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I think that's the problem.
I got a pressure tester on the system - it held pressure, so it appears I don't have a leak. If it isn't leaking, I don't understand how it could have gotten full of air just from sitting for a few months.
How is it dangerous?
I think it's time to take it to the shop. I don't have a vacuum or a lift.
And the manual procedure starts with 'find a steep hill''
If you have an easier way -- I'd appreciate the help
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