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PostPosted: Thu Oct 11, 2018 6:44 pm 
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Car is overheating very quickly, when I take my foot off the gas cold air blows through the heater , while driving it’s hot, radiator resovouir bubbles/ gulps and hisses , engine gets very hot . Not losing water but it is obviously evaporating with the heat .


Last edited by Ged52 on Thu Oct 11, 2018 7:14 pm, edited 1 time in total.

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PostPosted: Thu Oct 11, 2018 6:58 pm 
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What year ?, your best off on a focus forum

eg. https://www.focusfanatics.com/forum/


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PostPosted: Thu Oct 11, 2018 7:04 pm 
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Sounds like a cylinder head issue ?

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For this message the author wine~o has received gratitude : Ged52
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PostPosted: Thu Oct 11, 2018 7:13 pm 
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2008 fiesta


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PostPosted: Thu Oct 11, 2018 7:29 pm 
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wine~o wrote:
Sounds like a cylinder head issue ?


Head gasket ?


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PostPosted: Fri Oct 12, 2018 6:06 am 
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possibly

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PostPosted: Fri Oct 12, 2018 10:03 am 
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I was thinking a defective thermostat or water pump. An erratic thermostat or sensor can mean that it stays closed to long and overheats. The fact that the heater is cold suggest a water circulation issue. See this video and decide if it is within your skill level to take on https://www.youtube.com/watch?v=RaA-5KHgg6I&t=9s

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PostPosted: Fri Oct 12, 2018 12:37 pm 
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Flush the whole system, its more that likely a blockage, if it still does it do a hydrocarbon sniffer test on the coolant, it could also be a bad water pump (worn impeller)


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PostPosted: Wed Oct 17, 2018 10:47 pm 
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If you are actually losing water have a look in the water header tank for a "rainbow" oil film. If you see that the head gasket may have gone, letting oil into the water galleries( or vice versa.) Also check the dipstick to see if there is any white stuff( like salad cream). If so then water is getting into the oil, again possible head gasket.
If you have a compression tester, you could try that too, and see if the pressure in any of the cylinders differs wildly from the others. All indicative of head gasket etc. Also check there is no dribble of water from the water pump, although leaks here( unless gasket) are often accompanied by bearing noise.
Make sure you have oil, and the engine is not getting too hot due to insufficient lubrication.

It MIGHT be boiling away if the radiator is clogged. If you are able, see if you can remove it and flush it through with a hosepipe in the reverse to normal flow direction. Blockages like this can sometimes happen if the engine has been run with insufficient or no antifreeze, as that also acts as a corrosion inhibitor.
Could be thermostat, but they usually stick open.

Incorrect timing or running on the wrong grade of fuel can sometimes cause over heating as well, but yours sound quite serious.

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PostPosted: Wed Oct 17, 2018 11:08 pm 
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Ged52 wrote:
radiator resovouir bubbles/ gulps and hisses


Classic symptons of head gasket failure, combustion gases from the engine cylinders are blowing in to the cooling system. As said above, a compression test by a knowledgable motor engineer will prove it.

Was there any significant event prior to this issue? Running low of coolant, burst pipe, loss of alternator belt? Head gaskets don't just go on their own, something usually causes it.


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