I have the same problem on my 2004 GMC Canyon. No it's not a resister issue because I already went to the GM dealer to get the replacement resister, Installed it and it still only works on 4. Try bending the prongs on the connection towards the thumb clip ever so slightly to get a better contact, I find this solves the problem 95% of the time. Also the GM dealer will not give refund on electric parts wheather you installed it or not so save your self the $20.01 and a trip to the dealer.
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Hi, check fuse 12 first. If it is good, you will need to replace the blower resistor. The high speed relay is built into the resistor. The resistor is next to the blower motor and looks like the picture below. There is a connector in the resistor and the 2-wire connector coming out of the resistor attaches to the blower. The blower is usually under the dash above the passenger's feet. You may have to remove a kick panel to see the motor and resistor. Please let us know if you have any questions, and thanks for using FixYa.
The blower motor fan is controlled by the blower motor resistor.Its the resistor which controls the fan on respective speed which you select.But if the resistor goes faulty,then it will not be able to set the required speed which you set for fan,so it works on high speed only.
In this case you will have to replace the blower motor resistor.
Check fog for the location of blower motor resistor location:--- see part number 8 in the diagram below.
The blower motor resistor is located next to blower motor under the dash.Its fitted with 2 screws and a wiring connector.You have to remove the screws and wiring connector and take the resistor out and place the new resistor in same position and connect the connector as well as screws.
this should help.Thanks.Helpmech.
It could be the Blower Motor Fuse or Relay and they should be located in the cabin Fuse Box, if both are OK, it could be the blower motor resistor, located on the blower motor housing, it is the part where the electrical connector goes into and it's got a pigtail connector that goes to the blower motor, it is attached to the blower housing by three screws. Here are some pictures for better identification. FRONT VIEW
CONNECTOR FROM RESISTOR TO BLOWER MOTOR
SIDE VIEW To test it, make sure the electrical connector has voltage when the FAN is on, if voltage is present, it means relay and fuse are OK, plug the connector into the resistor and check voltage on the pigtail connector, if voltage is present, the resistor is OK, voltage varies according to the speed selected. To check the blower motor, apply 12 volts and ground the the motor terminals, it should kick in in Hi speed, if not Replace Blower Motor. A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.
on this model you need to inspect the blower resistor and connector,
a poor connection at the resistor and connector causes heat and burns the wiring.
if its burnt replace the resistor and find a good connector at the salvage yard.
it is near the blower motor
No heat or no air volume? No heat may mean no coolant! check it now! Your 4.2 wont stand for being overheated. No volume, check the fuse, if ok then turn on you fan and check for voltage at the electrical connector at the blower motor (under the glovebox). If you dont have a test light, tap the blower motor . If that kicks it to life you need a blower motor.