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Where is the heater control valve on a 1989 s-10 truck?

1. Locate the radiator hose that runs from the engine to the heater core.

2. Follow the hose to the firewall.

3. The heater control valve is located on the firewall, near the heater core.

4. It is usually a small, round device with a lever or knob that controls the flow of coolant through the heater core.