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[Elite Pete]

I think someones after catching Tunnies post count. Its difficult to type with no fingers

[JamesV6CDX]

Any further ideas?

You won't thank me for this Jaime.. but....

Get an exhaust sniffer in the header tank.

At least that way you'll have a much better idea it's not a head gasket issue. I know you don't suspect HG, but, it's not unheard of, and exhaust in the coolant will cause over pressurising and bubbles...

At least that way can eliminate it

If it does turn out to be HG, it won't be a fun or quick job (certainly not a day, like the rover!) .. I've never done a HG on a TD.. but I'm pretty confident that between you me and Tunnie, we could have a crack at one  

[Ronald_McBurger]

HG on a TD is not going to be fun. 6 cylinders in line instead of the 3 on the v6. Then, there is the small matter of the weight! Not to mention the timing chains and tensioners.

Give me an auto gearbox change any day.

[Auto Addict]

Just a thought, I don't suppose the front of the rad. is all gunged up, restricting air flow?

[TheBoy]

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

I know the fan is not the cause of the issue, but given the fan's behaviour, do you think its kanckered (in addition to another cooling system fault)?

I have not tested for exhaust gases (except by smelling) in bottle.  I am 99.9% certain it isn't the HG.

[TheBoy]

Any further ideas?

You won't thank me for this Jaime.. but....

Get an exhaust sniffer in the header tank.

At least that way you'll have a much better idea it's not a head gasket issue. I know you don't suspect HG, but, it's not unheard of, and exhaust in the coolant will cause over pressurising and bubbles...

At least that way can eliminate it

If it does turn out to be HG, it won't be a fun or quick job (certainly not a day, like the rover!) .. I've never done a HG on a TD.. but I'm pretty confident that between you me and Tunnie, we could have a crack at one  

Whilst I won't go as far to bet bodily parts, I will say it ain't the HG.  For a moment yesterday, I did wonder, but I am convinced not.  My reasoning:

It runs too well (except for missing a bit on startup, thats a different issue that I know about).

Diesels run at double the compression ratio of petrols, so HG failure allowing cylinder/coolant contamination would result in poor running (remember, diesels rely on compression to ignite fuel), using lots of coolant (only coolant I lose is what it blows out of the top), and diesel fuel/exhaust in coolant (which given the nature of the fuel and exhaust gases I would say would be visible).


My bubbles seem to appear during the bleed stage after refilling, or once/after it is very hot (I suspect the coolant is boiling somewhere).

[TheBoy]

Just a thought, I don't suppose the front of the rad. is all gunged up, restricting air flow?

Well it has 2 fans (that rarely come one) and an A/C condenser in front, which is far from ideal, but thats the design.  I have blown compressed air through it, nothing but dust came out....

[Auto Addict]

Are the bubbles always there?

I seem to remember you said it was OK at certain speeds, then over pressurised at others.

[TheBoy]

Are the bubbles always there?

I seem to remember you said it was OK at certain speeds, then over pressurised at others.

No, bubbles not always there. Only there during bleed stage after refilling, or when it gets hot.

[Auto Addict]

Are the bubbles always there?

I seem to remember you said it was OK at certain speeds, then over pressurised at others.

No, bubbles not always there. Only there during bleed stage after refilling, or when it gets hot.

I would say then, it's not exhaust gases, otherwise they would always be there, don't you think?

[TheBoy]

Are the bubbles always there?

I seem to remember you said it was OK at certain speeds, then over pressurised at others.

No, bubbles not always there. Only there during bleed stage after refilling, or when it gets hot.

I would say then, it's not exhaust gases, otherwise they would always be there, don't you think?

For my experience with tractor HG failure (only one though), is due to the very high CR, it tends to push lots of coolant out the bottle, even with cap off.  Also ran poorly due to that cylinder not firing (needs good compression to ignite), though it was only a 4 cylinder diesel...

[Marks DTM Calib]

When the headgasket goes on a diesel....its spectacular...

As for viscous fan failure....as stated, it should be fine when moving....the one on our 100 quid Senator was goosed and that only showed up in France when I ragged it up a mountain...

Some viscous fans have a tapping through them which allows you to insert a bolt and lock them so they always spin.......

Still think rad though.........

[TheBoy]

Still think rad though.........

I am inclined to agree, just tried to eliminate other possibilities before blowing £230 on a rad, in case that was not the fault...

Apparently, not worth buying 2nd hand ones, as all the TDs sludge up rads, unless you know it came off a good working car....

[Marks DTM Calib]

Get one fom here if your going new....:

https://sslrelay.com/buypartsby.co.uk/radiators_details.php?recordID=2041

There Valeo rads so the same as Vx ones and they have places around Nottingham....

[TheBoy]

Get one fom here if your going new....:

https://sslrelay.com/buypartsby.co.uk/radiators_details.php?recordID=2041

There Valeo rads so the same as Vx ones and they have places around Nottingham....

Thanks!

Tempted to try Ronnie's rad out, if he still has it.  If its better than mine (and it can't be worse!) and improves the situation, then we know its rad.  Or have a punt on the one in the scrappy, which we know a little history behind - depends how much the tight sods want for it though....