if you lost one or two fan speeds you need to change the blower motor resister. it sells for around $60.00 at a dealer only.
It's right behind the glove box. However you must be sure that it is not he fuse or the blower motor resistor that has gone out on you first. You can test the blower motor with 12V power as that is what it gets on high speed. www.trailvoy.com Trailblazer enthusiasts forum.
To replace the blower switch on a 2002 Chevy Malibu, first disconnect the negative battery cable to ensure safety. Remove the dashboard trim panel surrounding the switch and then unbolt or unclip the switch from its housing. Disconnect the electrical connector from the old switch, then connect the new switch and secure it in place before reassembling the trim panel and reconnecting the battery. Test the new switch to ensure it operates correctly.
The switch is out or you have crossed wires-it's still getting current. Use a test light with switch off on hot wire between switch & motor. If there is current, your switch is bad.
check fuse
Either a broken wire - faulty switch - or bad ground. You're going to need a test light to find the fault here. Is there power to the hot side of the blower switch? Does power transfer to the cold side when the switch is turned on. Is power reaching the blower. Blowers rarely fail BUT it can happen.
Well you got ten years out of it. Put in a new one. Fuse??? Take a test light and see if there is power to the blower. Had this problem on my 1998 silverado with blower working on only high speed. Replaced the resistor, relay, and motor. Didn't help. Finally decided to use a test light to check for power. Started at connection supplying power to the blower motor switch then checked for power at each blower switch speed connector. Bingo! Bad switch. www.napaonline.com/masterpages/NOLMaster.aspx?PageId=470&LineCode=ECH&PartNumber=HC1...
You've got to use a test light to see if there is electricity getting to the switch. First check to see if it's getting past the fuse - then to the switch with the switch off - then through the switch with the switch on - finally to the blower motor.
Short in the circuit somewhere. Try unplugging the blower motor, closing the circuit with a test lead or test light, and seeing if it blows then. If not, the problem would seem to be in the blower motor itself.
The Chevy Trailblazer received a Acceptable rating from the Insurance Institute for Highway Safety, while the National Highway Traffic Safety Administration's crash test ratings ranged from three to five stars (out of five) depending on the seat.
inspect, look, listen, clean and feel A compression test will also help.
To test the blower motor resistor, unplug the resistor connector. Each blower motor switch input terminal on the resistor must have continuity to the resistor output terminal, which is connected to the circuit going to the blower motor. If the blower motor resistor continuity does not check OK, replace the faulty resistor.You need a multimeter to test the resistor block and there should be continuity between all terminals.
To replace the blower switch in a 1999 Ford E250 van, first disconnect the battery to ensure safety. Remove the dashboard panel covering the switch by unscrewing any screws and gently prying it off. Disconnect the wiring harness from the old blower switch, remove the switch from its mounting, and install the new switch by reversing the process. Finally, reattach the dashboard panel and reconnect the battery to test the new switch.