GMC 12634319 Belt, Generator & A/C Compressor

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The serpentine drivebelt at the engine front drives the alternator and AC compressor and needs regular checks for wear, cracks, and fraying. Minor cracks don't necessitate immediate replacement. To replace the belt, loosen the right front wheel lug nuts, raise the vehicle, and remove the belt from the pulleys. Install the new belt, ensuring it fits all grooves, and release the tensioner. If replacing the tensioner, remove the drivebelt and tensioner bolt(s) first, then replace and reinstall in reverse order.

It is important to periodically inspect the belt for wear, as it is prone to cracks, separation, fraying, and glazing.

To replace the belt, the air filter housing may need to be removed, and on V6 models, the engine may need to be supported and the right-side engine mount and bracket removed. A 3/8-inch drive ratchet or breaker bar can be inserted into the square hole in the tensioner to release belt tension. The old belt can then be removed, and the new belt can be installed by routing it over the pulleys and using the tensioner to allow for installation.