Whenever the EC (economy) button is not pushed or the system turned off the air conditioner is switched on. The compressor will cycle to keep the evaporator at the same temp, and the monovalve will cycle to warm the heater core / air from the evaporator to keep the car at the setpoint.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.