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Have a 2017 Trax and when turn AC on getting nothing but hot air. Any suggestions?
 

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Do you hear the compressor coming "ON"? Did you check A/C fuse (s)? If it's still under warrant bring to the dealer if not bring it to an A/C shop. Some stuff is better left to professionals.

Do you feel tension when turning the temperature knob or is it free wheeling. Sometimes the little cable snaps, that's an easy fix.
 

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Ambient temperature sensor's only purpose in life is to show you the outside temperature and to tell the BCM to turn "ON" rear defrost and heated side mirrors if equipped if the temperature is below +3°C or ( +37°F ) when you remote start your vehicle, again if so equipped
 
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