Q: AC not blowing cold air in 2003 Toyota Matrix

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My AC does not work. It will not blow cold air.

If the AC light is flashing and the air is coming out warm the problem might be a faulty AC compressor clutch relay. There is a technical service bulletin published by Toyota that has an updated relay part number to replace the faulty one with. Now if there is no flashing light then the problem is most likely not the relay. An AC gauge set will need to be installed and performance test run on the AC system to determine possible issues. You may want to enlist the help of a mechanic, such as one from YourMechanic, who has the training, certification, and equipment to accurately and safely service your AC system.

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