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Dave68

Ecoboost coolant bubbling

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I recently purchased a new Fiesta ( not very latest model ) with a petrol ecoboost 1.0.  100 engine.

After a drive round town yesterday I lifted the bonnet and noticed that the coolant in the reservoir was bubbling after I had switched the engine off. This continued for a minute or so and the fan was also running. When the fan stopped the bubbling also stopped.

The coolant level when cold is normal and the temperature gauge also shows normal when running.

Is this normal in an ecoboost engine.

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Hi Dave

I have a 1.0 Ecoboost Fiesta also, the coolant isn't actually bubbling, it sounds like maybe the water pump or some other pump, pumping hot coolant back to the reservoir to allow the engine to cool. It's done it on mine since new so I wouldn't worry. 

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Hi Daniel

thanks for your reply and explanation. Much relieved.

I suspected that it possibly was normal because the temperature gauge showed normal.

 Very pleased with the engine performance. I 

Edited by Dave68
Spelling mistake

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there is an additional electric coolant pump that pumps coolant around the turbo and back to reservoir .this is probably what your seeing with ign off. will run for a short while if sensors detect high temps.

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Hello Ian

You have explained perfectly what I was experiencing.

When I switch off after a run the main fan by the radiator switches off a few moments after engine dies. But then you can hear a fainter hum that goes on for a bit longer. When it stops the bubbling also stops.

Your explanation fits perfectly.

Thank you.

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On 28/08/2017 at 2:35 PM, iantt said:

there is an additional electric coolant pump that pumps coolant around the turbo and back to reservoir .this is probably what your seeing with ign off. will run for a short while if sensors detect high temps.

Haven't noticed this, just that these things run incredibly hot, and more worryingly what happens if this pump, or any hoses fail. 

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21 hours ago, Wiggy! said:

Haven't noticed this, just that these things run incredibly hot, and more worryingly what happens if this pump, or any hoses fail. 

What happens when the hoses fail is well documented - there was a recall on one which split under heat.

Cloud of white smoke and many, many people cooked their engines. 

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