My car is only blowing hot air. What should I
do? It is a 2006 Mercury Milan
Could be that the refrigerant is low and needs to be recharged. Or it could be a defect in the compressor, or the high or low pressure switch, the clutch relay, or activation switch, or something else. If AC system is OK, could be a defective actuator in the blend/mode door causing the door to stick on heat.