Go to online store reliable they have repair manuals I am sure you will get the solution. Here's the link
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SOURCE: where is blower motor resistor
There is a resistor pack for the fan speed in the ductwork near the fan.. It is very easy to replace once it is located. Ussually there are either one or two 5.5mm screws holding it in place. Once you get it out you will notice the resistors that are burnt.
SOURCE: 99 Olds Intrigue, blower fan resistor
It will burn out. Air flow in the heater box cools the resistor. These resistors get very hot when the blower is running.
SOURCE: BLOWER RESISTOR BAD FAN ONLY RUNS @ HIGH SPEED
Chevrolet 2004 TrailBlazer
Look next to the blower. You can remove the panel under the passenger side. Go through the glove box and move it down out of the way to access the electrical connector. Then remove two bolts and the electrical connector.
SOURCE: Blower motor vent selection switch not working
the hvac selector switch in the dash may be the problem.You need to remove the switch and look at the connector on the back of switch,see if there are any burnt wires at the connector or switch.It's all electronic and the switches have been known to burn out on this and other model.
SOURCE: 2003 Chevy AC Fan Blower Motor troubleshooting
first check the fuse or relay.. this will be the cheapest sollution and easiest to check.
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