PeterMcC wrote:
> 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...
>
So, the fault lies in the matrix somewhere. Bit odd that you can get
water from a hose through, though.
> ...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.
>
I would have to guess that when the engine is running, the stat closes.
> 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.
Well, that's a given, but it's best not to talk about it.
>
> 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.
>
LOL.
--
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116 Giulietta 3.0l Sprint 1.7 156 TS 145 2.0 Cloverleaf 156 V6 2.5 S2
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