4 hours? Is that a proper dash-out job then? Heater matrix on my old Carlton sprung a leak and the Haynes BOL told me that I had to remove the pedal board, including pissing about with all the associated rods/cables etc., to get to it - I managed by just fully depressing the clutch pedal, and it gave it enough room to slide out. Piece 'o' piss.
What followed wasn't too clever though. To start with I didn't have the patience to properly seal it up at the joint, so I gave up on that and bypassed it until I had a day with more time. Then, the fact that I didn't know how to properly fill a cooling system meant that there was probably an airlock in the system, which in the end resulted in a fubar engine. Still, it had about 230k on the clock and it only stood me in around £200 including getting it MOTd and bits for the MOT, and I got 8000 miles out of it, so not too sad really.
I think my 306d has a leaky heater matrix , I'm intrigued by your post. How on earth did you determine that the head gasget leaking could have caused a problem with the heater matrix ? I mean the whole system is protected from being over pressurised by the cap on the coolant bottle isn't it ? Surely a hose would pop off or burst before metal pipes in a heat exchanger gave way !
I can't think why mine would have failed ( if it has )but I know they do fail.. I though I was just unlucky !
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