"glenn" wrote in message
.. .

Is there any reliable way to test the air bleed unit ?

It usually has a shrader valve on the top. While the system is off
press
this down. If air comes out then it is malfunctioning. It should
automatically vent air out of then system.

Thanks, will check this out.

The better auto air vents can be changed without a drain down. If you
change the vent get one of these.


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