I did another quick test. I started the ac, and unplugged the EHA.. Car idles like normal, duty cycle drops to 0%. but eco gauge stays at left where it belongs, idle does not jump every 20sec like it did with it plugged in and A/C on... didn't get a chance to test drive with unplugged eha but will soon.

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Just my MB's:
1990 420sel - Winter DD - 410,000km
1990 560sel - absolutely showroom mint - 360,000km!