Blimey that's unheard of on here, I've seen my heater matrix behind a small access panel as part of the climate control housing/box but I really have no idea how you'd disconnect the pipes, sorry.
I don't know why they don't put the pipe joint in the engine bay where you can access it.
Might be worth checking your cooling system over anyway? excess pressure can show itself on the heater matrix connections of some cars.
Let us know how you get on.
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2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale)
2010 Citroen C4 1.6 HDi (bizarre Gearbox model).
2010 Renault Twingo (refreshingly simple)
2018 Infiniti Q30 1.6T Business Executive (what's this button do?)
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