Hey there fellow drivers, so recently I have ran to this issue. To explain it as clear as possible, problem is that when car is standby (idling, not driving), heater blows cold air no matter what position it is in. When driving the car, all heater functions work as expected, hot air blows, but as soon as you stop and wait for a bit idling, cold air starts blowing (even though the engine is already warmed up and at working temperature). I have read about heater control valve issues on this model, however I'm not quite sure if it is the case here, since people with broken heater control valve usually have no hot air blowing at all, while I do (when driving). Any suggestions are appreciated!