Hi Gary just want to let you know i got a small belt @ had it running for the last time this year had the cap off it wasn't that low in coolant but your right about the air in the system but it was runnig for a few minutes it seem to be normal when it came to idling when it was warm the idle quicked down but one thing i noticed when it reach temperature when the fan is suppose to quicks on it did not come on oh well next spring.....Oh ya i also did not see the heavy thick white smoke from the exhaust so i assume everything is ok..............i hope.