When it becomes loud or starts leaking. You can also change it if you have to do timing belt due to you have to take everything off anyway
You'll have to take off the water pump because that is where the thermostat is.
I got it for $17 at napa auto parts. you should also replace the water pump while changing the belt. the pump is about $29 at advance auto parts. good luck.
Replace it with a new one.
How often should you change water pump in a boat
You should replace the water pump on a 1999 Toyota Avalon when it becomes worn out. You can also replace it when it begins leaking.
replace water pump on a 1994 rodeo replace water pump on a 1994 rodeo replace water pump on a 1994 rodeo replace water pump on a 1994 rodeo 6 cylinder
The water pump should only be replaced when you hear signs of the pump failing, i.e: bearings on the pulley are squeaking.
water pump
Replace water pump and gasket
Only replace the water pump if you have a visible external leak, the water pump bearings are bad, or the shaft is broken.
This is NOT an Interference engine. The water pump is driven by the cam belt so replace the water pump at the same time you replace the cam belt. Belt should be replaced at 105,000 miles.This is NOT an Interference engine. The water pump is driven by the cam belt so replace the water pump at the same time you replace the cam belt. Belt should be replaced at 105,000 miles.
About 1100 (Nissan dealer quote) that's water pump timing belt and th rest of the parts you need, I'm sure you could find it a little cheaper .