My blower motor will only work on the lower blower speeds, it will not work on high. I replaced the blower motor and replaced the blower motor control panel on the dash. What else could be the problem. I plow snow and really need the extra blower speed to keep the window thawed off in the winter. Thanks for any and all ideas.
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there is a resister near the blower motor that controls the fan speeds that is most likely your problem when it goes bad the blower motor will only work on high i have changed many of them on many cars & trucks
In the beginning you should check for voltage and ground. The 50amp fuse marked AC powers the blower motor and the motor is grounded. The high speed relay bypasses the resistor. So you should have power coming from the fuse and thru the high relay. Then the resistor for the other speeds gets power from the heat and ac control module which also controls the blend doors. You may need a shop manual or repair book to get the diagrams.
The blower motor resistor is located within a foot of the blower motor in the duct that the blower motor blows into. The resistor is actually cooled off by the blower motor blowing across it. It has a wire harness that connects it to motor & fan switch. It is held in place by 2-4 retaining screws. Disconnect wire harness,unscrew retaining screws then lift out. Reverse order to install.
I would get the fan motor itself checked out. #5 position is where the current goes straight to the motor, that being burnt out indicates a burnt motor to me, or the resistor is fried. But I think the resistor is either in the motor or the controller, so either way, do check the fan.
The blower motor is on the passengers side under the dash.You might have to remove the a lower panel.This is the insulator panel.If the blower works at all just turn it on and follow the noise.Hope this helps.Good luck.