CTT leaking antifreeze from rear of motor, with coolant pipe upgrade.

[Mr.Flip]

For about a month now my cayenne would leave some antifreeze on the ground, at first it was a little bit but now it's more like a small puddle. Parked it on a hill with the splash guard off and saw that it was leaking from the drivers side rear of the engine. Automatically fearing the infamous "plastic coolant pipes" fault in these, I went ahead and removed everything to see if it has been replaced or not(owned the car for 10 months). To my surprise (and relief) it has been. My question is this, is there any more common spots that it can leak out other than the coolant pipes in the middle of the engine? My car is a 2005 Cayenne Turbo with about 134,000 miles. Thanks in advance!

 

 

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[nerdtalker]

On the turbo there are two plastic T joints between the firewall and the back of the motor that feed coolant to the turbochargers. Those crack/split and fail. One of mine developed a pinhole fissure and sprayed coolant and made a huge cloud of steam. I guess that's another common failure mode. 

[Mr.Flip]

On the turbo there are two plastic T joints between the firewall and the back of the motor that feed coolant to the turbochargers. Those crack/split and fail. One of mine developed a pinhole fissure and sprayed coolant and made a huge cloud of steam. I guess that's another common failure mode. 

Dang. How hard was it to replace them? I think I may have found my leak, the adapter piece thats part of the upgrade had antifreeze baked around the seal of it. Granted it doesn't look like that now because i sprayed WD-40 to try to get it out.


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[Bluetoff]

I had a leak on my 2005 cayenne s from offside rear of the engine but more from under the wing. It was found to be coming from the header tank which is apparently a common problem on that year. It was badly split on the seam. Changed and all fine now. 

[Mr.Flip]

I had a leak on my 2005 cayenne s from offside rear of the engine but more from under the wing. It was found to be coming from the header tank which is apparently a common problem on that year. It was badly split on the seam. Changed and all fine now. 

I had that problem a few months back, swaped it out and it was fine too. Until now.


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[sunlion]

be careful replacing the coolant pipes......sometimes the seals get kinked and they continue to leak fluid.  If you start seeing tranny fluid leaking after a while, then the transmission seal is shot - it get fried because of the coolant. The tranny needs to be dropped to change this seal. 

[hahnmgh63]

And as nerdtalker said, the two T's at the back of the engine are a pain to replace but just as likely to crack as were the plastic Coolant pipes. They are tough to replace but either replace them while you're in there with new stock pieces (fairly cheap and come with hoses attached) or install some Stainless T's as the plastic ones will fail again someday.