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YOUR RESEARCHworking system pressure Coolant tank
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Run fully warmed up
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Suggestion · Original poster
Can someone tell me what the system pressure is for a 996 when it is running fully warmed up?
Leading evidence: 'Run fully warmed up' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run fully warmed up' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Hello,
I have a leak at the coolant tank pressure relief valve when I pressurize the system to 10 psi. Can someone tell me what the system pressure is for a 996 when it is running fully warmed up?
If you also test the tank cap, you will see what the working pressure is. If the cap is good, it will usually pop-off at 19psi and re-seal at 14psi and hold 14psi. So working pressure is 14-19 psi.
Good question. I would expect my own coolant system pressure to be well under 5psi, because my temps rarely go above 100C, but that�s just a guess. Oh, and with coolant mix, boiling shouldn�t even be happening at higher than 100C now that I think about it.
Maybe my response wasn't complete enough.
Everything in the cooling system must be capable of holding at least 19psi, as 19psi is the pop off pressure of the tank cap.
So a leakage at 10psi indicates a faulty component.
The actual running pressure in the system at a given moment will depend on all the variable conditions/temps
Here is how the test is being done.
I removed the coolant tank from the car, plugged up ALL the hose connections at the tank. Removed the blue coolant cap. Applied a coolant tank tester unit at the coolant tank neck and pressurize it by hand to 11 psi.
At that point, I observed the small air bubbles coming out of the bleed valve bolt(s). Which means if the working pressure is 15-19 psi, then the bleed valve / orings / gasket are done. The good news is there is no leak anywhere else from the coolant tank, the short expensive version. So only a $40 bleed valve needs to be replaced.
It also points to one source for the white smoke when the car has been driven for 15 minutes. The working theory is: "When it's hot and pressure is high, coolant is leaking out of the bleeder valve bolts, flows into the overflow tube, drains down on to the exhaust of bank 1-3, and smoke like a chimney from under the car.
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