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[stuart30]

Note.....the engine must be cold to do a pressure test or you want see where the leak is as it will evaporate......

In which case the garage in question couldnt have done a pressure test as requested or if they did they have done it wrong,certainly worth knowing about cold engine.

Regards the water lose id say maybe 7/8 litres over a 20 mile run.

[TheBoy]

Note.....the engine must be cold to do a pressure test or you want see where the leak is as it will evaporate......

In which case the garage in question couldnt have done a pressure test as requested or if they did they have done it wrong,certainly worth knowing about cold engine.

Regards the water lose id say maybe 7/8 litres over a 20 mile run.

the system only holds 9l

[Matchless]

Water loss is very high, seems too high to be headgasket, does it boil and force water out of the filler cap? if not it has to be a split hose somewhere.

I would remove the wiper arms and scuttle to get access to the hoses at the back of the engine, refill the system then start it up and have a good look around.

[philayl]

Have you checked the Heater Bypass Valve, often the cause of sudden coolant loss, and not easy to spot.

[RobC_NE]

just for reference stuart30. the HBV (heater bypass valve) is located behind the engine. will probably have to remove the wiper scuttle to see it. a leak will be signified by staining on the engine and HBV. be warned tho, hbv failure can cause death to the DIS (ignintion) pack if not remedied  :-/

from experience, if the HG has gone i would expect to see some "mayo" in the filler neck and on the dipstick at the least.....