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My 2014 QX60 AWD 50k miles, A/C suddenly stopped cooling. Only blows warm air. SO says he hears it calling for the compressor, but nothing happens. He thinks it may be a bad switch. It was working fine when I last drove it 3 days ago. Any ideas?
 

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Once air conditioning system pressure - the charge of R134 gas - drops below a certain threshold, the system stops working to prevent damage. Get it tested, they will have to inspect and at least introduce a dye to system to help spot leaks.
 
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