Is your water pump working? Maybe its not pumping coolant through the system? I've never heard of one failing in the 1KZ-TE but its common on older petrol engines. Usually the water pump is changed as part of a timing belt kit. So if you can work out when the timing belt was last done, that might tell you the age of the water pump.Thanks for the suggestion. So far I have changed the Thermostat, Temperature Sender, Flush coolant, Radiator Cap, Fan clutch has been checked.
Temperature still go in red zone but Temperature of the coolant stay normal. Some people says bad cluster wiring or display meter malfunction.
I'm driving like this for 6 months but yesterday truck goes on limp mode and I cannot accelerate it over 40. Than it's reduces to 20km/hr.
I stopped on highway and after few minutes continue my journey at 40 km/hr.
It's goes on normal driving mode after 5 hours of parking.
Any thoughts. My next try will be coolant vacuuming.
Thanks
*Note* I just noticed your car has 180K kms. Its possible the timing belt and water pump haven't been changed yet and are probably overdue.