Temperature gauge not working properly

PAULJEWELL210982

MEMBER
2007 PEUGEOT 207
1.6L
2WD
MANUAL
67,600 MILES

When the car is warm and idling the gauge sits half way on temperature gauge which is normal. When I drive the car the gauge goes down sometimes below 70. Why is this? I found coolant is orange as if rust in there.

Friday, March 12th, 2021 AT 1:32 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

To be honest, it sounds like the thermostat is stuck open. As the engine cools, the thermostat should begin closing to restrict coolant flow. That is what keeps it at operating temp. If it is stuck open, then that won't happen/ Plus, when driving, you have a lot more airflow through the radiator which cools the engine faster.

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That is where I would start. Replace the thermostat. Because this vehicle isn't offered in the US, I don't have the specifics. However, here is a link that explains in general how it is done. It should provide a good guide for you.

https://www.2carpros.com/articles/replace-thermostat

Let me know if this helps or if you have other questions.

Take care and God Bless,

Joe