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The difference between the temp of the top and bottom hoses is how effective your radiator is at removing the heat from the system. In colder weather the difference will be greater and in hot weather it will be less as coolont will flow much faster when temps get hot outside.
It may take a few cycles for the air to completely purge out of the radiator, but it should be completely full when cold after those few cycles. Make sure you do not have any leaks in the hose from the radiator neck to the recovery bottle. I use a magic marker on the recovery bottle to mark the coolant level and watch it for a few days to make sure it is the same. Remember increasing ambient temperatures will cause the level to rise slightly but not much. What you don't want to see is the level dropping without any apparent leaks. That is an indicator of head gasket issues.
Run the heater, even with the windows open to fully purge the system.
regards
Mech
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