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From: Knobdoodle on 25 Nov 2009 06:31
"Clocky" <notgonn(a)happen.com> wrote:
> Actually, that makes me think. There would probably be a thermal
> protection device on the compressor and is likely incorporated into the
> clutch coil and more likely to go open circuit then the coil windings. We
> will probably be replacing some shortly, I'll investigate further...
>
That sounds like rumour I heard. Ta. very much.
Knob


From: Clocky on 28 Nov 2009 00:00

"Knobdoodle" <knobdoodle(a)hotmail.com> wrote in message
news:pA8Pm.57449$ze1.18357(a)news-server.bigpond.net.au...
> "Clocky" <notgonn(a)happen.com> wrote:
>> Actually, that makes me think. There would probably be a thermal
>> protection device on the compressor and is likely incorporated into the
>> clutch coil and more likely to go open circuit then the coil windings. We
>> will probably be replacing some shortly, I'll investigate further...
>>
> That sounds like rumour I heard. Ta. very much.
> Knob
>

As luck would have it I have a spare that I kept for my Astra, well the
compressor is iffy but the clutch works perfectly so I'll endevour to
disassemble and inspect next week and I'll post my findings here.




From: Knobdoodle on 28 Nov 2009 02:17
Clocky wrote:

> As luck would have it I have a spare that I kept for my Astra, well the
> compressor is iffy but the clutch works perfectly so I'll endevour to
> disassemble and inspect next week and I'll post my findings here.
>
Thanks but I found it on the interweb and had a go at it today.
It's got a 187� thermal fuse on the inside (compressor side) of the coil
that had blown.
It's a turd of a thing to get at but I replaced it with a 228� one that was
4 times the size but I've sort-of squeezed in.
I ran out of light (and I was sick of the ant-bites) so the reassembly
happens tomorrow.
Fingers crossed!
(The fix is here
<http://www.motorsm.com/complaints/update/display.asp?aid=3521> )

--
Knob.


From: John_H on 28 Nov 2009 16:31
Clocky wrote:
>"Clocky" <notgonn(a)happen.com> wrote in message
>news:031bd7df$0$1273$c3e8da3(a)news.astraweb.com...
>> "Knobdoodle" <knobdoodle(a)hotmail.com> wrote in message
>> news:iqQOm.57205$ze1.34029(a)news-server.bigpond.net.au...
>>> Anyone know the fix for the Astra air-con problem? I hear it's quite
>>> common (and people are generally charged a motza) but there's a cheap
>>> diode/thermister/miscellaneous-semiconductor replacement that'll fix the
>>> problem.
>>
>> It's the clutch coil that fails, and whilst it can be replaced reasonably
>> easily in situ, they are expensive to buy as a spare part if they are
>> still available.
>
>Actually, that makes me think. There would probably be a thermal protection
>device on the compressor and is likely incorporated into the clutch coil and
>more likely to go open circuit then the coil windings. We will probably be
>replacing some shortly, I'll investigate further...

The purpose of a thermal fuse is to shut down the compressor when it
fails (ie overheats from mechanical friction) and before it seizes.
Thermal fuses tend be very reliable and seldom go bad. Is there any
reason to suspect an exception?

If there is a reason to suspect otherwise the logical fix might be to
bridge it out rather than replace the coil... provided you're prepared
to risk walking home if the compressor does happen to seize (or else
carry a spare belt). :)

The fact that neither Jayair nor OEX list the clutch coil in their
catalogues, but both have a replacement compressor, also suggests that
the compressor is what fails and the fuse probably only does what it's
supposed to.

--
John H
From: Clocky on 28 Nov 2009 19:54

"John_H" <john4721(a)inbox.com> wrote in message
news:po23h51ea1l05g008lpjpo6f4i56ogjihp(a)4ax.com...
> Clocky wrote:
>>"Clocky" <notgonn(a)happen.com> wrote in message
>>news:031bd7df$0$1273$c3e8da3(a)news.astraweb.com...
>>> "Knobdoodle" <knobdoodle(a)hotmail.com> wrote in message
>>> news:iqQOm.57205$ze1.34029(a)news-server.bigpond.net.au...
>>>> Anyone know the fix for the Astra air-con problem? I hear it's quite
>>>> common (and people are generally charged a motza) but there's a cheap
>>>> diode/thermister/miscellaneous-semiconductor replacement that'll fix
>>>> the
>>>> problem.
>>>
>>> It's the clutch coil that fails, and whilst it can be replaced
>>> reasonably
>>> easily in situ, they are expensive to buy as a spare part if they are
>>> still available.
>>
>>Actually, that makes me think. There would probably be a thermal
>>protection
>>device on the compressor and is likely incorporated into the clutch coil
>>and
>>more likely to go open circuit then the coil windings. We will probably be
>>replacing some shortly, I'll investigate further...
>
> The purpose of a thermal fuse is to shut down the compressor when it
> fails (ie overheats from mechanical friction) and before it seizes.
> Thermal fuses tend be very reliable and seldom go bad. Is there any
> reason to suspect an exception?
>
> If there is a reason to suspect otherwise the logical fix might be to
> bridge it out rather than replace the coil... provided you're prepared
> to risk walking home if the compressor does happen to seize (or else
> carry a spare belt). :)
>
> The fact that neither Jayair nor OEX list the clutch coil in their
> catalogues, but both have a replacement compressor, also suggests that
> the compressor is what fails and the fuse probably only does what it's
> supposed to.
>

No, it's a common problem John. The coil goes open circuit, much like they
did on VN/VP Commodore because the thermal devices would fail likely due to
thermal cycling or because they're not made to tolerate the Australian
summer conditions.

They used to list the coil, but it was almost just expensive to remove,
repair and refit the compressor as it was to replace it because the part was
expensive and the extra labour involved had to be factored in. On top of
that, if the compressor did fail for whatever reason after the repair most
customers wouldn't believe that it wasn't related to the original clutch
fault and would expect a free repair.





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