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so in another lifetime I sold parts. We had a simple way to help people determine if the belt or component was the issue. Use a plain ole bar of soap and let it rub while the belt is moving. If the noise goes away, belt is bad. Soap wont cure a bad pulley bearing, tensioner etc....

Mine is older M998 so I am not familiar with the serpentine belt set ups but there are many posts on here with the information depending on serial number, ac, and turbo from what I recall. Use your friend google but verify :cool:

I assume you have the 6.2/6.5 with v belts? check this thread for belt numbers and matched set information if not familiar with the term: https://www.steelsoldiers.com/threads/m998-hmmwv-v-belt-part-numbers.147066/page-2

Yes but it is masking the real problem probably. The rubber is older and deteriorating. The belt dressing is lubricating & softening the rubber and buying you time. I would recommend non military belts from your neighborhood parts store preferably a name brand like Dayco, Gates, Goodyear etc...