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96 Lexus LS400 A/C on 1996 Lexus LS400

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On hot days the A/C will not cool down the car.
(2) Answers
This could be from the refrigerant being low, or other issues. I would have the a/c system checked to determine the cause.
In my car, the air blew cool, but not strong. It was the in-cabin air filter that needed changing. It is located behind the lower glove box. The previous owner didn't know about it, so never changed it. Now blows cold and strong. Hope this helps..