Air leak at the master

[2seater]

I suggested something like this MityVac as a handy tool for drawing fluid through the reluctant port. No guarantee it will work. It will tell you immediately if you can get fluid out the port without hitting the road. Even if this doesn't help, it is still a good tool to have for other uses as well. After all, Christmas is only a short time away and this example from Amazon is $33

 

 

[Padgett]

I use my Mityvac Pressure tester  also to find cooling system leaks