Toyota 3.0L V6 Thermostat Location and Replacement Overview

The thermostat on Toyota's 3.0L V6 (3VZ-FE, 1MZ-FE, etc.) is housed in a metal thermostat housing on the front of the engine block, near the top, typically bolted with two bolts. A short radiator hose connects to it.

Replacement Steps (Generic)

1. Cool engine completely; drain coolant (petcock or lower hose).
2. Remove obstructing components (air intake, brackets).
3. Unbolt housing (2 bolts); lift housing off.
4. Extract old thermostat; note orientation (jiggle valve up).
5. Clean mating surfaces; install new thermostat + new gasket/O-ring.
6. Reinstall housing, torque bolts to spec (~18–22 ft-lb).
7. Refill with correct coolant (Toyota Super Long Life or equivalent); bleed air.
8. Run to operating temp; check for leaks, verify heat output.

Consult vehicle-specific repair manual for torque specs, coolant capacity, and bleeding procedure.