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Ordinarily there are TWO water valves in the system. One on the firewall (or passenger's inner fender) and the other inside the heater box just behind the center vents. When the first is opened water circulates through the outside of the double heater core...like a donut. Then when the center vent closes it opens the second valve, which allows water to pass through the center of the core. IF THIS VALVE ISN'T WORKING you really won't get any heat.