Have an air problem. I have air from the floor and defrost, but nothing from the front 4 vents in my '03 Envoy XL. It switches from defrost to floor fine, but when I go to dash nothing. Like the diverter isn't moving. Anyone ever experience this? Not sure where the vacuum lines are that I need to check in case that's the problem.

Help ya'll...

It is a small servo actuator that puts air to your front vents. Good news is the part is not very high but the labor to put it in is outragous. Plan on the dealer or whoever keeping the vehical overnight.