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Steve Tinker · 05-25-2015, 02:14 PM

Is the pressure relief valve leaking (located under the plastic cover below the coolant / oil fill caps)?
If you remove the plastic cover and see residue, its a good sign that the O rings are leaking when hot. You can try lifting the chromed D ring to its vertical position for a few days heat /cool cycles to make sure its not leaking condensation from the valve area.

05-25-2015, 02:14 PM	#5
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	Is the pressure relief valve leaking (located under the plastic cover below the coolant / oil fill caps)? If you remove the plastic cover and see residue, its a good sign that the O rings are leaking when hot. You can try lifting the chromed D ring to its vertical position for a few days heat /cool cycles to make sure its not leaking condensation from the valve area. __________________ 2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley. 2001 MV Agusta F4.