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thstone · 12-09-2016, 04:43 PM

A little more explanation...

The coolant continually circulates thru the heater core - whether the heater is on or off. Thus, as BoxsterSteve suggests, its likely that there is an air pocket in the heater core creating the gurgling sound.

I'd start with bleeding the coolant system (lots of posts on this topic).

12-09-2016, 04:43 PM	#3
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	A little more explanation... The coolant continually circulates thru the heater core - whether the heater is on or off. Thus, as BoxsterSteve suggests, its likely that there is an air pocket in the heater core creating the gurgling sound. I'd start with bleeding the coolant system (lots of posts on this topic). __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor