This is more than likely caused by the actual fan switch. As I am English, I have no idea what a Chevrolet Trailblazer is, or what it looks like even, but there are things which are common to all or many vehicles.
if all speeds do not work id say is a fuse, but if you just dropped one or two speeds. replace the blower motor resister. sells for $60.00 at the dealer.
neither,blower resistor or blower module controls fan speeds.
Resistor on the heater blower motor has failed
If it works but not on all speeds or is almost making the car stall at idle if you turn the a/c on at a light Than its probably the fan motor resistor pack its $25-$30 at autozone and real easy and fast to replace.
The common cause is a failed blower resistor.
the fuse you have two fuse box one under hood and one under the dash.
If only the HIGH SPEED is giving trouble but not the other speeds, check the HIGH SPEED relay mounted on the firewall facing the engine on the passenger side, they burn out easily If all speeds are giving trouble could be the power source or the blower motor
u need a new blower motor
What would cause the engine not to restart when hot Chevy Trailblazer 2007?
Yes, the ignition on a trailblazer can cause head lights to work improperly.
the reason blower does not work on all speeds, is the fan blower motor resistor. The resistor is a 4-5 step series circuit, 1 resistor is added for each reduction in speed. If one burns out then so will all speeds below it. The "high" circuit usually has a separate fuse and bypasses the resistor altogether.
Come to our Trailblazer enthusiasts forum and find your answer www.trailvoy.com
I had that same problem and I had to replace my dash cluster.
A malfunctioning blower motor resistor will cause the blower motor not to work. When the resistor is bad the blower motors will not turn on.
The following can cause this problem.................. 1. Bad blower motor. 2. Bad blower motor wheel. 3. Trash in the blower housing...
There are several things that can cause your 2004 Chevy Trailblazer headlights to keep going out. The most common cause is a loose or corroded ground wire.
Blower motor NG. Blower motor resister NG. Blower motor fuse NG. Blower motor switch NG.
Check the fuses first and the blower relay.
The blower motor resistor is the common failure. It comes with the wires attached that plug directly to the blower motor itself. If there is another wiriing harness that is damaged then you will have to buy it too. The resistor failure has been linked as the only cause of the melted wires other than the blower motor itself. The motor can be tested with 12v power to it and it should run on high speed when tested.
There are several things that can cause your 2004 Chevrolet Trailblazer to idle rough. The most common causes are a dirty fuel filter or a dirty air filter.
Most likely cause is a failed blower resistor.
If you're talking about the inside blower motor you need to check the blower motor resistor and or wiring to it as it can cause this problem. Usually the slower speeds go first though. Could also be caused by the dash switch.
No, try relpacing the blower motor resistor. that is usuially what goes wrong with them when other speeds work and one or two dont. hope this helps