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[TheBoy]

Those that have followed the saga know that we found the intercooler fan was seized.  Today, I have managed to free it off by initially turning by hand, and then by connecting up one of those 12v jump starters for 30mins. Jobs a good 'un

Also, checked the tensioner, as suggested by Omegatoy - apparently its common for them to seize. Mine was free-ish, but I greased it up anyway. Had to go out to buy the tool required though.

I think the viscous fan is knackered - I noticed it becomes easier to turn by hand when it gets hot, and when turning off the engine when hot, the fan spins itself for about 30s.  This is not my (limited) understanding of viscous fans.

So I took it for a spin with the electric fans wired up permently (on low setting).  Better, but stilling getting too hot, so I think something else is still causing a problem.

I've also tried a petrol expansion tank, but can't seem to get a good enough seal on the 'extra' pipe, so can't test further until I get a bigger bolt and some better jubilee clip.

When it gets hot, I get lots of tiny bubbles in coolant, so I think it is boiling in places when under load.  Therefore I think the coolant isn't flowing fast enough, so back to radiator theory.

So, next things to try is a different viscous fan, and a different (hopefully better) radiator.

Any further ideas?

[tunnie]

when at Omegatoy's he pointed out the poor circulation of coolant in the header tank, when reved it hardly moved.

So think a block some ware.....

[Marks DTM Calib]

I say radiator.....but then I always did say radiator.....

[TheBoy]

I say radiator.....but then I always did say radiator.....

I am inclined to agree, mainly due because I can't see what else it could be...

Whats your view on my viscous? Donald D'd?

[Omegatoy]

I say radiator.....but then I always did say radiator.....

Its what i said on seeing it the first time! but suggested the thermostat as the flow appeared to be very poor, then i got sidetracked with another td which has similar symptoms, and suggested that as a possible cause which the boy tried as described above, Butr the worry is if the other one im having probs with has the same symptoms I shall end up having to get a new radiator too!!!!! arrgghhhh discount for 2 from anywhere???

[Taxi_Driver]

Just my 2 penny worth....viscous fans are crap.....you said in an earlier post that you could hear the fan....sounded to me that the fan was on all he time...hence the noise from it....from my experience viscous fans either dont work or are on all the time....

Heres an experiment....if you are feeling brave....or talk Tunnie in to it  

When the engine is hot....viscous fan should be running with some power....so put on gardening gloves...leather ones....or put them on Tunnie   and try to stop the fan.....if you can stop the fan fairly easily....then its fubared!

[Omegatoy]

Just my 2 penny worth....viscous fans are crap.....you said in an earlier post that you could hear the fan....sounded to me that the fan was on all he time...hence the noise from it....from my experience viscous fans either dont work or are on all the time....

Heres an experiment....if you are feeling brave....or talk Tunnie in to it  

When the engine is hot....viscous fan should be running with some power....so put on gardening gloves...leather ones....or put them on Tunnie   and try to stop the fan.....if you can stop the fan fairly easily....then its fubared!

thats just plain daft!!! easy trest is when the engine is hot get a carrot and hold it at eh fan blades if the fan chops through the carrot the fan is working if the carrot stops the fan it aint!!!
Omegatoy

[Taxi_Driver]

Just my 2 penny worth....viscous fans are crap.....you said in an earlier post that you could hear the fan....sounded to me that the fan was on all he time...hence the noise from it....from my experience viscous fans either dont work or are on all the time....

Heres an experiment....if you are feeling brave....or talk Tunnie in to it  

When the engine is hot....viscous fan should be running with some power....so put on gardening gloves...leather ones....or put them on Tunnie   and try to stop the fan.....if you can stop the fan fairly easily....then its fubared!

thats just plain daft!!! easy trest is when the engine is hot get a carrot and hold it at eh fan blades if the fan chops through the carrot the fan is working if the carrot stops the fan it aint!!!
Omegatoy

Can you clarify Omegatoy.....is that a raw carrot or a cooked one  :-/

[TheBoy]

Though if its easy to spin when hot, is that a good enough test?

