Been havin a problem with my 22r recently. Water Temp gets super hot, almost to the point of overheating, doesn't matter if im givin it tons of gas or just idling it heats up real good. Once its super hot, the heater doesn't blow hot air. Radiator was replaced maybe 7 months ago, water pump isn't leaking, and I cant see any leaks around any of the rad hoses.. could it be heater core, thermostat? Any ideas?