it is also posinlr the motor isnt pulling the proper rpm or the coupler is going bad

what is the water pressure it also plays a role in your system

i remeber at the Hulahan seminar a few months back he was driving home air isnt always the problem

if it dont get hot bleed the air out. How many times do you blead a system before you look for the problem unquote

is the a leak in the system causing it to take in air
what kind of expansion tank is on the system