ARRRGG... 17 degrees Thats harsh.
I think I would look for a way to get 12v to the motor directly. On the W123 theres a plug on the firewall where you can unglug the motor.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"