[Omegatoy]

Just my 2 penny worth....viscous fans are crap.....you said in an earlier post that you could hear the fan....sounded to me that the fan was on all he time...hence the noise from it....from my experience viscous fans either dont work or are on all the time....

Heres an experiment....if you are feeling brave....or talk Tunnie in to it  

When the engine is hot....viscous fan should be running with some power....so put on gardening gloves...leather ones....or put them on Tunnie   and try to stop the fan.....if you can stop the fan fairly easily....then its fubared!

thats just plain daft!!! easy trest is when the engine is hot get a carrot and hold it at eh fan blades if the fan chops through the carrot the fan is working if the carrot stops the fan it aint!!!
Omegatoy

Can you clarify Omegatoy.....is that a raw carrot or a cooked one  :-/

well the boys td gets hot enough to cook it!!!!

[TheBoy]

Just my 2 penny worth....viscous fans are crap.....you said in an earlier post that you could hear the fan....sounded to me that the fan was on all he time...hence the noise from it....from my experience viscous fans either dont work or are on all the time....

Heres an experiment....if you are feeling brave....or talk Tunnie in to it  

When the engine is hot....viscous fan should be running with some power....so put on gardening gloves...leather ones....or put them on Tunnie   and try to stop the fan.....if you can stop the fan fairly easily....then its fubared!

thats just plain daft!!! easy trest is when the engine is hot get a carrot and hold it at eh fan blades if the fan chops through the carrot the fan is working if the carrot stops the fan it aint!!!
Omegatoy

Can you clarify Omegatoy.....is that a raw carrot or a cooked one  :-/

well the boys td gets hot enough to cook it!!!!

True....

[Taxi_Driver]

Just my 2 penny worth....viscous fans are crap.....you said in an earlier post that you could hear the fan....sounded to me that the fan was on all he time...hence the noise from it....from my experience viscous fans either dont work or are on all the time....

Heres an experiment....if you are feeling brave....or talk Tunnie in to it  

When the engine is hot....viscous fan should be running with some power....so put on gardening gloves...leather ones....or put them on Tunnie   and try to stop the fan.....if you can stop the fan fairly easily....then its fubared!

I was being serious......with thick leather gloves on you wont harm yourself or tunnie....and will prove if the fan is actually being forceful enough

[TheBoy]

Just my 2 penny worth....viscous fans are crap.....you said in an earlier post that you could hear the fan....sounded to me that the fan was on all he time...hence the noise from it....from my experience viscous fans either dont work or are on all the time....

Heres an experiment....if you are feeling brave....or talk Tunnie in to it  

When the engine is hot....viscous fan should be running with some power....so put on gardening gloves...leather ones....or put them on Tunnie   and try to stop the fan.....if you can stop the fan fairly easily....then its fubared!

I was being serious......with thick leather gloves on you wont harm yourself or tunnie....and will prove if the fan is actually being forceful enough

Both Mrs TheBoy and I think the carrot is the safer option....

[Kevin Wood]

Whats your view on my viscous? Donald D'd?

I don't think you'd get the symptoms you are with a bad viscous fan. Once the car is moving you should have plenty of airflow through the radiator to cool the engine. Failure of the fan would give you overheating in traffic only. With the electric fans running there'd be no issue at all.

My Westfield has a radiator from a 1 litre Polo and this cools a tuned 2 litre 16v engine quite happily above an average speed of 30 MPH or so without the fan running.

I reckon you're not getting enough coolant flow for some reason.

However, I take it the bubbles in the expansion tank have been proven not to be exhaust gases?

Kevin

[tunnie]

Just my 2 penny worth....viscous fans are crap.....you said in an earlier post that you could hear the fan....sounded to me that the fan was on all he time...hence the noise from it....from my experience viscous fans either dont work or are on all the time....

Heres an experiment....if you are feeling brave....or talk Tunnie in to it  

When the engine is hot....viscous fan should be running with some power....so put on gardening gloves...leather ones....or put them on Tunnie   and try to stop the fan.....if you can stop the fan fairly easily....then its fubared!

I was being serious......with thick leather gloves on you wont harm yourself or tunnie....and will prove if the fan is actually being forceful enough

Both Mrs TheBoy and I think the carrot is the safer option....

So does mother tunnie!