OK having taken Derek's advice I jacked the front of the car up high and ran it with the heater valve open. The car got nice and hot so I tried the heater, cold. I let it cool down but noted the two heater hoses were not warm. Removing them reveled no water in the hoses but some in the metal heater radiator pipes. I thought I would be clever and fill up the two hoses but this just caused the water to go down the overflow pipe. I am thinking the heater radiator may be blocked so will try and flush that out before I go any further. Could someone kindly take a picture of the hose layout to the heater for me, they went back as they came off when I changed the head but there is no guarantee they were on right in the first place as the previous French owner was a bit of a bodger when it came to mechanicals I discovered.
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