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1989 Chevrolet R3500 Cheyenne 5.7L Hydro-boost
This one is strange. Whenever the A/C compressor is running there is a loud moaning vibration from the Hydro-boost system. It goes away as soon as the A/C cycles off or the P/S is loaded by turning the wheels. Stepping on the brakes makes no difference We ...
FIX posted 8/11/1999
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Message Closed w/FIX
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Related Documents & Media 
| VIN | 1GBHR34K9K |
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI |
| Affected | Hydro-Boost |
| Conditions | Moan, Vibration |
| Misc. | Dually, Service Body |
Message Closed w/FIX
Vehicle Data
1989 Chevrolet R3500 Cheyenne
| VIN | 1GBHR34K9K |
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI |
| Affected | Hydro-Boost |
| Conditions | Moan, Vibration |
| Misc. | Dually, Service Body |
Video