986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Ugh.... I Need Some Help Identifying a Coolant Leak

Steve Tinker · 05-02-2015, 01:44 PM

When was the coolant tank last replaced?
On inspection, my old tank was bone dry and there was no evidence of leakage - until I unbolted it and felt (you couldn't see) encrusted coolant on the rear portion of the tank. When I physically removed the tank, there was 2 cracks which only leaked when it heated up - when cold it held the fluid and did not leak. It was enough to lose half a litre every 1000 km.
The other leakage(es) could be around the pump / thermostat / radiators (bumper removed), but that would mean getting the car on jackstands and exploring for visual evidence with a strong light source....
Your pressure test would (should) simplify the search.

05-02-2015, 01:44 PM	#11
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	When was the coolant tank last replaced? On inspection, my old tank was bone dry and there was no evidence of leakage - until I unbolted it and felt (you couldn't see) encrusted coolant on the rear portion of the tank. When I physically removed the tank, there was 2 cracks which only leaked when it heated up - when cold it held the fluid and did not leak. It was enough to lose half a litre every 1000 km. The other leakage(es) could be around the pump / thermostat / radiators (bumper removed), but that would mean getting the car on jackstands and exploring for visual evidence with a strong light source.... Your pressure test would (should) simplify the search. __________________ 2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley. 2001 MV Agusta F4.