When my ac cuts off there is a loud pop from the

This sound comes from the compressor or the fan housing, and it is sound as it is going out soon...you need to keep the unit from getting too hot buy overworking the unit or getting freeze or building ice on the condensing unit, also try to check on the fan and see if it is not secure or it is not moving freely and not from side to side…try to keep it clean to extend the life of it for now…let me know how that work for you and please do not forget to rate my service so we can improve on it with your help. God bless

If the pop noise after turning off cooling or heating. In heating, this is the noise of the refrigeration system changing/adjusting itself and this is perfectly normal.

Mat