Hey all. Sorry in advance if this is the wrong area. If I am then get the ripping out now and direct me to the right place. I’m new and have only replied to a couple things. I have 90 gmc suburban, 5.7 TBI. I have front and rear AC. It blows cool but very weak even on the highest setting. I’ve replaced the resistors, cleaned out debris from everywhere, swapped the blower motor and verified the blend door work. Any idea how to get more air pushing out the vents? Thanks