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Anyone have replaced coolant pipes with metal and then have them fail?

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Last week went into the garage, and saw pool of coolant under the driver seat area on garage floor.  
Now, thinking it could be the T connections (two of them, one small T and another large T), that are plastic, extremely hard to get to, and fail routinely.
Took the intake out, looking in and observed some coolant near/under the starter area (under left or pass. bank of cylinders), under the pipes near the thermostat area, also see some coolant under the right bank of cylinders, inside the V of engine.
Did not really see much wetness near back where the T connectors are.
Planning to do a pressure test when my tool comes in (hoping tomorrow).

Looking for folks to look over the pics/vid, and tell me if they see suspect info that can make PD easier or direct to an area.
Placed my pics on google drive HERE.  Look through (sorry, was taking valves condition pics too, while i was there, seem to look good).
Thank you for help.

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When my coolant Ts blew up (the two to the back right of the engine against the firewall) yes there was coolant sprayed everywhere, and some made it into the V of the engine. There's also that bleeder hose which is prone to becoming brittle and cracking which would dump coolant there, although yours looks ok. 

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19 hours ago, nerdtalker said:

When my coolant Ts blew up (the two to the back right of the engine against the firewall) yes there was coolant sprayed everywhere, and some made it into the V of the engine. There's also that bleeder hose which is prone to becoming brittle and cracking which would dump coolant there, although yours looks ok. 


Are you talking about the long thin, black hose looking like a number 4, going from rear of engine bay, to front of it, connecting to each side of the intake?  That one was replaced by the repair shop about 2 years ago.  Contemplated replacement, but touching it, does not appear brittle at all.


Now, I am looking for a place where I can order all the o rings and rubber pieces for the coolant pipes, plus gasket for thermostat housing.  Dont need pipes, just the seals/gaskets.


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...so, have intake off, pressurized system, found leak. Large T. Still puzzled why some coolant was in valley of engine. Could the large T breach and spray some into it? 

Aluminum Ts and OEM hoses already on way.  Thinking of replacing O rings on pipes just in case but few folks told me they will be fine if recent (which they are).  So split on that decision.  Was also thinking reseat thermostat pan, but it looked dry there and feeling under the coolant pipes going to thermostat I did not feel any moisture on fingers, and did not see any moisture on pipes with a plumber snake camera.


Edited by ciaka
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Here are my new replacement Ts, from JagsThatRun.com. They charged me $24 per each T, shipping $10 to country of Texas, total $58 delivered within about 4 days total. So turn around was super quick and I am super happy.
Also ordered OEM hoses that include the plastic Ts. Will remove hoses from those Ts, and install on the metal ones for installation onto the car. Then will do the pressure test again to make sure no other leaks are there, and then onto putting all back together.
Ordered from here in case you have same issue.


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Gents, here are my old pipes for you to stare...lol. Still waiting for oem hose Ts to arrive, so I can put it all together, but at least got to the leak. There was some coolant in the valley, but some told me their large T burst resulted in coolant in valley too. I hope he is right. In mean time, let me know if you spot anything i should be looking at replacing in pipes area (seals, misalignment, etc). Thank you.


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As an update, the large T (part of a water hose assembly), made of plastic, cracked right at the T junction, underneath the part of hose slid over the plastic and clamped.
There are two Ts on Cayenne Turbos, large and a small one. They are both made of hard plastic. This means, after 40 or 50k miles of replacement with new parts, you will be back in there, replacing yet again.
To remedy this, I ordered two aluminum Ts, meaning I will never have to worry about the Ts leaking again.
Adding to the crack, I also noticed that the large coolant pipe water hose (short and large rubber hose connecting the large coolant pipe with 2 clamps), was leaking at bottom as well. This was discovered after i replaced the Ts, and did a pressure test on coolant. The problem revealed itself right away.
I am waiting for some parts, as I am now replacing all seals on all coolant pipes. It turns out my Porsche dealer had these parts much cheaper than any other place I found it at online. So check dealer near you first. Parts will be here in 2 days.

Parts I ordered for the fix of broken Ts - 05 Cayenne Turbo:
- Water hose - PN 955 106 322 00, qty: 1 - water hose connecting to left most (passenger side) small cooling pipe with clamps
- Water hose - PN 955 106 323 50, qty: 1 - water hose with plastic Ts (large) - cut off metal clamps, put onto new aluminum Ts, use steel clamps
- Water hose - PN 948 106 035 51, qty: 1 - water hose with plastic Ts (small) - cut off metal clamps and put onto new aluminum T, use steel clamps
- Aluminum T (large) - 1" x 3/4" x 1" - Order Here
- Aluminum T (large) - 3/4" x 3/4" x 3/4" - Order Here
- Hose clamps large and small - Orileys or your favorite auto parts store

Other parts:
- Intake gasket - PN 948 110 145 01 - Qty: 2 (one for each bank)
- 2FT Flexible Wire Long Reach Hose Clamp Pliers - I would not attempt this without these pliers as some clamps are so deep and tight they cannot be reached with anything else - about 15 bucks off ebay

After discovering leaking cooling pipe seals, I ordered the following seals to replace:
- PN 999 707 517 41 - Qty: 4 - for small cooling pipes seals
- PN 999 707 518 41 - Qty: 2 - for small cooling pipes seals - the driver side pipe
- PN 999 707 370 41 - Qty: 4 - for large cooling pipe (2 seals for end going into thermostat and another 2 seals for adapter going into large pipe)
- PN 948 106 240 00 - Qty: 1 - short water hose joining large cooling pipe to water housing
I reused clamps for the short water hose, but if you want to buy one, PN is 999 512 389 01.
My local dealer happened to have all the seals for much cheaper than anywhere online I could find them, had most in stock, and others would arrive within 2 days.
So I hope to have this sucker back working this coming weekend.  It would be sweet, still very much enjoy driving this car.

Here are the pics of pipes ordered, on the metal Ts, and what my hand looked like after completing the swap. Now you should understand why you would need to get cable pliers.


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