the Professional Grade, AKA GMC Envoy has been in the shop for a few days. New water pump, fan belt and fan clutch and we are good to go… Auto Clinic ROCKS!!! My Credit Union puts a $1000 on your daily purchases. Good to know for safety sake, but if you are on vacation, that could be trouble. Well all is well. I know the sound is only mono..i’m working on that at the moment also.