If the salon is warming more than half an hour, the specialists are talking about a possible air jam in the heating system. To eliminate it, you can try to travel some time at higher engine speeds.
Another possible cause is a thermostat failure. It is possible to check if this is possible if after 40 minutes the air ducts will be directed to themselves and recorded the air temperature-it should be hot. If it's warm, the thermostat is probably not right.
