380SL (107.045) V8-3.8L (116.960) (1982)
Coolant Temperature Sensor / Switch HVAC: Description and Operation
Cold Engine Lock-out (2)
The temperature switch (2) (cold engine lock) prevents the heating system from starting at a coolant temperature below 33°C in function "c" and "d" and
thereby prevents that undesired cold air blowing against passengers.