Changing the coolant breather valve

[schoir]

Originally Posted by Dale_K

Anybody have a picture of the tank opening once the bleeder valve is removed? I replaced my bleeder last week and didn't see any o-rings at all. There was a circular disc with a couple rows of holes sort of near the center but I didn't lift that off. Are the o-rings under that? I doubt my bleeder valve was actually bad. The new and old looked and operated identically.

Dale:

Top of coolant tank with bleeder valve assembly removed:



Regards, Maurice.

[insite]

slim -

in maurice's photo above, from where is your new leak bubbling?

[shlim8]

Hi insure, the bubbling is from an area below the valve housing, close to one of the bolt holes. After careful inspection, there are 3 small and light "scratches" there. Turns out they are prob hairline cracks. Very hard to see and bubbles only when the water temp goes beyond 80 degrees C. The tank is toast, got that changed yesterday. Guess it's better to discover the prob now when I'm monitoring the breather valve than the tank letting go in the middle of the highway.

Btw my Porsche original O rings are really round not square.

[insite]

sorry to hear your tank is dead. thx for the info that your kit came w/ an o-ring & not a square ring. looks like the factory thinks either solution is ok here. take care.

[shlim8]

Dale, just in case u need it - the size of the O rings are listed as 17 x 4 and 47 x 4 (I presume in mm).

I'm now enjoying a stable 80-85 degree celcius coolant temp.... (with the LN lower temp thermostat). It used to spike up to 90+ even with the lower temp thermostat... guess I was losing coolant pressure.

[Dale_K]

Originally Posted by shlim8

Dale, just in case u need it - the size of the O rings are listed as 17 x 4 and 47 x 4 (I presume in mm).

I'm now enjoying a stable 80-85 degree celcius coolant temp.... (with the LN lower temp thermostat). It used to spike up to 90+ even with the lower temp thermostat... guess I was losing coolant pressure.

That's good to hear. My car is in the shop for a vacuum leak fix and a Tiptronic service, so I haven't checked it. Part of the trouble with buying an old car is you don't know what things are supposed to look like or whether somebody left out parts in the past. I'm not even sure my car has the o-rings at all. I sure didn't see them when I removed the bleeder valve cap but I didn't take out the circular disc with the holes in the center.

[Andrew McD]

Sorry Dale, but on a different note, what is a tiptronic service?

Mine is a 1999 and the tiptronic is getting a bit lumpy.