Toyota 4Runner loud chirping or squealing noise from under glove box when AC or heat is on on Toyota 4Runner

Some Toyota 4Runner owners report experiencing a loud chirping or squealing noise coming from under the glove box when the AC or heat is on. This noise may be related to the blower motor, as increasing the blower speed sometimes stops the sound. Additionally, it could stem from a defective recirculate motor located under the glove box, which can be difficult to access for repairs. Other potential causes include a faulty blend door or blower motor, both part of the HVAC system behind the glove box. Furthermore, a loose or worn serpentine belt under the hood may also contribute to the noise, particularly if it is accompanied by shrieking sounds. To resolve these issues, owners are advised to check the blower motor and its components for damage, inspect the recirculate motor for potential repairs, examine the blend door and blower motor, and evaluate the serpentine belt's condition for necessary replacement. Addressing these concerns is crucial for ensuring the proper functioning of the Toyota 4Runner's AC and heating system.