I just finished assembling my loop and I am currently leak testing and bleeding the air out. I am having an issue where every time I turn the pump off, air flows back up into the radiator. This happens when the cap is on or off. When the pump is off, the water level in the reservoir is completely full, when the pump is running it is about 3/4 full. I attempted filling it completely while the pump is running but the water wont go into the res, it just sits in the filling tube. The attached picture has the filling tube circled in red, you can also see that I attached a coupling so that I could take the line higher than the radiator but it didn't make a difference. The two black circles are where the air escapes when the pump is powered off.
What can I do to prevent the air from filling the radiator when I turn the pump off?
Thanks for your help.
What can I do to prevent the air from filling the radiator when I turn the pump off?
Thanks for your help.
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