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[TheBoy]

Haven't had chance (or the weather!) to look at this yet.  However I did open the bonnet after shuffling the cars on driveway, and the steam is coming from around PAS/top rad hose area.

Already changed the top hose, what do you think I should check next?

[Entwood]

Didn't I read somewhere that the bit of plastic the top hose connects to on the radiator is a tad fragile and can break easily, especially if jubilee clips are used and overtightend ??

Might be worth a look ??  

[TheBoy]

Didn't I read somewhere that the bit of plastic the top hose connects to on the radiator is a tad fragile and can break easily, especially if jubilee clips are used and overtightend ??

Might be worth a look ??  

It doesn't appear to be from the rad end of hose, but I'll check again

My worry is the HG has gone, like MaxV6's, and leaking on the exhaust, as the steam was present after just moving the cars about...

[Jimbob]

Radweld  


See what happens

Youve nowt to lose

[Kevin Wood]

Radweld  


See what happens

Youve nowt to lose

<sharp intake of breath>

 

Kevin

[TheBoy]

Radweld  


See what happens

Youve nowt to lose

Want to rule out other possibilities first.  I guess could be stat housing, seeing as it is that area.  Bit scared of doing the stat, never done one on V6, and heard that it can be nasty.

[Kevin Wood]

I would go back to the topic of conversation of about a week ago. Remove the plenum and intake manifold then block / join the TB coolant pipes and  pressurise the system cold to see if you can spot a leak.

Edited to say: I've had coolant leaks where they are much worse when cold than hot in the past. I suspect the rubber hoses / seals swell a bit when hot and become softer so the leak seals a little. Maybe this is why it was obvious when you shuffled the car around. A bit of pressure built up but the coolant wasn't hot enough to seal it again.

Kevin

[Marks DTM Calib]

Yup, thats the thing to do....

[TheBoy]

I would go back to the topic of conversation of about a week ago. Remove the plenum and intake manifold then block / join the TB coolant pipes and  pressurise the system cold to see if you can spot a leak.

Edited to say: I've had coolant leaks where they are much worse when cold than hot in the past. I suspect the rubber hoses / seals swell a bit when hot and become softer so the leak seals a little. Maybe this is why it was obvious when you shuffled the car around. A bit of pressure built up but the coolant wasn't hot enough to seal it again.

Kevin
 

I reckon mines worse when cold.

Methinks I need to steal Marks modified cap to pressurise.  Reckon he'd notice if I replaced it with a normal one

[Kevin Wood]

I would go back to the topic of conversation of about a week ago. Remove the plenum and intake manifold then block / join the TB coolant pipes and  pressurise the system cold to see if you can spot a leak.

Edited to say: I've had coolant leaks where they are much worse when cold than hot in the past. I suspect the rubber hoses / seals swell a bit when hot and become softer so the leak seals a little. Maybe this is why it was obvious when you shuffled the car around. A bit of pressure built up but the coolant wasn't hot enough to seal it again.

Kevin
 

I reckon mines worse when cold.

Methinks I need to steal Marks modified cap to pressurise.  Reckon he'd notice if I replaced it with a normal one

 

Failing that, have you got an airline connector / hose that'll push onto one of the TB coolant hoses / barbs? Block the other one and job's a good'un (obviously watch the pressure, but wind it up gradually to 1bar max.). I suspect you'll notice the leak with much less pressure than that.

Kevin

[TheBoy]

I would go back to the topic of conversation of about a week ago. Remove the plenum and intake manifold then block / join the TB coolant pipes and  pressurise the system cold to see if you can spot a leak.

Edited to say: I've had coolant leaks where they are much worse when cold than hot in the past. I suspect the rubber hoses / seals swell a bit when hot and become softer so the leak seals a little. Maybe this is why it was obvious when you shuffled the car around. A bit of pressure built up but the coolant wasn't hot enough to seal it again.

Kevin
 

I reckon mines worse when cold.

Methinks I need to steal Marks modified cap to pressurise.  Reckon he'd notice if I replaced it with a normal one

 

Failing that, have you got an airline connector / hose that'll push onto one of the TB coolant hoses / barbs? Block the other one and job's a good'un (obviously watch the pressure, but wind it up gradually to 1bar max.). I suspect you'll notice the leak with much less pressure than that.

Kevin

That could be an ideal if I can find a way of sealing it

[Darth Loo-knee]

Haven't had chance (or the weather!) to look at this yet.  However I did open the bonnet after shuffling the cars on driveway, and the steam is coming from around PAS/top rad hose area.

Already changed the top hose, what do you think I should check next?

Does sound to me to be the thermostat housing or transfer pipe TB not hard for a man with your Talent

[Markie]

okay.....That rover hose will be in mail Monday.

MV6 - take the plenum off and all gubbings stat,stat housing etc is not a hard job - biggest issue for me is seperting the pipe and stat housing.

This may show you root cause - and also let you have a look at oil cooler plate.

If it doesnt - well its one thing more ruled out.

[TheBoy]

Tried the pressure test thing (still with plenum on) by trying to plug on TB hose and pressurise other, but can't get a seal.

Have to see about getting some spare caps modified, and leave until then I think.

[alanfp]

I know this sort of thing is frowned upon, but if you've tried all other (cheap) avenues), before replacing the HG, you could try K-seal or 'steel-seal' (just Google "head gasket repair seal"

I haven't tried them, but as the previous poster said - what have you got to lose (£10 -£29) . I do know that Barsleaks worked for me when I had water p***ing out of a radiator once.