I have a supercharged 96 Previa with 130,000 miles. About a month ago it started running warmer than normal so I thought I would replace the water pump and thermostat. Both purchased at Toyota. This did not fix the problem. The next thing I replaced was the radiator. The fan clutch seems to be ok it was replace about 40,000 miles ago. The only thing I can think of is that the hoses are collapsing and restricting flow.

I have a supercharged 96 Previa with 130,000 miles. About a month ago it started running warmer than normal so I thought I would replace the water pump and thermostat. Both purchased at Toyota. This did not fix the problem. The next thing I replaced was the radiator. The fan clutch seems to be ok it was replace about 40,000 miles ago. The only thing I can think of is that the hoses are collapsing and restricting flow.

Did you ever find out what the problem was?

try flushing you system out. could be a partial blockage somewhere internal. do a reverse flush to loosen anything(dirt, rust,and ect.).