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Q:

air conditioner occassionally blows hot on 2004 BMW 545i

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My airconditioner every now and then decides not to blow cold. Is likely to be a faulty thermostat or does anyone know if there is a common fault?
(1) Answer
Sounds like you do have a thermostatic valve fault. Try asking your local repair facility to check the amount of freon in the system first because low amounst of freon can cause similar symptoms. Good luck.