First read and observe the introductory information
and safety warnings

WARNING
Fitting the removable ball coupling
Hitching and connecting the trailerA/C Programmer -J127
This programmer switches the refrigerant flow direction
through the second evaporator if the temperature on the cooling
fins on the second evaporator lowers to the freezing point for
water (icing protection).
...
Test Requirements
Note
The A/C system is functioning correctly when the air flowing
from the instrument panel vents has a temperature of 70C
or lower.
Setting on Climatronic “LO”.
Setting on A/C system ...
Condenser
Caution
Non-approved tools or materials such as leak sealing
additives can cause damage or malfunctions in the
system.
Only use tools and materials approved by the
manufactu ...