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2003 Lexus GS430
Question: Car is stuck on defrost. Won't blow heat or air The two middle vents don't work.
Answer #1patrick mannion from Greg Solow's Engine Room, September 12, 2011, 19:34Master
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.