Answered: Peugeot 306 Running Cold

Q: My Peugeot 306 GTi-6 seems to be running cold, the water temperature doesn't seem to rise above 72 degrees, even when i've been driving for a good amount of time. Is something wrong?


A: Yes, but luckily it sounds like a cheap and easy fix. The water temperature is controlled by the thermostat which regulates how much coolant is allowed through to the radiator. When the engine is cold the thermostat should be completely closed and so water does not circulate around the radiator. As the car reaches operating temperature it will begin to open and as it starts to overheat it will fully open.

By opening and closing the thermostat should regulate the temperature and maintain correct coolant operating temperature.

If your car is running cold, the thermostat is stuck in the wide open position which means water is constantly running around the radiator which prevents it from getting up to the correct running temperature. If it is not stuck then the seal may be torn which will also allow water to pass through all of the time.

If this sounds like your problem then check out our easy to follow step-by-step guide on how to change the thermostat in your Peugeot 306 GTi-6 (all years).

Check out this article on "HowStuffWorks" which goes into further detail about how car cooling systems work.

One note is that this diagnosis assumes the temperature sender to your dash is working correctly, this temperature sender can be tested using a multimeter.


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