Front upper air vents have weak air flow when I've got the blower maxed. It's not a blend door issue because there's no air coming out of the defrost or feet vents when I've got it on head only, and vice versa when it's switched to defrost or feet only. Almost seems like something is clogged? Whether it's on heat or AC (which is broken), it's the same, although I did clean out the AC evaporator like everyone says to do. Any suggestions? It looks like I'll have to take apart the dash to fix any problems?
'97 suburban, ~200k miles
'97 suburban, ~200k miles