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Keep cool, engine on or off

by Christine & Scott Gable
for About.com

2007 Honda Accord Hybrid dual drive AC compressor

The dual scroll pump mechanical/electric A/C compressor.

photo © Adrian Gable
Honda employs a unique dual scroll system for the Accord's climate control system. The A/C compressor is a two part unit consisting of an engine belt driven scroll pump in front and a smaller electric motor driven pump in the rear. When the engine shuts down in Auto Stop mode, the smaller rear pump continues to run on power supplied by the hybrid battery. When the engine restarts, the front belt driven pump takes over. And, under high load conditions, both pumps can and do work simultaneously.

Read more: 2007 Honda Accord Hybrid test drive and review
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