Where is the heater control valve on a 2001 Chevy blazer?

The heater control valve on a 2001 Chevy Blazer is located inside the passenger compartment, under the dashboard. It's not easily accessible without some disassembly. It's part of the HVAC (Heating, Ventilation, and Air Conditioning) system. You won't find it under the hood.

Because of its location and the need for dashboard disassembly, locating it precisely requires a repair manual specific to your 2001 Chevy Blazer. A Haynes or Chilton manual will have diagrams and instructions. Searching online for "2001 Chevy Blazer heater control valve location" along with images might also yield helpful results showing the general area and potential access points.

Keep in mind that what you might *think* is the heater valve could be something else entirely in the HVAC system. It's best to consult a repair manual or a qualified mechanic if you're unsure.