Heater fan motor wont run on high

The complete removal is shown in this youtube video.
http://www.youtube.com/watch?v=vLdMYx6fhic

So you're getting heat but no blower to circulate the heat, right? It's also possible the fuze is blown to the blower motor, the switch that adjusts the speed of the motor could be damaged, or its resistors that limit voltage, to control speed could be "open" (burned up). I would check many of those before replacing the fan..

The heat is controlled by a valve that allows water to circulate through the heater core. If the fan is blowing cold air, check the valve, or blow water back and forth through the heater core to clean it out.

I would replace the blower motor resistor first then see if that corrects this. The resistor is located next to the blower motor under the dash.

check blower moter relay or fuse ..if ok probly the control switch fan blower control switch....

u need to replace the control panel and the blower moter resistor....hope it helps and be glad to help more if i can......

A bad blower moter resistor can cause the blower to default to high speed only. The resistor is
located behind the lower right side of the dash on the heater box just left of the blower moter.
The fan switch can also cause this problem, but more often then not it's a bad resistor.
Hope this helps.

Check the heater control switch,,,,,and the number of wires at the heater motor....Some motors have more than one winding...in which case there will be three or more wires going into motor..there can be burnout in those windings and will require a new motor....check the plug which attaches to the motor....can be bad connection...or at the switch.....but if there is only two wires....then the heater switch uses resistors to slow down the different speeds...and direct connection for high speed....and the problem is definitely the switch...

The control is not the problem. Your blower motor resistor is burnt out on two fan speeds.
This is a high failure rate item that the factory has redesigned at least twice for this concern.

replace the fan resistor located on the side of the heater box under the dash usually on the passenger side this controls the fan motor speed along with the switch itself.

is this wiper-heater fan - if motor is working assuming this is heater/ac fan motor --have switch tested

Could be two things. Heater control..or heater switch. Or the moter is not recieving the reostat info from control. Check at heater wher wires go into it..as you change positions of switch you should see a voltage drop or increase, if u do then the moter is bad...if u do not then replace the heater control unit. :)