And on to my next issue
I have the round Smiths Heater in the passenger footwell and although she gets a little warm, she doesn't get hot. The previous owner had a tap installed, so it must have got 'too warm' at some point in the past.
At the weekend I replaced the hoses, removed the tap and flushed the heater matrix in both directions. However she still doesn't seem to get warm.
I have one hose that goes from a 'take off' on the the water pump and into the heater matrix and a second hose that goes from the matrix to the inlet manifold.
When the engine runs, the hose from the heater matrix to manifold gets warm, whereas the hose from the water pump to heater remains cold. Personally I would have thought the opposite - the water should flow from the water pump, to the heater matrix and then back in through the manifold so the hoses should either be the same temperature, or the pump to matrix hose should be slightly warmer.
Both hoses are new. The matrix is clear and water is definitely flowing out of the water pump at pressure when running and the car maintains temperature well.