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This is typical of the heater valve failing. Either due to a vacuum leak in the system or the valve itself. Many people (including myself) either bypass the heater core completely, or cable tie the heater valve shut.
This is typical of the heater valve failing. Either due to a vacuum leak in the system or the valve itself. Many people (including myself) either bypass the heater core completely, or cable tie the heater valve shut.
Unless you live somewhere it gets cold, then the only option is to fix it the right way.