Overnight failure.
#1. Check for failed A/C Lock-Out Sensor.
#2. Check for failed A/C Pressure Switch, 2 bar low pressure and 30 bar high pressure binary switch. Located on reciever-drier with 2 spade terminals. Used for compressor cut-out.

#3. Check for failed A/C Evap Temp Sensor.
#4. Check system pressure.

#5. Possible failed Climate Control Unit.
#6. Possible failed A/C Compressor clutch.

__________________
ASE Master Mechanic

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D

https://www.boldegoist.com/