>> On an old Talbot Alpine I had, the heater control flaps were all vacuum operated via a >> myriad of small pipes and valves. Guess how reliable that was?
Sweet Jesus in a chariot driven sidecar, I had one of those.
In addition to that, the heater matrix had both the input and output pipes at the same end of the matrix's side tanks and it was mounted at a shallow angle with the edge having the pipework uppermost.
No prizes for guessing what effect that little pig's ear has.
The thing was so ruddy difficult to get at (remove seats, remove console, unbolt dash, disconnect heater box, remove and dismantle to access matrix) that I didn't even bother trying to flush it out and just fitted a new one.
I have to say that I never had any problems with the vacuum flappery, just the silted up matrix giving a wide choice of cold, cold, cold or very nearly cold.
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