The Dispatch | Expert | Scudo Hub

I have a 2016 Citroen Dispatch 2.0. The blower is blowing air but it's cold air. Temperature gauge needle is getting up to half way on the dial. One garage told me it was the matrix, long story short I took it in to be fixed and they told me that they couldn't get hold of one. They said they had the dash out etc but had to put it back together seeing as they couldn't get a matrix. My Dashcam footage showed otherwise. They started it up and left it running for an hour and gave up.

I've been thinking about connecting a hosepipe to the inlet and outlet of the matrix and giving it a flush. The only problem is I can't reach that far into the engine to uncouple the pipes. If I could reach them I think I'd have to be lay in the engine compartment. One question, how do the connections undo? Is there a knack to it?

Thanks for reading.