Catman wrote in
<6r00j.22452$y52.22423@[EMAIL PROTECTED]
>
> 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.
Yes - and, as they're relatively inexpensive and fitted in moments, I'm
only
going to scratch my head for so long before I bung a replacement on to at
least eliminate it from the puzzle.
> Do the heater inlet and outlet pipes get hot at all under normal
> operation?
Once the thermostat's open, the inlet gets hot but not the outlet. All the
observable symptoms tell me that there's no water going through the
heater...
....and, whilst thinking about my reply, I've realised that I haven't
pulled
the heater return off whilst the engine's running with the thermostat open
-
like you do. That would tell me (or I could ask the paramedics later)
whether there's water flowing from the heater whilst the engine's running
-
something that I can't observe when pushing water through it from a hose.
Mind you, having seen the other posts in here today, I realise the most
likely explanation is that MI5 have deliberately broken my heater for
their
own devious purposes.
I'll let you know what happens with the hose pulling - just as soon as
I've
explained to one of the kids exactly what he has to do - and why, despite
appearances, it is completely without risk.
--
PeterMcC
If you feel that any of the above is incorrect,
inappropriate or offensive in any way,
please ignore it and accept my apologies.
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