The rest of the system has a constant flow of coolant. The heater only gets
flow if the valve is open. If it is seldom opened, it can become clogged (as
you know).
So, yeah, there is probably some muck, but it is unlikely anything is
actually blocked (or you'd know about it).
I have flushed systems with water from the hose (after draining the coolant,
of course). You can buy an inexpensive flush-and-fill kit that includes a
fitting that splices into a heater hose, that has the garden hose thread.
You have to remove the thermostat and replace the housing in order to get a
thorough flush. You also have to leave a drain open, possibly the radiator
stopcock.
on 3/7/09 11:03 PM, Simon Matthews at simon.d.matthews@gmail.com wrote:
> On investigating why my MGA heater was not functioning, I discovered
> that the heater control valve was completely full of scale. I do mean
> completely.
>
> This made me wonder what the rest of the cooling system might be like.
> Does anyone have any recommendations? Don't worry about it? Flush with
> something? If so, what?
>
> Regards,
> Simon
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
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