Evaporator does not block the inclusion of an air conditioner if its temperature is 3.0 +-0.6 degrees. and above; the evaporator does not allow or disable the air conditioner if its temperature is 1.5 +-0.6 degrees and below. I get it. If the air intake is outside the window, minus the window, and the air conditioner is activated, it seems to have failed. Incorporating air conditioners in the winter for preventive maintenance: recycling and heat in the leg. The temperature of the environment, supposing -15, the thermostat shall be pumped into the very warm (red zone) position, the air intake is displayed from the passenger compartment, the air flow on the glass/leg, fan speed 3-4, including A/C for 10-15 minutes.
