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Turn both low and high adjustment screws carefully clockwise all the way in - do not overtighten.. Then back out each two full turns. Set the idle speed control for highest setting. Prime and start and let it run and warm up for about 15 seconds - then lower the rpms a tad and then adjust the low end screw for highest rpm. Then reset the idle to lower reasonable level. You may have to go back and forth with those two adjustments till it runs fine at low idle speed..
Then accelerate to highest speed and set the high adjustment for highest rpm. Then go from idle to high speed. If not smooth a small adjustment on the high speed screw is in order. Keep doing that until you get a nice smooth transition form low speed to high speed.
Do the blower speed settings still work, just weaker? Or is it just one low speed all the time? If you can still change the speeds then it's a weak blower motor. If its just one low speed all the time, (same speed for high and low blower speed settings) then you need a blower motor resistor.
Generally ther are at least three speeds and the wiring should be on the motor if they are varible speed. There should be a wiring diagram on a small plate or sticker on the side of the motor.Hope this helps you. Thanks
the various speeds are controlled through resisters (spring-like in apperance) one of different value for each speed, none for highest speed as the power gets to the blower uninpeeded . the resistor pack should be located on the center of the firewall, held by 2 screws. thats under the hood. where the engine bay ends....