Bristol 603
Yes, the heater water valve is on the cabin side of the firewall just above and aft of the Dip switch area. The heater control bowden cable turns an operating wheel to which the valve is connected by a thin rod. In my case the valve was jammed but responded to a little encouragement and now does move but has been incorrectly connected such that the valve is open when the control on the facia is in the cold position! Re-positioning of the cable on the operating wheel would correct this but to get to it is a bit beyond my arthritis so plan is to leave it and see if I get heat without leakage. Removal of the valve will be a nightmare, I cannot see how it is mounted and suspect vent trunking will have to be removed and then? Hope the photos help, I repeat my comments about no thought of maintenance, the previous solution followed by models up to and including the 412 seemed sensible.
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