Not getting any heat, just cold air. The coolant system was recently drained, t-stat and hoses changed, and refilled. At that time the system was blowing hot when run on hi during the refill process. But now no heat and I am wondering if there is an air lock in the heating part of the system.

Is there a procedure for getting that air out. Are there better things to check for first?

Thanks, it's Florida, but still cold!