At times with closed throttle and AC on, the idle goes up to maybe 1000 for one or two seconds as compressor cycles. This can be a concern when comming up to a stop. I also notice the economy gauge (vacuum gauge) shows max vac on Heat and Econ but 1/8 on Defrost and AC. Disconnected Y7 and no change. I also get a low flow of cool air from center vent in Defrost and Heat. Are these connected? Thanks.