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Old 10-05-2014   #1
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Coolant leaking from filler cap....why??

I've recently bought an 04 plate Scudo 2.0 JTD and am having trouble with the coolant system.... When warm, coolant is forced out of the reservoir filler cap - quite a bit in fact, about 1lt for 50 miles of warm running.

I've flushed the system, fitted a water pump etc and a new filler cap, thinking the cap could have been faulty....but no joy the replacement cap was a 6 job from GSF.

Car doesn't overheat - it holds a steady 70deg - and no evidence of coolant in the oil.

I have a theory of what could be causing this, but really hope I'm wrong.....therefore would like any other suggestions to investigate please...
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Old 10-05-2014   #2
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Re: Coolant leaking from filler cap....why??

To add a bit more detail:

Starting from cold: rad hoses nice and soft.
After 5 mins running at tick over: rad hoses still soft
When up to temp: hoses under pressure: not rock solid, but definitely pressured
When up to temp: coolant level in header tank has dropped
When cap opened: (yes I know, not when hot!) level rises again
When cap opened when still a bit warm, lots of pressure in the reservoir...how much is normal?

You can see where I'm going with this - had an XUD engined Citroen in the past that had a hairline crack in one of the swirl chambers....

Haven't done a combustion gas test...are the self test kits reliable?
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Old 10-05-2014   #3
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Re: Coolant leaking from filler cap....why??

cylinder head gasket I would say
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Old 10-05-2014   #4
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Re: Coolant leaking from filler cap....why??

Thermostat ok? does the cabin heater get and stay warm? System bleed correctly?

Start with easy, quick and cheap things first:-)
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Old 10-05-2014   #5
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Re: Coolant leaking from filler cap....why??

Thanks for replies....heater and thermostat are fine. In terms of bleeding okay, how would i tell? Afaik it's normal - reservoir seems to be the highest point so the old trick with the 2lt bottle as a header tank not needed...

If it was HG (as opposed to cracked head) would I not expect to get contaminated oil? Or not always?

I guess I need to get the coolant checked for CO2 and go from there....
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Old 11-05-2014   #6
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Re: Coolant leaking from filler cap....why??

I assume the van runs ok ?
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Old 11-05-2014   #7
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Re: Coolant leaking from filler cap....why??

Yes it runs well, good temp etc. apart from the fact it's leaking coolant all over the block, no other issues!
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Last edited by Scudoria; 11-05-2014 at 11:22.
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