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The TSB "coolant pipe remove/reinstall" states "labor time 100 TU"---what does 100TU translate to? I think I read somewhere that It's a 4 1/2 hour job.

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100 Time Units is one hour.

But be sure and realize that this time quote may not include the disassembly required to get to the coolant pipes. Read all the times and add them up.

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The TSB "coolant pipe remove/reinstall" states "labor time 100 TU"---what does 100TU translate to? I think I read somewhere that It's a 4 1/2 hour job.

What year did they switch over to the metal ones? Thanks....GR

Edited by GR997S

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The TSB "coolant pipe remove/reinstall" states "labor time 100 TU"---what does 100TU translate to? I think I read somewhere that It's a 4 1/2 hour job.

What year did they switch over to the metal ones? Thanks....GR

Per the TSB plastic pipes were used on MY2003 through MY2006.

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The factory has never changed the water pipes from plastic to metal ones during the production, these were intended only as the ultimate upgrade for V8 up to MY06 with indirect fuel injection. From MY08 V8 with direct injection, they are still made from plastic, but a different design. Maybe it will surprise that MY07 is missing, that's because MY08 ( VIN) is delivered early 2007. This fact will affect the purchase/sale price in some countries depending on whether the VIN MY or the date of entry into service is applicable, if the purchase prise is linked to the entry into service date there is no problem, in the other case (per MY) the car is too expensive under certain circumstances, for example MY08 delivered early 2007.

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The factory has never changed the water pipes from plastic to metal ones during the production, these were intended only as the ultimate upgrade for V8 up to MY06 with indirect fuel injection. From MY08 V8 with direct injection, they are still made from plastic, but a different design. Maybe it will surprise that MY07 is missing, that's because MY08 ( VIN) is delivered early 2007. This fact will affect the purchase/sale price in some countries depending on whether the VIN MY or the date of entry into service is applicable, if the purchase prise is linked to the entry into service date there is no problem, in the other case (per MY) the car is too expensive under certain circumstances, for example MY08 delivered early 2007.

So I just bought a CPO 2009 GTS and from what you are saying it still has plastic pipes. Why didn't they just use the metal ones that appear to be everywhere now, If they are still plastic, how reliable are the later models with them? Thanks....GR

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DFI engines tubes are different in design and dimensions, maybe they are more confident in it. The older Cayenne's kept around 100.000 Km.

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Of the 20-or-so coolant pipe threads that appear weekly, I thought this may be the best recent thread to reply with a question. If I should start a new thread please advise.

So, yes, the time has come for my 2008 CTT to have its pipes replaced. I didn't have the "sudden loss", but a gradual leak.

That coolant is smelly, greasy nasty stuff! I haven't washed my Cayenne in a month or so (why bother in Boston, right?) I finally broke down the other day and washed. I noticed that the coolant has left tiny orange/yellow dots all over the rear tailgate/hatch.

Now to the root of my question...

Will Porsche factory warranty honor any ancillary repairs resulting from these pipes failing?

I have heard of premature failure in the tourque converted seal, starter failure etc. not to mention that this has now probably compromised the clearcoat paint at the ***-end of my Cayenne.

Does anyone have any experience with getting Porsche to acknowledge that there are side-effects to these pipes failing?

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Coolant loss on MY 2008 (DFI) Cayenne is usually caused by a leaking water pump/thermostat housing.

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