brian , quick test for you , as you have an infra red thermometer just scan it across the rad to make sure its not blocked again, my gussy rad had been rebuilt by serk marsdon however after a good run a load of corrosion had loosened up and circulated blocking the rad again, if alls ok whip the stat out and try it , hope you sort it soon james
Thanks James,
I did try it while she was running but it's a bit dangerous with the series ! mechanical fan, but I wasn't sure how relevant it would be to try it with the engine not running, I think there's probably a good case for taking the thermostat out and give it a bit of a vigorous back flushing, do you reckon a jet washer stuffed down the heater hose would be chancing my arm
Brian