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Originally Posted by VADIS (Volvo Aftersales Diagnostic Information System)
A timer located in the central electronic module (CEM) controls the run-on time. 50 minutes after the engine has been switched off and the ignition has been turned to position 0 or I the central electronic module (CEM) supplies power to the climate control module (CCM) and the blower fan is activated at full speed for 7 minutes. This run-on dries the evaporator and prevents bad odors.
This function is programmed at the factory, but can be deactivated in the event of customer complaints via programming of customer parameters. Programming is carried out via VIDA.
The function is only available to cars of structure week 199850 and later.
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That's what I red in VADIS about drying the system, but i found nothing about "thinking" not to run your battery flat.