toyota sequoia model 2007 the AC knob not working....

Dear Sir
Welcome, and thank you for trusting us
The ac knob not working in your car toyota sequoia model 2007  : 

1. Fault in AC knob 
2. Compressor fault 
3. The electrecal board 
4. The wires of the ac 

To solve the problem you must check the : 

1. AC knob 
2. Check the compressor and compressor sensor 
3. Check the electrecal board 
4. The the ac wires 

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Engineer mohammad