Q: Coolant leak and heater is not functioning

Hello. If your engine is leaking coolant then it is likely causing, at least partially, your heater malfunctions. The heater uses engine coolant to generate heat and if the engine is leaking or runs low the coolant may not reach the heater, which will cause it to not function properly. The same can also be caused by other issues, such as a faulty heater control valve, or a bad blend door actuator. A leak near the belts may be coming from a few different places, possibly the water pump, water outlets, or even from the intake manifold. As engine leaks could quickly lead to overheating, I would recommend having a professional technician such as one from YourMechanic, come to your location to diagnose the source of your leak, as well as the exact cause of your heater issues.