Main Fan Speed Control In Cockpit area.
2015 SunSeeker Chevy 4500 fan speed control Knob acting up. Some times work fine, minutes later is out can get it back to work. Inspected all cables, fuse boxes inside/out. Removed Eng cover inside check knobs connections but nothing. It act like some type of shortage or ground issue. All other knobs for air/heating setting are working properly. Any recommendations what else to check or look for.