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Car is stuck on defrost. Won't blow heat or air The two middle vents don't work. on 2003 Lexus GS430

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(1) Answer
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A Lexus Scan tool and some professional grade scan tools have the capability to read trouble codes and carry out diagnostics on the heating/climate control on your car. The system uses servo motors, electronic control unit, and a controller. Hard to guess what wrong without being able to carry out tests on the system.