Model: Santa Fe
Engine Size: 3.3 L
Country of Origin: United States
Today I briefly turned the heat on since the outdoor temp was cool. Later in the day, I resumed the A/C AUTO setting at 72 for BOTH sides of upper vent outlets. I soon noticed that the driver's side blows warm air and the passenger side blows cold air as it should. No amount of adjusting the temp control either up or down had any effect on the driver's side except for constant warm air. Now I know the passenger side can be adjusted separately but both sides were set for the same temp. Never had this happen before. Always before, if I wanted warm air, the warm air would come through the floor outlets. What's causing warm air to come out the top driver's side vents when it should be cold? Could a diverter door be stuck? or a malfunctioning sensor? Any help would be appreciated.
There is 4 different sensors that can control this issues. AS well as blend door issues.
Don't forget that low refrigerant charge can cause this...
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
On what GM Tech said, you could feel the suction line under the hood, if it is not cold, there isn't enough refrigerant to keep the the whole evaporator cold.
On what GM Tech said, check by feeling the suction line under the hood, if it is not cold, there isn't enough refrigerant to keep the the whole evaporator cold.
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