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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.
You need to get the blower motor resistor replaced.This is your problem.It is located by the blower motor.There will be a connector from the blower to the resistor.The resistor controls the fan speeds when you turn the knob on the control head.The blower motor is on the passengers side under the dash.Hope this helps.Good luck.
My Minn Kota 55 powerdrive had the same problem except mine occurred while it was trailered in the yard. High speed only, everything else worked great. From what I could research the control module is a frequent problem. Took a chance and purchased a new control module and this cured the problem. Maybe this happening and running aground was just concidental.
Recheck your wiring and check your ground. If all that checks out then triple check your control board. Also the motor SHOULD have a reset button make sure that the button is not out and it is fully pushed in
i had this same problem in my chevy prism-- my fan regulator had broken. (apparently it usually happens around 100k miles, i hear) in my car, the vents wouldn't even blow air at all on anything but high--- not just AC, but normal vented air as well.
cost about $80 to have the problem fixed by my mechanic in Jersey. hope that helps!
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