* Increased Load: A seized or severely restricted AC compressor creates significantly more resistance than a functioning one. This increased load on the engine puts extra stress on the drive belt, potentially causing it to slip, squeal, or even break.
* Sudden Seizing: If the compressor suddenly seizes, the sudden, immense load can snap the belt instantly.
* Not Always the Case: If the compressor is only slightly faulty or the problem is elsewhere in the AC system (like a clogged expansion valve), the belt might not be affected. The belt might only show wear and tear at a faster rate than normal.
In short, a faulty AC compressor *increases the risk* of drive belt damage, but it's not a direct, inevitable consequence. The severity of the compressor failure and the condition of the belt itself are factors.
