Very common problem. It's your blower motor resistor up under the dash behind the glove box mounted to bottom of blower motor. Do yourself a favor and replace the resistor and the pigtail that goes into it. Common for both to melt.
Could be the blower motor going bad.or a wire not getting good contact.
SOURCE: gmc Envoy with erratic fuel gauge.
I have found that just about 100% of the time this condition is caused by a defective fuel gauge sending unit in the gas tank.
SOURCE: 2003 GMC Yukon XL Denali Service Ride control info
leaking suspension air bags is the most common cause, but the system can be tested for trouble codes, I suggest u do so, only the dealer can do this, but guessing about what the problem is can get very expensive very fast.
SOURCE: Climate control air conditioner stops working due to incorrect ambient air temperature
Same car, same problem. Press MODE, FRONT and REAR buttons together to reset tempreture. You probably need to replace the sensor GM part number 15047946 it is in the front grill email me for a picture. [email protected]
SOURCE: climate control does not work on my Mercedes ML 320 suv
check the following. #1, it could be the flap soliniods. This is located behind the dash on the heater box. This operates the flpas to regulate hot and cold air. The clicking sound could meen that it's trying to operate but can not due to a dying motor. You need to check which one is faulty. from memory there is about 4 or 5. #2. Behind the a/c fan speed control there is small plug. Sometimes this can be left unplugged if someone has worked on the car. e.g installing a new Radio/cd player etc.
good luck.
SOURCE: How do you fix the driver side air blend door actuator?
you cannot repair the actuator you need to replace it with new one. These motors turn but get weak with time. if you test it, it works, put it in and it doesn't. this is because the motor is weak, unfortunately GM does not sell these motors separately.
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