Head Gasket
Hi, I have a BMW E60 2006, I changed the Electric Water pump, and
Thermostat and the car never reached the level of overheating. The
expansion tank is always at the right level, it never loses coolant, it's been
more than 4 or 5 months. I bleeded the system 2 times after the electric
water pump replacement. I noticed that sometimes in the morning when I
open the expansion tank cap, i hear a small hiss, is this a sign that my head
gasket is starting to wear out? or is it normal, it happened in the week after I
replaced the water pump. If the car is not losing coolant, can i say that my
head gasket is good?
Thanks,
Martin