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Old 06-21-2021, 07:37 AM   #1
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Lost a new Belt

Lost a brand new belt yesterday. Looking for thoughts on what happened. A little background information. This is a 1999 Magna with a CAT C-10 engine. We have had this coach for 2 years and no belt issues. We get an oil change at a CAT shop and they recommended a new belt. We agreed, it did need to be replaced. New one rips apart after about 200 miles. All pulleys are spinning freely, including the AC compressor, with the engine off. I put the old one back on and it got us down the road. I have 3 working theories. First just a bad belt, maybe the shop put on the wrong belt. A third theory is our dash AC stopping working a while ago but I tried to turn it on while going down the road to maybe get some air flowing with the fan at least. Could the bad AC have contributed to the fail of the belt? Your thoughts are appreciated.
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Old 06-21-2021, 09:22 AM   #2
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Even though your A/C was spinning in the off position, when you turned it on it engaged the clutch, if the compressor is locked up, the pulley then stopped turning and burned up your brand new belt. That is my guess. Locked up compressor in likely why your dash A/C does not work.
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Old 06-21-2021, 10:12 AM   #3
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Originally Posted by dfuelman View Post
Even though your A/C was spinning in the off position, when you turned it on it engaged the clutch, if the compressor is locked up, the pulley then stopped turning and burned up your brand new belt. That is my guess. Locked up compressor in likely why your dash A/C does not work.
Agree^^, most likely reason. You got a false reading on the A/C compressor by spinning the pulley with the engine off and electric clutch disengaged.
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Old 06-21-2021, 04:47 PM   #4
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Pull the wire off your AC clutch so this doesn't happen again.
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Old 06-22-2021, 05:58 AM   #5
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Pull the wire off your AC clutch so this doesn't happen again.
Good advice. Thank you.
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Old 06-22-2021, 10:03 PM   #6
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Agree the AC pulley ate your belt. Running the fan is a separate function and you don’t need the AC turned on to get fresh air.
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