Citroen XM Forum

What does your coolant temperature usually show. I have been thinkin becouse mine allways shows 100-110. Sounds pretty high or is it just normal. Usually closer to 100 (arrow pointing straight up. At citys hot days coolant can reach110 and oil 110. It has been like this allways and nothing wrong while driving. At some XM videos I have seen it seems to be allways the same

I presume that you are asking about a V6 (ES9). Having owned 4 Xantia and 2 XM with this engine, I would say that the indicated water temperature always stays between 85 and 95 degrees, depending on the ambient temperature and airflow through the radiator. The indicated temperature varies more than the actual coolant temperature due to the location of the sensor on the engine.
Before getting too worried, I would suggest that you should check the actual temperature with an infrared thermometer or camera..

The oil temperature varies a lot depending on ambient temperature and driving conditions. Cruising at motorway speeds on a swarm day, I would expect 100 to 110 degrees but on a really hot day it could be 20 degrees more.

Thanks for the reply. I think I start by flushing the system, and change thermostat at the same time. Time to change coolant anyway At the moment I have evans waterles coolant in system. I may go back to original greenstuff

I would advise you to check the thermostat by measuring the temperature of the top radiator hose before changing the thermostat, as it is quite a job and you will be annoyed if it doesn't change the behaviour (I was).

Mckone83 wrote: ↑

Tue Jun 09, 2026 3:55 am

At the moment I have evans waterles coolant in system.

There is your problem. Waterless coolant is just Ethylene glycol. The water in the coolant mix is what performs the cooling function due to it's extremely high specific heat index and good thermal conductivity.

Don't go past 50% water/antifreeze concentrate. In very cold climates, one might stretch that to 55%, but that should be regarded as an absolute figure.