1999 Chevy Silverado 2500December 15, 2013Cannot get the air to move between the different setting. Defrost to floor. Stuck in between and not much air coming out. Keywords:mode door actuatorno air conditioningNo Heatsilverado 1 thought on “1999 Chevy Silverado 2500” Freeautomechanic December 15, 2013 at 10:32 am If this is an automatic climate controlled system, your “MODE DOOR ACTUATOR” is bad or the gears are stripped. either way, your looking at digging into the dash to perform a visual inspection. Comments are closed.