climate control

i have a 94 E36is with dual rotary climate control that has the following problem: flaps will not move correctly, and whenever i switch the air to window or below it comes out hot... if i select to come frontward it is ok. When outside temp reaches 105F in traffic, it does not cool down eventhough and heat will also appear (just replaced heater valve which improoved a bit but has not solved the problem). Dealer took a wild guess and asked me to replace the air box, has anyone had this recomendation?

Was also advised to replace a heater/ac control module... does rotary a/c even has this module?

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Pedro
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