Posted 5/14/2019 21:21 (#7497659 - in reply to #7497619) Subject: RE: 3594 cab is not getting high blowing air
SE SD
Try a new filter first. Next would be to see how much air you're losing out the headliner, specifically the HVAC & Radio console. Air like to escape there instead of the vents. Elmer's Repair makes a special high capacity blower motor that is more powerful than the factory stock blower motor. This may help as well.