Re: S4 heater not working

PeterMcC wrote:
> Ideas?
> 
> S4 - cooling system seems OK, thermostat functioning, fans operating,
can't
> see a problem in that area.
> 
> Heater barely warmer than ambient and I suspect that what little heat
there
> is comes from the warmth under the bonnet rather than from the heater
> matrix.
> 
> I can attach a hose to the heater feed pipe and run clean water out of
the
> heater exit pipe - which indicates that there's no blockage in the heat
> exchanger and that the heater control valve is opening. I can also run
water
> into the heater inlet and thence through the system so that it
eventually
> appears in the expansion tank - which suggests that there aren't any
> blockages on the route through.
> 
> So, as there's nothing wrong with it, why doesn't it work?
> 
> Any suggestions gratefully received.
> 

I would suggest some kind of thermostat issue, but as to what, seems a 
little odd.

Do the heater inlet and outlet pipes get hot at all under normal
operation?

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