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The design of this system provides for the A/C compressor to operate in the position you are describing in order to decrease humidity in the vehicle. This is normal and should not be cause for concern. This has been a design feature on this type of vehicle since the late 70's. SDIgroup

2006-08-24 03:52:48
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Q: 1999 s10 4.3L Vortec pickup with air conditioning you were just wondering why the ac pump engages when you turn on the defrosters and turn the temperature all the way to hot. ac still works great?
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