Quote:
Originally Posted by pap smear
Is there any way you can have both driver and passenger side temps to adjust the same time?
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The 1st method that comes to mind is to spread two fingers on the same hand wide enough so that you're touching both driver/pass temp button/arrows at the same time, then press each button at the same time.

Obviously I have no official method...just the aforementioned kludge.
The e39 & e53 share the same IHKA control unit...so info belw applies to both: