BMW 740Li Questions

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My AC is blowing hot air please help and give me some advice to save some money thank you so much.. this is the first time that I've had any issues with my car and any advice would help out a lot thanks
What seems to make the problem better or worse? When I turn it full blast it's just all hot air..
How long have you had this problem? Just happen today
turn back on, car fine. Took to shop said I needed plugs and coils (64,000 mi). Put in coils and plugs and still does same thing. Only when it first starts up. Mechanic said needs lifter adjustment and go to BMW. Car out of warranty less than one month. Had in 3 weeks ago, told him hard to start. They had for two days, said could not find problem. I believe they lied and this is related. Is it?
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