air conditioner occassionally blows hot on 2004 BMW 545i

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?

Asked by for the 2004 BMW 545i
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.