Purekoryo

For those that had coolant leak into the control block, did you also notice a tiny draping leak underneath the car? Again, I see only one tiny wet spot right underneath the pump and can see calcified hints of coolant on the metal bar that goes across the rear bottom of the car, right below the water pump pulley.

Josh(PA)

Thats a sign that your water pump is bad/ leaking. Read through the "Did you (h)wave the water pump replaced" thread. Lots of pics of failing water pumps in there. When the water pump starts leaking, supposedly it does allow coolant into the vacuum lines. Seems like your exhaust work was just an unfortunate timing coincidence. When mine failed, I never had coolant puddles on the garage floor. I did smell the occasional sweet smell of coolant burning off my exhaust and did have dried coolant stains on and in the area of the pump.

Peter80

See my earlier post. My 2016 991.2S had water pump replaced in Feb under warranty. Overheated again in Sept, they said must have been air in the vacuum lines. This week it shot up again. Replacing the water pump a second time now but still not 100% sure why the sporadic occasional overheating.

Purekoryo

This is getting pretty ridiculous. Outside of the Lemon law, has anyone been able to convince PCNA to buy back under warranty under these types of circumstances?

Peter80

Main issue I think is that all 991.2's from 2016 to 2018, before they modified the dodgy water pump, should have been subject to recall. I wonder how many people have had the water pump go just after the warranty expired.

drcollie

On the first post of this thread I immediately suspected the water pump, it was just coincidence it coincided with the exhaust work. Water pumps have bearing failures and can be intermittent when they begin to go. It usually shows as a small drop(s) of coolant and the beginning of an overheat issue. Then they get worse over time as bearings do until they fully fail. Shutting off the vehicle lets the bearing cool off and when it engines is run again, the bearing may run true the next time. This is the case with most all water pumps - not Porsche specific. Just replace it now, makes sure the coolant lines are purged of air (long run to the front radiators) and you should probably be good to go.

Josh(PA)

The quick overheat issue isn't due to the water pump directly, it is due to coolant leaking into the vacuum lines and not letting the coolant shut off valve, and water pump switching valve perform their functions.

Peter80

Only issue is that mine's never leaked or been gradual. Just all of a sudden as if total cut off to coolant circulating, it rockets up in a few seconds. Then after cooling down it's fine again, until the next time. I'm no mechanic but it's got be some sort of valve sticking.

Purekoryo

so it's an internal leak as well? I definitely have an external one as evident by the pink spots I see at the bottom. Going to make sure that my SA also replaces any affected COV from this leak. Now to find the tech bulletin so that I can take that with me and the new procedure that when the water pump gets replaced, the COV's have to be replaced as well.

Josh(PA)

That's the way the dealership explained it to me. When the water pump leaks, coolant finds its way into the vacuum lines. According to the dealership, Porsche just recently updated the work order for .2 water pump replacements to also replace the vacuum lines and valve block. You should check with your dealer to be sure they aer following that practice.

barncobob posted in the water pump thread that this is what he had replaced. I'll get mine back tomorrow and update as well.


according to the invoice....heres what they replaced....valve block,coolant pump, vacuum pump,control line and bolts, gaskets,etc...vacuum line to coolant pump


invoice says paraphrased..coolant has escaped,entered vacuum line for thermostat,,also removed/replaced brake booster vacuum pump due to coolant intrusion...

service guy said it was $3500 all under warranty in last week of warranty:}

has been perfect since, runs at 194

duxsi

Perhaps Porsche is leaning towards the highly vaunted Ford Pinto rationale.
Unless there is a proven risk to life and limb or the car catches fire, they will NOT replace these known failing water pumps, or launch a voluntary recall.
Rationale being if your engine overheats and cracks after the warranty expires, you saw the warning to pull over..

You can also forget the Lemon Law, as it only applies if they can't repair your car after xx number of attempts, and it's been in for repairs for xx number of days.

I'm not sure how the popular belief can be that Porsche stands behind its products, especially when the issue is based on the premature component failure.
And the so-called cases of goodwill are too few and far between.

kuma1416

So for those of us who had just the water pump replaced (version C), are we OK if the temp seems normal?

737gdog

Any specifics as to what modification was done to water pumps starting on ‘19 models? Anyone with a ‘19 had a pump fail?

Purekoryo

Theres an entire thread with polling on the 1st or 2nd page. Check it out. It does show some 2019’s were/are affected.

It may be more time/mileage dependent then any updates to the components. Need to perform a more advanced statistic (conditional probability, bayesian, etc.) to get a better idea though.

737gdog

I see it now. Thanks.