Hey guys, I'm helping a friend out and fixing his '91 420sel. The blower motor is weak and the low,
auto,hi buttons don't do anything. I'm getting 12v constanly from the red reg wire to blower, doesn't change with any combination of buttons pressed. Obviously I searched and found the reg is the most common issue, but i also read about the ccu having bad solder joints.
The blower will run on high if I jump it, so I know its good.
Any insight?