Do you need to remove the throttle boddie replace themostat on a 97 Chevy lumina?

No, you generally do not need to remove the throttle body to replace the thermostat on a 1997 Chevy Lumina. The thermostat housing is typically located on the engine block, separate from the throttle body. Access to the thermostat is usually from the top of the engine, requiring removal of some coolant hoses and possibly the thermostat housing itself, but not the throttle body.