Toyota Corolla 2.0D overheating after replacing thermostat valve

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Toyota Corolla 2.0D overheating after replacing thermostat valve

I recently bought a 2001 Toyota Corolla 2.0D with a 2C diesel engine. As I have owned the same car previously, I was aware of some maintenance issues. Today, I changed the timing belt as I was unsure if the previous owner had done so. The car has 124,000 on the clock and was in the possession of the first owner, who had maintained it well.

However, the radiator wasnt very clean, so I decided to service it. I also found that the thermostat valve wasnt working, so I bought another one and replaced it. After leaving the mechanic shop, the car started overheating. I managed to drive it back home, but the temperature gauge showed that it had overheated up to the H level. I believe that the new thermostat valve isnt working, as it remained closed.

I plan to remove the faulty thermostat valve tomorrow, but I am worried about the engine o r head gasket. Could someone please enlighten me if I need to be concerned about these issues o r if removing the faulty thermostat valve will be sufficient?

Thanks in advance for your help.

Sumaiya Akbar asked on 02 Mar 2023 14:45:54 pm

1 Answer

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Sumaiya Akbar - on 06 Mar 2023 15:37:27 pm

It seems that during the installation of the thermostat, its important to locate the jiddle/dudder valve in the top position. After installation, the system needs to be purged of air while the engine idles and warms up.

It sounds like you may have encountered someone who is not knowledgeable about modern cooling systems. They may believe that radiators must be dismantled to be cleaned, while overlooking the cooling channels in the engine itself.