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It's a good practice to start with the refrigerant. These computer controlled systems do odd things when the refrigerant level is low. I have seen: warm air distribution from half of the vehicle vents, temp sensor faults, and stepper motor potentiometer faults caused by low refrigerant levels. Clear all faults after recharging. Once you know that the system has the proper charge you can check faults in the climate control system and work through the relevant test plans.
- Casey
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