Quote:
Originally Posted by rossocorsa
been pondering this one I'm no convinced that the position of the stat is correct the only bleed would seem to be from the heater circuit which will be closed in warm weather and I am not sure a hole in the stat is good enough perhaps someone more expert (Jules??) can study the diagram?
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The heater matrix is in circuit and open to flow winter or summer, heating set for hot or cold. The temperature of the air is set by air mixing flaps on all cars these days. Only the really old cars had a manually controlled valve under the bonnet to turn the water flow on and off, except I had one Vauxall which had a rather odd system of cabin temperature sensing, mechanically (bulb and mercury filled pipe) feeding back to a flow control valve. I never could get that to work properly.