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[midnightmower]

Hi
The pressure test is best way forward. Perhaps you can borrow a small mobile compressor.
My 25XE leaked from the cylinder head gasket above the dis coil pack. I discovered this when replacing the dis for 2nd time in 3 yrs.
Use a mirror on a wand to look around.  You probally will need to remove th plenium to see below it.
Expect to find discoloration and deposits around the coolant bridge but don't jump to conclusions unless there is liquid coolant

[jb]

90% chance it is the HBV - they dont last more that 6 or 7 years

[Thingymabob]

Well, I have located the HBV valve (well hidden I must say) in order to see if I can find any traces of leaking coolant
(still haven't pressure tested the system, things tend to take some time, don't know why... ).
The part of the valve which is visible (the top and the side with two connections) looks dry and shows no signs of leakage.
Which part of the HBV is usually leaking? Is it even possible to see that part of the valve, without removing stuff from the car?