[Pasdy77]

Hi was doing quite a bit of reading on low coolant temps.

Even if it's around 10c outside my coolant temp never goes above 55c.

Is that a problem?

Thanks in advance

 

[Singhsan]

Hi was doing quite a bit of reading on low coolant temps.

Even if it's around 10c outside my coolant temp never goes above 55c.

Is that a problem?

Thanks in advance

Yes. Unlike petrol cars diesel combustion under pressure. For that combustion to be efficient it needs to operate in a environment that is suited for it.

What this means for you (and any diesel owners) is that the operating temp is at its best at 88 to 91 degrees.

When operating below this the ECU trys to compensate by adding more fuel. What this translates to is

1. Higher fuel consumption
2. Black smoke under heavy acceleration due to over fueling
3. Lower performance.

The thermostat on your car should be full open at 88c is sounds like your thermostat is fully open all the time (failed). I would suggest getting the changed and if you have one on your EGR cooler get that changed as well.