GMC Canyon AC/Defroster blows cold air uncontrollably with settings off on GMC Canyon

Some GMC Canyon owners report experiencing issues with their AC/Defroster blowing cold air uncontrollably, even when the settings are turned off. This problem may be attributed to low or overcharged refrigerant levels, which can disrupt the AC system's normal operation. Additionally, a malfunctioning compressor or continuously running cooling fans can exacerbate the issue. Other potential causes include a faulty blend door actuator or a defective evaporator temperature sensor. Some owners also report problems related to the AC pressure sensor or a bad fuse or relay. To resolve these concerns, it is advisable for owners to have their refrigerant levels checked and to inspect or replace any malfunctioning components.