Thinking aloud now - I haven't had a chance to do much more tinkering since I refilled 4 litres of coolant, found more wouldn't fit and the vents were still blowing out cold air…
I then came to remove the hoses feeding the heater matrix through the bulkhead, only to find I couldn't access the jubilee clip on the lower hose - 7mm flexi head ratchet spanner since bought, yet to be used.
Could the heater matrix itself be shot, or blocked? I know a common symptom of a bad matrix is coolant pooling in the cabin footwell - which I don't have - but can the matrix still be the culprit? Are they available new?
Is there some pesky fuse I'm overlooking? Haynes says fuse 16 powers the air conditioning (none fitted) and "heater blower" - the blower itself turns over, but no heat comes out.
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