986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Can a leaky coolant cap cause increased water temps?

pothole · 07-07-2012, 08:12 AM

Just replaced my coolant cap which was leaking very slightly. Was the original cap from '97 with the .00 part number. New part is .04.

Thought I noticed higher operating temps recently, which is what hand me sniffing around the cap. Nothing absolutely dramatic - normal temps on the cruise, but was quicker to build heat and spin the fans up in stop start traffic.

Haven't had a chance to fully test the new cap, but was wondering whether a leaky cap and presumably some pressure loss would push up operating temps a bit?

07-07-2012, 08:12 AM	#1
pothole Registered User Join Date: May 2010 Location: UK Posts: 874	Can a leaky coolant cap cause increased water temps? Just replaced my coolant cap which was leaking very slightly. Was the original cap from '97 with the .00 part number. New part is .04. Thought I noticed higher operating temps recently, which is what hand me sniffing around the cap. Nothing absolutely dramatic - normal temps on the cruise, but was quicker to build heat and spin the fans up in stop start traffic. Haven't had a chance to fully test the new cap, but was wondering whether a leaky cap and presumably some pressure loss would push up operating temps a bit? __________________ Manual '00 3.2 S Arctic Silver