Sorry i can't help you, but posted to offer my admiration for tackling this job in an era people flinch at swapping a wheel over, and well done for managing without a heater for so long, i had an ex WD Series Landrover full canvas top with no heater at all and no piping for one in one of the coldest winters of my adult life, no not as bad as '63.

Son and i changed the heater matrix on his Seat Toledo (51 plate Diesel), a nightmare of a job, heater rad must have been the first thing they fitted to the bare shell, never again.

Edited by gordonbennet on 21/09/2020 at 18:23

Most cars seem to have the flow going into the bottom connection and the return from the top, so that air doesn't get trapped in the matrix. The flow side will probably come from the water pump - although not always.

If you can pull the hoses off fairly easily, do it with the engine running at 1000 + rpm and the one the water comes out of is the flow.

Thanks for the replies. removing the dash was the worst job i have attempted on the car, hidden fittings and brittle plastic was just a couple of the problems i encountered. the only saviour was that i didn't have to remove the heater box as there was just enough clearance when the box was pulled back and some of the sound deadened cut to lift the matrix out.