Different design between the 991.1 and 991.2 coolant pumps. And if that is the case, why did they extend the warranty to 10 years on the 991.2 coolant pumps.

 

What's different : the 991.2 has a vacuum line?
I have no idea why they've extended the warranty,maybe it's the newer car...? I don't know...

 

By the way,just so that we are clear : all that the vacuum actuated water pump does is control the flow rate of a mechanical water pump. So it acts exactly as a mechanical pump except when vacuum is applied to the water pump. More on that,I suggest this video :

 

Which the 991.1 does not have. And from what I have read on Rennlist and who knows how accurate that is, they can leak from the vacuum line and then other parts upsteam need to be replaced.

In any case, no matter which series of 991, failure at such low mileages is a joke.

 

It sucks coolant up the vacuum line : it shouldn't happen but it's still a simple system...most likely it either has a vacuum canister to retain vacuum on startup or a valve block that distributes vacuum or both. Since we know it applies vacuum,what would vacuum do to a mechanical pump? It slows it down in my mind...so on cold start it would move less coolant and it will warm up faster. It's for emissions : not the best design but the theory of operation is simple. Why it fails? Because the membrane(or whatever they are using) inside to slow up the impeller bursts and allows coolant into the vacuum circuit. It's just a ridiculous solution to a simple problem. Lol!

 

after my 3rd pump in 50K and dealing with the dealer I had had enuff...switched brands and havent looked back,,,still hanging around till I sell my COBB..its in the parts section..

 

Just had the pump fail on my 2017 C2S manual w/l 23.5k miles. Got the engine over temp warning, pulled over, and had it towed to the dealership. They called this AM and will replace it under warranty.

 

folks there is a recall from Porsche ( service bulletin) for the water pump, i had mine replaced for free from the dealer. they replace the water pump and valve block as well.

 

I had planned on having the dealership look at mine next week when it was going in for a scheduled oil change. As luck would have it, the pump failed early. But I would not have known it was an issue without the good folks here at Rennlist and this thread. Could have been a reason for a crummy day, but thankfully I had a sense of what the issue was and how to get it resolved quickly. Thanks!

 

originally selected NO but that has now changed. car has 25k miles 41k km on it and has otherwise been perfect. coolant smell when hot but no visible leaks. pump has internal leak, needs new pump, new vacuum valve block and new vacuum lines. 2 week wait for parts from Germany. had the car in for intermediate service but at least the coolant repairs are warranty covered.

 

2012 // 991.1 Carrera Base // 7 speed manual / 103K miles >> no water pump issues...actually I have had no real issues since I bought the car with 54K on the clock. It's my daily driver - kept outside - as the 1980 911SC warrants the garage space....It does suffer from the warped interior door panels... My 991.1 is my "therapy" machine... always makes me happy to drive it

kgl

 

Last month my 2019 T, with 9k on clock and 2.5 months left on CPO, suffered "the" water pump failure. Needless to say it was disappointing. If they haven't yet, I hope they extend the 10 year warranty to 2019 too as it is a little discomforting thinking about the possibility of it happening again. Extending the warranty for another 5 years looks like $5K

 

What changes in the water pump design did they make from the earlier 991.2 models to the later 991.2 models for them not to offer the extended warranty to the newer ones? And at what model year of the 991.2 was the crossover from the 10 year to the no warranty scenario. Does not apply to my 991.1, just wondering.

 

I heared somewere they disconnect the vacuumhose from the pomp and block this with something(bolt ans tywrap?)to protect the vacuumsystem from coolant getting in ?
Anyone know this?