If you have removed the blower motor, Connect it to a 12 volt power supply(your battery)with some jumper wires.It should turn fast, be careful when you connect it, have a good grip on it, it will jump just a little. If it dont run fast its junk. The other 2 things
1)The fan switch
2) The resistor that slows the fan at low speeds.
HEATER BLOWER MOTOR
Its
faulty blower motor resistor. The low and medium speed on blower motor is
controlled by resistor and its actual speed is high. So because resistor is not
working, blower motors actual speed which is high is working.
It
can be faulty blower motor or faulty blower motor resistor. Get the blower
motor inspected. If it's faulty it has to be replaced.
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For
blower motor testing and replacing, check the link below: ----
http://repairhelpcenter.blogspot.in/2012/02/blower-motor-replacing-for-all-vehicles.html
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These will help.
Thanks.
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