A/C compressor starts/stops continously

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Per Groth Ludvigsen - 27 May 2005 22:29 GMT

When the engine is idling my a/c compressor from time to time starts/stops
continously. When I speed
up and let the engine fall down to idle it migth stop the flickering between
start and stop.

In general the aircon seems to work although it has difficulties to cool the
cabin down when idling
for long in traffic jams.

Do I need a recharge?

Thanks and regards
Per

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Peter K L Milnes - 28 May 2005 00:15 GMT

Check your idle speed setting.

Signature

All the best, Peter.

700/900/90 Register Keeper,
Volvo Owners Club (UK).

> When the engine is idling my a/c compressor from time to time starts/stops
> continously. When I speed
[quoted text clipped - 11 lines]
> Thanks and regards
> Per

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James Sweet - 28 May 2005 01:12 GMT

> When the engine is idling my a/c compressor from time to time starts/stops
> continously. When I speed
[quoted text clipped - 9 lines]
> Thanks and regards
> Per

It might be a little low, you could have it checked easily enough. What year
is it? If it's an old R12 system it'll probably be cheaper to convert it to
R134, if it's new enough to be 134 then it's easy to top it off.

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Niels Bengaard - 28 May 2005 08:38 GMT

> When the engine is idling my a/c compressor from time to time starts/stops
> continously. When I speed
[quoted text clipped - 11 lines]
> Thanks and regards
> Per

If it goes on and off within af few seconds you are short of gas.
If it runs for like 30 seconds its normal.

You can get a good idea of how well it cools by measuring the temperature of
the air with the system running at lowest temperature.
You should read around 2 deg C. If its higher that that you are normally
short of gas.

Is it AC og ECC you have?

Niels

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Per Groth Ludvigsen - 28 May 2005 10:06 GMT

It is an ECC system. The A/C compressor start/stop cycle is 1 sec.

Last year the pressostat stopped working and I had it changed. I think I
lost a little gas
through one of the sealings at that time.

Thanks and regards
Per

> > When the engine is idling my a/c compressor from time to time starts/stops
> > continously. When I speed
[quoted text clipped - 23 lines]
>
> Niels

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Michael Pardee - 29 May 2005 07:49 GMT

> It is an ECC system. The A/C compressor start/stop cycle is 1 sec.
>
[quoted text clipped - 4 lines]
> Thanks and regards
> Per

1 sec sounds very much like low charge - more gas should fix you up.

Mike

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Jeff Lesperance - 30 May 2005 04:01 GMT

Probably, but don't overcharge if you can DIY in your country. Too much
does not mean extra cold, it means likely pressure damage somewhere in the
system.

> When the engine is idling my a/c compressor from time to time starts/stops
> continously. When I speed
[quoted text clipped - 11 lines]
> Thanks and regards
> Per

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James Sweet - 30 May 2005 17:38 GMT

> Probably, but don't overcharge if you can DIY in your country. Too much
> does not mean extra cold, it means likely pressure damage somewhere in the
> system.

Not to mention poor cooling. If it's new enough to use R134 he should be
able to charge it himself, but if it's an old R12 system he'll have to take
it in somewhere.

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