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I'm having 2013 Ford Fiesta and I've noticed that when I set my AC to 23 C it doesn't blow cool air much, but when I lower the setting to 20/19 C then the cold air continually flows.

Six months ago I serviced a car and they told me it's my thermostat but I didn't have time to leave the car for change so I postponed to another service. On last week's service (in the different service center) I asked the guys to check AC again and see what needs to be changed and they told me this time it's my compressor failing and I need to replace it.

What I was able to read from internet, if AC compressor is failing I wouldn't be able to get cool air at any setting inside the car so I'm confused now as to what would be an actual problem. Could AC compressor work only partially and explanation from last week in the service center be plausible or would it really be just a thermostat problem?

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No, it's not faulty. If your system blows plenty of cold air then the compressor works. If it isn't coming on when unless the temperature is set low then something else is wrong, the thermostat is a likely culprit, but not the only possible one.

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  • Could you please share what could be other culprits besides thermostat? I'm just trying to understand this problem better so I can talk to the mechanic next time I visit. – MK86 May 26 at 13:45
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    Go to a different mechanic! If this one is telling you the compressor is bad when it isn't it could be a rip-off joint. – GdD May 26 at 13:47

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