Over heating won’t blow hot air from the heater when on hi

Hello, a pressure test of your cooling system is the best start to figure out if there is a leak to your cooling system. There is not usually an internal engine leak in this engine, be at V-6 or V-8 depending on the model. Therefore if the coolant is getting low, it must be a leak externally. There are several other causes of cold air that require a diagnosis of a climate control system. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops