I haven't looked at the diagrams, but I'm guessing the high is straight 12v to the blower motor. Although I don't currently have air working in my truck, I remember these even being new didn't pump out that much. Kind of wonder if GM didn't keep the blower speed down, to reduce cabin noise.
I used the heat this last winter, and it seemed to be doing alright, but the system also came completely apart, new evap, etc. I'm not sure if it moves as much air as my '01 F150 though, and it is loud.
Aside from possible difference in fan size, pitch, and blade width, probably the only thing to get these to move more air would be a motor that's a higher KV.
Technically if I person could open one up, and remove a few turns of winding, it should increase the motor RPM. Or find a different motor which has a higher KV. There isn't a lot of data to compare components though. Person could check with a meter.
I don't suspect any of this info will really be of any help, also not an electrical engineer. Just thought I'd throw it out there.
I used the heat this last winter, and it seemed to be doing alright, but the system also came completely apart, new evap, etc. I'm not sure if it moves as much air as my '01 F150 though, and it is loud.
Aside from possible difference in fan size, pitch, and blade width, probably the only thing to get these to move more air would be a motor that's a higher KV.
Technically if I person could open one up, and remove a few turns of winding, it should increase the motor RPM. Or find a different motor which has a higher KV. There isn't a lot of data to compare components though. Person could check with a meter.
I don't suspect any of this info will really be of any help, also not an electrical engineer. Just thought I'd throw it out there.