Hello,
This could be a problem with your vehicle's lower mode valve of the programmer for the Heating Ventilation and Air Conditioning [HVAC] Unit. In the diagrams down below I have included the diagnostic flowchart from the vehicle manufacturer for tracking down mode door problems with your vehicle. There is also a description of how your vehicle's HVAC system operates at the end for your reference. Please go through this guide and get back to us with what you are able to find out.
Thanks,
Alex
2CarPros
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Friday, November 22nd, 2019 AT 3:45 AM