #533  
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Originally Posted by BMWDavid View Post
Thanks...don't know why I thought it was a 957 issue.
There is still a plastic coolant pipe and a metal upgrade is available. Fortunately the plastic 957 pipe doesn't seem to be as big an issue as the pipes on the 955.
The big concern on the 957 is the glued in barb fitting on the rear of the engine. The 955 pipes are child's play compared to dealing with that nightmare...I'm sure some bean counter at Porsche saved 10¢ per vehicle by half-assing it.
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Old 03-16-2018, 07:22 AM
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Originally Posted by 19psi View Post
There is still a plastic coolant pipe and a metal upgrade is available. Fortunately the plastic 957 pipe doesn't seem to be as big an issue as the pipes on the 955.
The big concern on the 957 is the glued in barb fitting on the rear of the engine. The 955 pipes are child's play compared to dealing with that nightmare...I'm sure some bean counter at Porsche saved 10¢ per vehicle by half-assing it.
Good to know! I'm still learning the little (or not so little!) details about the Cayenne.
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Old 03-16-2018, 02:53 PM
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Originally Posted by 19psi View Post
There is still a plastic coolant pipe and a metal upgrade is available. Fortunately the plastic 957 pipe doesn't seem to be as big an issue as the pipes on the 955.
The big concern on the 957 is the glued in barb fitting on the rear of the engine. The 955 pipes are child's play compared to dealing with that nightmare...I'm sure some bean counter at Porsche saved 10¢ per vehicle by half-assing it.

I upgraded my customer's coolant pipe while replacing the hacked vent line that blew off on the highway. Fun job for sure!




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Old 03-16-2018, 05:30 PM
  #536  
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At least the original plastic pipe appears to have some thickness to the walls. What holds the large front pipes to the t-stat housing? Tell me those aren't glued too?
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Old 03-17-2018, 05:39 PM
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Originally Posted by 19psi View Post
At least the original plastic pipe appears to have some thickness to the walls. What holds the large front pipes to the t-stat housing? Tell me those aren't glued too?
I'm not him - but YES - they're glued. There is a thread in the 958 subforum about them coming unglued. I'm planning on very soon - using JBWeld around the junction of these pipes and the housing to secure them for good. The new replacement part (started around 2014 on the V8) has pipes that are bolted into the housing. I think I can do the JB Weld without major disassembly - mostly getting the air intake Y out of the way and perhaps the throttle-body. The pipes are located right under them.
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