The blower motor speed resistor is probably burned out. The resistor is available from your local auto parts store.
If you have no blower speeds at all, first check the fuse. If the fuse is okay I would suspect the blower speed switch and its electrical plug has melted. If the switch checks okay I would suspect the blower motor is bad. If you have high speed only, I would replace the blower motor speed resistor. If you have all lower blower speeds but no high speed, replace the high speed relay.
With no speeds at all, check the fuse, then check the blower speed switch and it's electrical plug.
If you have no blower speeds check the fuses, check the switch and finally check the blower motor.
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the blower fan is not working in my turck how do i fix it
This very common symptom is typical of a failed blower motor resistor. Easy fix and about $40. It is up in the blower duct behind the glove box and is accessed from below. Remove the lower kick panel and drop the glove box forward and out of the way so you can see the electrical connection to the blower motor. www.trailvoy.com All the answers for your Trailblazer from true enthusiasts!
To fix blower problems in a Ford Transit, first, check the fuse related to the blower motor and replace it if necessary. Next, inspect the blower motor resistor for any signs of damage or failure, as this can affect blower speeds. If both components are functioning correctly, examine the blower motor itself for any obstructions or electrical issues. If the problem persists, further diagnostic testing may be required to identify wiring or control module issues.
If the blower works on high speed, but not on any of the lower speeds, that usually means that the blower motor speed controller is bad. There is a resistor in there which can overheat and burn out. If the blower motor has a bad bearing (makes noise or doesn't turn as fast as it should) that would cause the system to draw more current than normal, and burn out the resistor. If that is the case, you can replace the speed controller, and that would probably fix the problem, but likely it would return in a relativly short time. Without vehicle info, a step by step instruction would be rough... But that is a place to start in you search. Hope this helps.
I had a similar problem when one of the speeds on my fan control stopped working. I had to replace the blower motor resistor. It was about $10 at the local auto shop and took about ~45mins to get it in. You could also look at the blower motor it could be blown.
Then fix it
if slave cylander is bad, it must be replaced to fix it
Switch it out to a Trane