Dave68 Posted August 28, 2017 Share Posted August 28, 2017 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. Quote Link to comment Share on other sites More sharing options...
DC_Ecoboost Posted August 28, 2017 Share Posted August 28, 2017 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. Quote Link to comment Share on other sites More sharing options...
Dave68 Posted August 28, 2017 Author Share Posted August 28, 2017 (edited) 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 August 28, 2017 by Dave68 Spelling mistake Quote Link to comment Share on other sites More sharing options...
iantt Posted August 28, 2017 Share Posted August 28, 2017 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. 1 Quote Link to comment Share on other sites More sharing options...
Dave68 Posted August 28, 2017 Author Share Posted August 28, 2017 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. Quote Link to comment Share on other sites More sharing options...
Wiggy! Posted August 30, 2017 Share Posted August 30, 2017 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. Quote Link to comment Share on other sites More sharing options...
jbell Posted August 31, 2017 Share Posted August 31, 2017 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. Quote Link to comment Share on other sites More sharing options...
Adrianlynch Posted May 15 Share Posted May 15 I have a 2016 1 litre ecoboost 123bhp fiesta. When driving I found hot air coming through the vents. ( the heat was not on) I pulled over to find the coolant boiling. I have brought it to a mechanic who changed the water pump and a thermostat and told me the issue was resolved. I drove the car to work the next day approximately a 45 minute commute. I opened the hood to find the coolant bubbling again. The temperature gauge in the car shows the car isn’t overheating. Any advice on this Quote Link to comment Share on other sites More sharing options...
cjay1 Posted May 15 Share Posted May 15 Is it boiling or is it just coolant circulating through the system? 1 Quote Link to comment Share on other sites More sharing options...
Adrianlynch Posted May 15 Share Posted May 15 The coolant is circulating. And the temperature gauge on the dash isn’t showing that the car is overheating Quote Link to comment Share on other sites More sharing options...
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