Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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E. Electronic Switching Unit For Temperature Control









The electronic switching unit is available in two versions. For cars with the auxiliary heating water pump an internal relay is provided in the switching unit for controlling the pump (9). The relay, as well as the connection terminal 4, are not provided on cars without the auxiliary heating water pump.







Layout of switching unit
2 Temperature selector, left
3 Temperature selector, right
9 Electronic switching unit
14 Switch-over valve for main air flap (only with air conditioning)