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Where is heater control valve located on 2000 Yukon XL 4wd?

The heater control valve on a 2000 Yukon XL 4wd is located on the driver's side of the engine compartment, near the back of the engine. It is a small, black plastic valve with two hoses connected to it. One hose goes to the firewall, and the other hose goes to the heater core. The heater control valve controls the flow of coolant to the heater core, which determines how much heat is produced by the heater.
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