have a 1.7 DTi astra estate 2004 model thats losing water but can find where it going to. there is no water in the oil and also no oil in the water either was thinking it may be some kind of leak but surely it would show up as a crystaline deposit around hoses etc because there is plenty of antifreeze in there. Also thinking it may be evaporating of somewhere but have no idea as all hoses seem fine and the header tank cap seems fine too.
Also should mention that engine looks like its running cold but i think it is either the thermostat or the temp sensor that goes to the dash. Sits around 60 under normal driving but if in traffic or ticking over for long period it makes its way back to where it should normally be.
Had this problem before and replaced the thermostat and that sorted it so that what makes me think it may be this again but if it is thast means i only got 20 to 25 thou out of the new thermostat i put in. Get my parts trade at vauxhall cos im a taxi driver and was thining of getting a thermostat there for around 20 quid as it may be more reliable than the quinten hazel on i put in or maybe it was faulty to start with. Also exploring that the temp sensor is sending the wrong temp to the dash.
Any ideas on these problems would be appreciated folks.