Thanks for the air lock info, but let me expand. I filled the expansion tank and started the car - but nothing drained from the tank into the radiator like I thought it would. I then mad a bone head move (perhaps) and took the top radiator hose off and put some coolant in (about 1 pint). My thought was to prime the water pump. Sealed it all back up and got the same results.

Where do I go from here to undo the problem? I really do not want to take that ******* elbow hose off and mess with trying to get the mystery nut off to change the thermostat.

Thanks

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94 E500 (Silver/Black)