I have a 2009 Saturn Outlook with erratic dash vent operation. When car is first started defrost, dash and floor vents all work great ! After running 15-20 minutes all air flow stops even though blower motor is still running. I replaced the blend door actuator and passenger side temp door actuator, no change. I don't know what else to try beside digging into the hvac housing in the dash but that is not a quick-a-minute! Any suggestions would be helpful. Thank you, Tom