986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - 1st Boxster 7th Porsche, we now have 4 in the family

Steve Tinker · 11-23-2015, 11:34 PM

jc - when you ran the car with the new coolant and pump, did you have the chrome D shaped ring (expansion valve mounted on top of the plastic coolant tank) lifted in the up position?? You mention Allie saw the temp gauge going up and down before it pegged - to me that indicates air in the system. Every time I have replaced my coolant or pump, I leave the valve open for a few days (or several complete heat cycles) just to rid the system of air. And every time it cooled (overnight) sure enough I had to add coolant to bring it back up to the max mark.
Why the car failed to fire after stopping maybe another problem but I'll bet its got something to do with the excess heat....

11-23-2015, 11:34 PM	#61
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	jc - when you ran the car with the new coolant and pump, did you have the chrome D shaped ring (expansion valve mounted on top of the plastic coolant tank) lifted in the up position?? You mention Allie saw the temp gauge going up and down before it pegged - to me that indicates air in the system. Every time I have replaced my coolant or pump, I leave the valve open for a few days (or several complete heat cycles) just to rid the system of air. And every time it cooled (overnight) sure enough I had to add coolant to bring it back up to the max mark. Why the car failed to fire after stopping maybe another problem but I'll bet its got something to do with the excess heat.... __________________ 2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley. 2001 MV Agusta F4. Last edited by Steve Tinker; 11-23-2015 at 11:37 PM.