Sounds a bit like heater matrix, possibly only leaking when its hot. Hunt around front floor area for any traces of coolant.
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Its a 2000 GT TDI (115 BHP)
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Had the same issue on my MkIV golf. If only showed up when the engine (and water) was warmed up. My garage pressure tested the system when cold so nothing showed up. I eventually found the problem myself, a stone had flicked off the road and embedded itself in the radiator, the damage couldn't be seen until the front bumper was removed. Might be worth checking your garage did the pressue test correctly.
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My 2000 Passat TDI PD115 had a similair problem.
Turned out to be the bottom of the radiator rotted away . The pressure test really showed up the probelm (hot engine) and after that the water poured out.
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Should have mentioned it has recently had a new Radiator put in also... any other thoughts?
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You say the system has been pressure tested- that would indicate a leaking radiator, heater matrix or hose/joint. How much coolant is it losing? Does there seem to be a lot of pressure in the system when you take the expansion tank cap off? If so, this could indicate a failing head gasket. Also check the operation of the thermostat to see if it's opening and closing as it should.
Martin
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