The 2001 Chevy Blazer 4.3L doesn't have a single, easily accessible "thermostat" in the way you might think of a home thermostat. Instead, it has a
engine coolant thermostat that's a mechanical part regulating coolant flow. Its location is within the engine's cooling system, usually near the engine block's water outlet, often requiring some disassembly to access. You'll generally need to consult a repair manual specific to your year and model Blazer for precise location instructions and removal procedure. Searching online for "2001 Chevy Blazer 4.3L engine coolant thermostat location" with images will likely yield helpful diagrams.
The "computer chip" (more accurately, the Engine Control Module or ECM) is usually located under the dashboard, but the precise location varies by trim level. It's often secured and protected, sometimes under a cover or within a compartment near the firewall. Again, a repair manual specific to your Blazer is crucial for locating it correctly. The ECM is a complex component, and attempting to access or manipulate it without appropriate knowledge could cause damage.
