I finally fixed it! Got some advice form Lens Land Rovers down here in Adelaide, and he suggested to just disconnect the water hoses under the bonnet and give then a good old fashion blow out.....this didn't work, so I connected up the garden hose and flushed the hoses out and it was full of gunk....finally got the water flowing nice and clear - tested the heater after letting the motor warm up and presto the heater works again! Awesome - no cost and nice and warm.....CIAO
