No check engine light or anything else. The AC does work as it blows cold air, its just that the control unit will not change the fan speed or the vent location.
One thing is that when I had the surging problem the vents only blew out hot air.
So far Im thinking OVP or the CC unit itself.
2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special