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I make this point about where and how to vent the block whenever the subject comes up. Not an original idea on my part, that's the way Mazda does it. They just happen to use that path to do other functions as well (manifold heating, throttle body heating, etc). This port is high and at higher pressure than the waterpump housing outlet so it is ideal for air venting.
It may help if you understand that the waterpump housing outlet is NOT the outlet of the water pump. Study the engine and pump a bit if this doesn't make sense to you.
Tracy
On Tue, Dec 9, 2008 at 5:06 PM, David Staten <david.staten@gmail.com> wrote:
Tracy Crook wrote:
Jeff, there are two ports on the rear iron. ...and a smaller one on the top which should go to your coolant expansion tank through a small diameter hose. *This is the primary point where the block purges air*. If you have this one blocked off, your coolant system is not configured as well as it could be.
Tracy
I've been following this stuff for years and THIS is the first time that I can recall that point being made.. I always figured the expansion tank took off from the filler neck or the radiator..
Dave
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