I'm not too familiar with FD's although there is one that I'm looking to purchase on this forum which the current owner claims it has a problem with the A/C due to the tuning of the Power FC. The problem is that it will only work on settings 1 and 2 but 3 and 4 it shuts off. Has anybody else ran into the problem before and if so how would I go about fixing it? Thanks ahead of time and sorry if this is a re-post but I couldn't find a thread about it.

 

A/C related problems are common with the Power FC, you will find a lot if you search.