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I’ve been having the same problem. I have a 2015 N20. However I think I may have located my problem minutes ago.
While replacing the thermostat a few weeks ago I notice some residue built up in and around some of the hoses (one in particular)from the thermostat up to the oil filter area and the hose that returns back from the radiator area, also a bit down around the belt area. I cleaned this off while changing thermostat, then drove for a few days & checked...residue back.
I kept loosing coolant, never any signs of leak, no signs of water in oil, or undercarriage tray...None..except for that built up residue that wasn’t oil, but didn’t know what.- Only happens when ac on btw...but even then I make it about 30 miles and only loose I’d guess 1/8 cup.
My guess is this: my leak is seeping out of the hose(intermittently & under a/c on conditions), hitting the hot block, then evaporating.
I had a P0527 and low coolant happen a while back, finally replaced thermostat last week when wife was away for the holidays. I’m determined to find and fix this leak! I’m tired of no heat/ac on the commute! Hopefully without going to an Indy.
Any others experience this? Is there a cheap pressure tester device of some sort?
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