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Coolant system over pressurising on long trips

Heathy

Passed Driver's Ed
Location
Hull, East Yorkshire
Car(s)
MK7 VW GTD
Sorry to bring this up again but I’m having the same kind of issue, had it looked at by two garages and both said they can’t find any external leak, I’m not 100% sure where the leak comes from but the coolant tank ends up empty, it seems fine for a few days then out of nowhere the coolant tank just empties it’s self after I let it rest.

I just wondered if the heater matrix definitely fixed the issue but wouldn’t this show up on the tests? I only seem to have heat on the passenger side but it’s been like that a while, is the heater Matrix also easy to change? Can I do it without draining coolant?
 
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