Originally Posted by Hollywood_Cal
Is there a test like to know if there's air in the system ...
Burp the cooling system. You can use a radiator attachment, like this...
.. which can be found online
, or possibly at a local auto parts store.
Or you can just leave the radiator cap off (or just set on top of the filler neck to prevent any potential splashing) and leave the engine running until the radiator fan cycles at least twice and/or until you no longer see any bubbles in the coolant. Keep the coolant topped-off (base of filler neck)
If you use one of those attachments, keep the reservoir about 1/3 - 1/2 full. I recommend getting one, they work great and can be used on a variety of automobiles since they come with different attachment pieces.