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As far as I can tell no coolant loss. I'm presuming I could do a sniffer test myself.. might be worth buying one just to confirm either way. As I say, two different mechanics two different sniffer tests two apparently different results.
Changing cap and thermostat to rule them out wouldn't cost much
Jw89
If I remember bleeding the mk2 system can be a right pain, particularly with he heater core than can have jammed bypass valves etc. If you're lucky, maybe the first mechanic left a giant airlock somewhere. However with those symptoms you'd normally get a sniffer test, and as it sounds like you have and emissions were detected in the coolant.
Thermostat is also an easy change. The normal drill... check coolant is flowing --> change cap --> change thermostat --> bleed coolant system
I'll ask my bro has literally done this dozens of times on various golfs. You're not loosing coolant except the stuff which ejects out expansion tank right?