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Serpentine Belt with new AC and new Tensioner

(1990 Chevrolet S10)
in Bakersfield, CA on June 21, 2011
1988 s10 tahoe 4.3 v6 new air compressor, new belt derailed at compressor within 5 miles, tensioner replaced, belt replaced, belt came off at compressor again within 5 miles.
Both times truck was in reverse backing out, if this makes a difference.
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on June 21, 2011
was the ac compressor new or used?? who charged the system?? if it was overcharged, the compressor will lock up and throw the belt. you need to have a shop familiar with ac work to check and confirm.

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