2001 Boxster Coolant Leak

[blue62]

Originally Posted by The Sandman

Update: replaced bleeder valve, system still holds no pressure (using pressure tester) and I can still hear air seemingly near bleeder valve during pressure test. O rings are on it properly. System also dumped a ton of coolant through overflow again today after a spirited run.

No evidence of coolant in trunk. Is there anything potentially serviceable underneath bleeder valve? Stumped on this one.
Dave

Simplest things first.
are you sure the bleeder valve is in the down position?
If yes take it apart again and make sure you reassembled it correctly.

[The Sandman]

Originally Posted by blue62

Simplest things first.
are you sure the bleeder valve is in the down position?
If yes take it apart again and make sure you reassembled it correctly.

Took apart again. Everything seemed in order... cleaned around new o rings. When cold still had difficulty holding pressure. If I pumped up to 4psi I could hear a high pitched squeal coming from around bleed valve housing.

Nevertheless I started the car and once it began to warm up, I was able to pump pressure tester to 5-7lbs and it would hold pressure. As engine warmed up pressure increased as well.

Wondering if I’ve finally seated the bleed valve correctly.

Popping up tab on bleed valve reveals a burbling sound which goes away with tab down. System still holds pressure and does not leak out overflow valve.

Despite having an .04 cap I think that is now the culprit.

Off to dealer to grab new cap. Fingers crossed!

Many thanks for all of the great suggestions.
Dave

[blue62]

Originally Posted by The Sandman

Took apart again. Everything seemed in order... cleaned around new o rings. When cold still had difficulty holding pressure. If I pumped up to 4psi I could hear a high pitched squeal coming from around bleed valve housing.

Nevertheless I started the car and once it began to warm up, I was able to pump pressure tester to 5-7lbs and it would hold pressure. As engine warmed up pressure increased as well.

Wondering if I’ve finally seated the bleed valve correctly.

Popping up tab on bleed valve reveals a burbling sound which goes away with tab down. System still holds pressure and does not leak out overflow valve.

Despite having an .04 cap I think that is now the culprit.

Off to dealer to grab new cap. Fingers crossed!

Many thanks for all of the great suggestions.
Dave

With things working correctly you should be able to pump the pressure up to around 14 PSI and it should hold the pressure.
If you do a search on the forum someone has probably listed the spec for pressure but 14 PSI is in the ballpark

[The Sandman]

I purchased a new cap (another .04 cap) and appears to hold pressure now and release steam when loosening cap (something that never happened previously) when engine is hot. There was no additional output via the overflow tube after spirited driving or letting it idle.

I will pressure test again to see if I am able to get it up to 14PSI or so, but cap seems to have been the ultimate culprit.

Sincerely appreciate all the comments and support on this forum.
Best
Dave

[blue62]

Originally Posted by The Sandman

I purchased a new cap (another .04 cap) and appears to hold pressure now and release steam when loosening cap (something that never happened previously) when engine is hot. There was no additional output via the overflow tube after spirited driving or letting it idle.

I will pressure test again to see if I am able to get it up to 14PSI or so, but cap seems to have been the ultimate culprit.

Sincerely appreciate all the comments and support on this forum.
Best
Dave

Hey glad you came good.