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2007 S550
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My 240D would really pull down when the A/C was running, the trick is to turn off the compressor when you need the extra power. If I came to a stop I'd kick off the compressor until I got back up to speed and re-ingage it. The same rule applied to the rare passing situation on the highway. :) My 240 is almost 2 tons rolling down the road with a 90HP diesel engine, I expect it to load up when the A/C is on, it's just the nature of the beast. Hardly a factor on my 300 turbo.
 
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