A quick update and the plot thickens.
I appears to have a problem leaking coolant only when my son borrowed the car for short trips.
It was a warmish day lat week and I turned the heating off. I since lost coolant to within about 2cm of the bottom of header tank with warning message that coolant was low.
Coincidentally my son likes a cool car and when he borrows it he invariably turns the heater down. Invariably the car then looses coolant.
I never see water in the nearside foorwell. There appears no leakage from.the hoses entering the bulkhead.
As mentioned in earlier post I have a new radiator fitted and again no fluid loss under the car.
I do understand that there is a heater matrix on the inside of the bulkhead and pipes pass through the bulkhead to this heater matrix.
When the temp controla are turned to zero, is there a valve which reduces the flow of water through the matrix? If so, I believe it may be this valve which leaks when switching from hot to cold only. When it is either in a fixed hot or cold position it appears to be fine for months. It appears only to leak when transitioning.
Does this make sense, anyone had a similar problem, does such a valve exist and if so, where is it?
Cheers john l
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