wolfe10 wrote:
The answer is totally depends on the engine and what the chassis maker drives off the serpentine belt.
Our first two DP's had a separate belt driving only the water pump. Serpentine belt ran the alternator and A/C compressor.
Our current coach's serpentine belt drives water pump and alternator, with a separate belt for A/C compressor.
Please check YOUR owners manual for the information on YOUR coach.
Wolfe10 is absolutely right. It depends on your engine. I just had the serpentine go on my Cummins ISL 400 last week. The water pump quit and the engine overheated almost immediately. The A/C still worked and I'm not sure about the alternator because I shut it down right away. I called Freightliner and they couldn't give me the part number of the belt as the serpentine belt is on the engine delivered. Luckily the mechanic found a piece of the belt with the number on it. I don't see much sense in replacing you belt before it goes. Except for the two hours we spent waiting for the tow, we didn't save anything as we have Good Sam Roadside Asst. I sure as hell couldn't have replaced it myself. However, it is a good idea to keep a spare belt and probably an idler pulley too.
