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Author: Subject: Head gasket or something else?
tegwin

posted on 30/5/19 at 07:58 PM Reply With Quote
Head gasket or something else?

I am having issues with a VW TDI engine.

Its been a year since it last threw a wobbly. (Oil cooler split and water pump fail followed by a sticky stat....all were replaced)


This time I am getting some odd symptoms. Long drive over the weekend and all went well until I started making my way home and the engine temp rocketed and started pishing water out of the top of the header tank. I let it cool and added about 1 litre of water and tried to drive again, under load the temperature shoots up but on the flat just ticking along the temp comes back down again slowly to normal.

Slightly curious thing is that the heater no-longer works inside. It blows cold air even though the water temp is high enough for both rad fans to come on.

Couldn't drive it back up the motorway like that so had it towed to a garage who have done a "Sniff test" and tell me the head gasket is leaking... ok... Believeable but would this really cause the heater to stop working? I am concerned its the stat or the water pump again!?


Hadn't noticed an unusual level of coolant/oil loss recently.....


Any thoughts from the learned massive on here?





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rusty nuts

posted on 30/5/19 at 08:34 PM Reply With Quote
Water pump impeller has come off , it will have damaged the thermostat as well . Common problem on VWs, the fact that the heater doesnít work is because the coolant isnít circulating.
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tegwin

posted on 30/5/19 at 08:50 PM Reply With Quote
Iíd tend to agree, bloomin livid as having the pump changed isnít cheap and I had it done a little over a year ago....

Why have the garage diagnoses a head gasket and missed the pump?!





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perksy

posted on 30/5/19 at 09:27 PM Reply With Quote
Wouldn't they have fitted the updated pump with the metal impeller though?
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tegwin

posted on 30/5/19 at 09:30 PM Reply With Quote
Iíd have thought so. It was done by an independent specialist who knows his stuff..... bizarrely the first replacement pump failed after a few weeks and allowed water into the oil. It was changed under warranty for another pump....doesnít fill me with confidence.

I believe the drive gear was also changed as it had been rubbing on something where the original pump had failed.

So yes, should have had a good quality pump and I changed the stat myself with a genuine vw one.

[Edited on 30/5/19 by tegwin]





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rusty nuts

posted on 31/5/19 at 05:46 AM Reply With Quote
Do it yourself, itís not a difficult job and the cam timing tools are available fairly cheaply.
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tegwin

posted on 1/6/19 at 07:44 AM Reply With Quote
Itís a bit of a weird engine. All gear driven but youíre right, probably should inspect the pump!





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nick205

posted on 3/6/19 at 08:36 AM Reply With Quote
quote:
Originally posted by rusty nuts
Water pump impeller has come off , it will have damaged the thermostat as well . Common problem on VWs, the fact that the heater doesnít work is because the coolant isnít circulating.



Owned and driven a fair few TDI VW (and Seat) cars over the years, not had this happen personally, but have read much of VW water pump issues where the OEM ones were fitted with plastic impellers that failed. I thought the later/replacement pumps were fitted with metal impellers and less likely to fail.

Any idea what replacement pump was fitted? Might point you towards the problem/fix.

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tegwin

posted on 3/6/19 at 08:51 AM Reply With Quote
After the original pump failed I was told they had used an OEM replacement but I have no way of checking what was actually fitted without taking the pump out. I would be very annoyed if they are plastic!!





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rusty nuts

posted on 3/6/19 at 09:34 AM Reply With Quote
Iíve had problems with VAG vehicles several times now where the symptoms are overheating when driving and the heater will not blow warm air , every time it has been the impeller causing the problem damaging at least the thermostat . It is possible to test the water pump using a pressure gauge type piece of equipment, Iíve never used one so canít say how reliable the results are.
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rusty nuts

posted on 14/6/19 at 06:24 AM Reply With Quote
Any news
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tegwin

posted on 14/6/19 at 11:37 AM Reply With Quote
Yes, I took it to the garage and suggested that before they go nuts and pull the head off that they should check the pump..

Low and behold the impeller is found to be in two pieces

A pump that has done about 8000 miles..... so annoying...

But... £500 later it should be good for another 8000 miles





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