In my first Celica (which had <100hp left) turning on the A/C had no noticeable loss of power, same thing in my wifes Matrix. OPs E550 has 4x the power of both of those so I can't imagine a properly functioning one feeling any noticeable loss from the A/C being on.
Quote:
Originally Posted by ime2006
so....
- Just having HVAC running (AC off), car runs fine.
- AC (or Heater) on, at idle Engine load goes from 11% to 16%
- AC Compressor / Clutch also just got replaced. Which means, problem is not on the Compressor.
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What are you changing to go from HVAC running to heater on? Are you just changing the temperature setting or is the fan speed changing too?