Re: Huffer Won't Huff.....
I had the same problem I was told that the IC pump was going bad and to get a Johnson pump to cure my problem. So I spent $170 got the pump, installed it and...you guessed it, same problem.
Woody told me to move the heat exchanger higher up into the air flow. I did that and have been problem free ever since. That includes while running stacked pulleys.
Might be worth a try. Worked for me and it's free!