Ah. You have a NEWER engine... Mine is of the older vintage, where the
expansion tank is part of the pressurized cooling system.

However, the secondary expansion tank, located at/near the high point of
your system, with a cap of lower pressure rating would still serve you
well - it will need an overflow tank like your current and conventional
expansion tank. Installation of this tank essentially moves the
functionality of the expansion tank/overflow tank to the high point of
the system where the air can be collected and expelled, while retaining
the existing system as a backup.

It differs from the air bleed valve only in that it uses radiator caps
instead of the bleed valve.


My request for how the air bleed valve works out was motivated by the
concern that it might not work well at the low system pressures of an
engine cooling system (say 7-20 psi).

bob

Glenn Ashmore wrote:
"RW Salnick" wrote in message
...

Glenn, when the system cools, air will re-enter the system thru the
radiator cap - it is designed to do that


The way I read the shop manual it won't if the overflow tank is set up
right. It will suck the coolant back in that was pushed out as the engine
heated up.