Does the hot water flow through the heater matrix all the time, or
only when the dial is turned to hot?
I remember that on my old Bedford van, the temperature dial was
connected to a valve, but there doesn't appear to be a valve on the
new matrix that I've bought. I wanted to try flushing the system out
first before going through the horrendous task of changing the
heater matrix.
I notice that it goes cold immediately when you turn the dial to
cold, which suggests the air is being diverted around the matrix
instead of water flow being shut off.
The rad cleaner I've got in at the moment doesn't seem to be
producing much of a result - I thought it would have worked though
as the air was coming out mildly warm, suggesting a blockage, though
the pipes seem quite hot under the hood where they come out and go
past the engine. I guess there's likely to be a drastic difference
in percieved temperature though, the air isn't going to be scalding
even if the pipes are.
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