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2007 Fiesta 1.6 Diesel Overheating Problem

fiesta diesel tdci 2007 mk6 overheating head gasket

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#1 new_horizon

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Posted 03 January 2013 - 09:45 AM

Hi All,

I've recently purchased a 2007 Fiesta TDCi with 35k on the clock and think I may have got more than I bargained for.

A bit of background on the car - it is one lady owner from new, has only covered 37k and has full service history (not Ford). In general, the car is in excellent condition and appears to have been well maintained.

When I purchased the car, the lady told me that the car overheated intermittently at around 70 mph. I took it on a test drive and was unable to replicate the problem despite several attempts. She said that the garage had told her that the thermostat was the likely culprit.

Anyway, as I was driving it home on the M25, the temperature gauge shot up so I quickly pulled over. The car cooled down almost immediately and the needle plumetted back to half way. I drove it again and kept it at 50 mph with no issue. I was able to drive at 70 mph with the heaters on full and the windows dropped for the hour long drive home.

I had the thermostat changed and the problem persisted...this to me suggests that I may have bought a bigger problem. So my questions are...

1) Has anyone experienced anything similar on the TDCi engine?
2) Can anyone offer any advise on the likely culprit? I'm arranging for a pressure test to be carried out on the engine next week as I've been told by a mechanic friend that the engines are the same as the Peugeot and may have a head gasket issue.

I'm expecting head gasket or waterpump to be honest, but would rather save time and money by getting some advice from the forum.

Any help is much appreciated,

Best wishes,

Mark

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#2 DieselPig

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Posted 03 January 2013 - 02:08 PM

You say it cooled down almost immediately! Sounds more like a bad connection to the engine temperature sensor or a dicky sensor.

If the head gasket is blown it would be using water and blowing it out of the expansion tank. Check the colour of the water in the expansion tank, should be clean and oil free.

#3 new_horizon

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Posted 03 January 2013 - 10:43 PM

Thanks for your reply. How can I check a faulty sensor? I replaced the thermostat and thermostat housing, which I thought would have fixed this issue...

Yeah pretty immediately-I'd say it takes 20 seconds to completely return to normal temperature...

I haven't noticed any water loss and the water is clean. Compression test happening on Monday. I just can't believe a head gasket on a car with so few miles

#4 DieselPig

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Posted 03 January 2013 - 11:53 PM

Sensor itself is cheap, check the connection first may just be loose or corroded. Get the garage to test it.

#5 new_horizon

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Posted 04 January 2013 - 11:59 PM

Hmm noticed today that the top radiator hose is hot but the bottom one is stone cold under normal operating temperature. Suggests a circulation issue-blocked radiator or perhaps inefficient water pump?

#6 b1g_dav3

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Posted 05 January 2013 - 12:04 AM

Not sure on the Mk6's, but the pump's on the Mk7's are junk.

Have a look on it for signs of corrosion, as there's no way under the use it's had it should have wear and tear on your parts really. Only thing I can think of is corrosion on the thermostat (which has been swapped out) or water pump. Is the fan kicking in when the heat's going up?

#7 DieselPig

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Posted 05 January 2013 - 09:40 AM

Bit young for water pump failure! Could be the old problem of the impeller parting company with the shaft and therefore no circulation.

#8 b1g_dav3

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Posted 05 January 2013 - 11:27 AM

You say that, yet I had my water pump changed at 14k :P although I heard the problem of it at about 1500 miles but the useless dealer said oh no nothing's wrong...

#9 DieselPig

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Posted 05 January 2013 - 03:47 PM

Luck of the draw really, in 35+ years of motoring I've only replaced one water pump at 128K miles on a Fiesta.

#10 new_horizon

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Posted 05 January 2013 - 07:58 PM

I'll check the waterpump for corrosion when I get a second-I wouldn't have thought that at 36k much should be failing at all but I suppose you never know!

The fan is cutting in and out as it should be so we can rule that and the thermostat out...

Ideas are welcome as always as I think I'm going to have to change the waterpump-which is going to be quite costly I'd imagine on labour

#11 new_horizon

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Posted 05 January 2013 - 08:08 PM

Can I ask what might be a slightly naive question? If the waterpump was indeed at fault-would the car not overheat at other speeds? Just throwing it out there as it's only 50 mph +

#12 DieselPig

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Posted 05 January 2013 - 09:00 PM

Assume the pump has failed there may be some impeller movement so a bit of water is moving plus there is the thermo syphon principle involved. Many moons ago cars did not have water pumps but relied on this principle, bit different now with a small car producing 100 HP and lots of heat!

A mate had a Mondeo V6 with the same symptoms and the plastic impeller had split, it was still on the shaft but at high speed it was not rotating quick enough to move the water through the radiator and hence it would overheat, new pump problem fixed.

#13 stef123

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Posted 05 January 2013 - 09:10 PM

these engines will have an oil cooler? is it possible its lacking oil flow or the thermostat for it is stuck? when the engine is working hard to keep the car going at speed the oil must be getting pretty hot..

just an idea if its not water pump or radiator thermostat related.

#14 new_horizon

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Posted 06 January 2013 - 12:52 PM

Thanks Stef and Diesel. I think it's going to have to be a new waterpump-do you have any idea if this requires the cambelt having to come off?

Your advice has been really appreciated

#15 mike.900

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Posted 25 April 2014 - 04:57 PM



Hi Mark,



It might be worth an internet search on your specific vehicle or indeed the
specific engine type!

 

Then look for known or common problems.

 

The vehicle identification numbers should tell you all that you need to know!

 

You will need to find and decipher this information, (a hole load of numbers and a
few letters) either via the internet or a good old Haynes Manual under Buying
Spare Parts. Vehicle identification numbers.

 

I hope this is of some help!

 

 

I had a Rover Metro with intermittent overheating problems, it seems that the
"first production" run of the vehicles were "at risk" of
this problem, which was due to the engine. Apparently the piston "cylinders" are
made of steel and are shrunk fitted into an aluminium engine block.

This, at certain temperatures could cause leaks from the combustion chamber(s) into the engines Water Cooling Jacket, this would overpressureise the cooling system, thus causing rapid water loss followed by overheating!

 

Providing quick enough response to this occurrence i.e. stop, cool down and top up water, as the fault is intermittent it should be tolerable.

 

P.S.
For those people that experienced or can remember the B.L. Metro's, I can
assure you that the Rover Metro was light years away from it, I'm glad to say! Sadly shot it's
self in the foot with the iffy engine.

 

Regards
Mike.900


 



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