on the firewall, whree the heater hose goes into the car there is a lever with a cable on it. just pull/push the levere to switch the coolant on or off from the heater core.
There is also another lever under the dash on the heater core box just follow the othe cable that controls the temperature. The one on the firewall just lets the coolent into the core. the one on the care regulates the temp.
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