rxguy77

Hi all could use some advice. Bought a CPO 2015 panamaera with 42k miles. Recently low coolant warning came on then got engine overheating warning. Towed car to local porsche dealer. Dealer found no leaks, performed pressure test. Topped off coolant. Picked up car and next and low coolant warning again. car at dealer now for 14 plus days with no diagnosis. They are trying to find out where coolant going per service. Not sure what to do next.

ciaka

That is hard to pd if you don't know service history.
Could be simple *** air in coolant system or bad thermostat, etc. Could be a leak under manifold, from one of the pipes.
Assume Porsche dealer, surprised they have not determined after 14 days, what it is. Could also be wrong dealer having car.
Did you see coolant low yourself in the res tank?
Did you see leaking fluid under car?
Did you smell the sweet coolant smell when warnings appeared?
You gotta give as much tiny detail as possible, never know what can help ID situation.

Panamhtx

Hopefully this will apply to your case - I had what sounds like the exact same issue earlier this year, when it was cold. I was really worried and it stopped happening (normally would do it at starting the engine), then it happened on the middle of the Freeway and I was really concerned about blowing the engine .Dealership couldn't replicate . And then just stopped happening and hasn't happened since . I think perhaps temperature can cause a faulty reading every so often (and did intermittently for this period of time) . My car usually runs great so it's an aberration, hopefully same with yours, as well

LXV65 Porsche

check coolant vent lines under intake manifold it’s located under fuel rail


part number varies do to vehicle

LXV65 Porsche

I recently had to temporarily fix vent line with gorilla glue to get back home from outta town I sealed the vent line back got home them ordered correct vent line part#94610602622 note