When does the overheating occurs?
Have you checked if there are still air trapped in system?
How high is the temperature gauge showing when you mean overheating?
Does the reading lowers when A/C is turned on?
The fans are good if they come on when the A/Cond is turned on. What you need to check would be the relays and controls such as the temperature switch that turns on the relays when the operating temperature is reached.
Toyota utilises a few relays for the fan controls and if one is bad, it would affect the system. This is shown by the fan running when you fiddle with the relay. Presently I am not able to access our database for the wiring circuit so this is not going to be easy for me to explain as I am not sure of the actual system used for your vehicle. Toyota has a few different system for different models and year There should be 3 relays for the fans, 1 for each fan and the third for controlling both
When the temperature gauge shows high, check and confirm if the upper and lower hoses at radiator are almost equal in temperature. Be careful when working on a hot engine.
Friday, November 3rd, 2017 AT 10:44 PM