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temperature gauge sometimes over 100°

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Is it the gauge that's faulty? I've changed the thermostat.
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A failed thermostat will hardly ever cause over heating, they are designed to fail open so the car will just run cold and not cause any short term damage.

You dont say which engine you have but your problem is most likely a coolant leak, faulty water pump or a blocked or corroded radiator
 

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Discussion Starter · #4 ·
just checked radiator, it's all messed up and broken. The big one is for water, and the small one for climate?
Could that be the reason of overheating? The air just flows through I guess, without cooling as the ribs are not even there.
I've got 1.9 JTD 2003.
 

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You can see the coolant rad if you look forward through the fan blades, the rad you can see if you look from the front is the aircon rad. if you have a/c fitted of course.

If your rad is badly corroded with the cooling fins missing then that is probably your problem
 
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