The climate control of BMW 5 E60 incorrectly distributes cold and hot air flows

When the BMW 5 E60 from the climate control system in one direction (towards the driver or passenger) only blows cold air, the problem is likely to be the problem of the heater valve failure. If there is only one side, it is necessary to check whether the actuators of the heater work. The optimal solution in both situations is to run diagnostics.