When to replace the thermostat on 2002 Camry V6?

[hightech]

I replaced the water pump and timing belt on my 2002 Camry LE V6, but the dealer did not replace the thermostat. The car seems to be working correctly, but I am just wondering when should I replace the thermostat? I have about 148,000 km on the car now.

[hightech]

anyone?

[Maxspeed]

if it aint broke dont fix it ?

[DragonZealot]

The thermostat is not a maintenance item. You replace it when it is not working.