Heater Matrix - direction please ...

[pieterm]

Firstly a BIG thank you to all those members who helped this Rover 'newby'. Following refilling instructions 'to the letter', I no longer lose water but I do still have a small issue with the heater. After flushing out the cooling system, I slowly refilled taking over an hour. The system took almost exactly 7.5 litres of coolant. Disconnecting the heater pipe connection near the battery, I noted blowing one end caused fluid to come out the other. As water seems to flow in and out of the matrix quite freely, I thought all was good. But this is where I need some direction, please. The heater is luke warm. Rear, left and right vents all work OK and the temperature is constant at all outlets ... but it is luke warm and only once the thermostat kicks in. NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD- cold until then Although water/coolants move freely through the matrix, and without any apparent restriction, I would have thought the matrix to be OK BUT, I do note the heater pipe that passes near the battery is significantly cooler than the other heater pipe. This has me quite confused as it seems to defy logic. Why would the two pipes vary so much in temperature when water/coolant moves so freely through the matrix? To my expert friends out there, does this still sound like a matrix replacement to you? As usual I bow graciously to the higher powers amongst you