This is driving me crazy honestly. My car's losing coolant somewhere but there's no puddle under it when parked, no white smoke from the exhaust, no smell of burning coolant, nothing obvious at all. I've had two different garages pressure test it and both said the system held pressure fine but I'm still having to top up the reservoir every couple of weeks. One guy suggested it might be a very slow head gasket issue but then backtracked and said he wasn't sure. I'd rather not just start replacing parts guessing, especially if it could be something like a heater core leak inside the dashboard which would be a massive job. I was looking at workshop websites late last night trying to find somewhere that does proper diagnostic work rather than just guessing and stumbled across caracrepairsharjah.ae which mentions coolant system repair and pressure testing. Has anyone taken a car there with a mystery leak like this? Were they able to actually track it down or did they give up too?