I replaced the center pod a few months ago and just recently replaced the defrost pod, and I still think something might be wrong. When the system reaches the desired temp (72), the fan will mellow out and then most of the time the defrost will open up partially, allowing a/c to come out the defrost along with the center vents. If I drop the temp on the wheel, the system will crank up and the defrost shuts completely until it reaches temp again and then will reopen the 20% partial defrost. Is this normal?