jenkinsph, yes, I agree. That is why I had the dealer pick up the tractor already to look at the issue. I was puzzled when he told me it was working properly. Yes, the blue dial is turned on fully and the red dial is turned off fully. The compressor toggle is also turned on.
puckgrinder85, I don't have a way to check the charge amount. I certainly hope the dealer checked that when they had the tractor last week. The return line next to the engine is cold and is covered with condensation. I've always heard that is the rule of thumb to determine whether or not the freon level is correct. However, for some reason, the air blowing out of the vents is no colder than 70 degrees.