AC switching on/off

loelly · Nov 24th, 2021, 11:48

Hi all,
V40 19 DI 2002

My car AC does strange things. The AC switch on the control panel changes from on (green led) to off (red led) without touching .At some moment like 10 times a min. Later on it stays on for a period and then starts the chrismas tree again.
For me there is no logic in it.It is pure random .Any idea ?

cheshired5 · Nov 24th, 2021, 12:14

See if the ac compressor clutch plate is cycling in and out at the same time.
If so, that's normally low gas.

zoidberg · Nov 25th, 2021, 17:08

Have you got any of the heater/direction controls set to 'auto' by any chance ?

volvo again · Nov 26th, 2021, 17:40

Sounds like the compressor clutch needs re-shimming...

https://volvoforums.com/forum/volvo-...shimming-6665/

loelly · Nov 28th, 2021, 18:49

Yes the controls always stay on AUTO. Only by defrost I turn to Front windows.I let it be 24°c winter or summer.

zoidberg · Nov 29th, 2021, 16:27

Mine switches on and off for a few seconds at a time if set to auto, try setting it to something else.

Nov 24th, 2021, 11:48	#1
loelly Junior Member Last Online: Apr 12th, 2024 12:12 Join Date: Sep 2018 Location: Heers	AC switching on/off Hi all, V40 19 DI 2002 My car AC does strange things. The AC switch on the control panel changes from on (green led) to off (red led) without touching .At some moment like 10 times a min. Later on it stays on for a period and then starts the chrismas tree again. For me there is no logic in it.It is pure random .Any idea ?

Nov 24th, 2021, 12:14	#2
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	See if the ac compressor clutch plate is cycling in and out at the same time. If so, that's normally low gas. __________________ 2002 S60 SE D5 Manual 209000 miles

Nov 26th, 2021, 17:40	#4
volvo again Master Member Last Online: Today 10:46 Join Date: Jun 2018 Location: Presteigne, mid Wales	Sounds like the compressor clutch needs re-shimming... https://volvoforums.com/forum/volvo-...shimming-6665/ __________________ 1998 V70 2.5 Auto & Supercharged Mercedes C Class...

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Nov 25th, 2021, 17:08	#3
zoidberg Master Member Last Online: Jul 28th, 2023 17:19 Join Date: Jan 2012 Location: batley	Have you got any of the heater/direction controls set to 'auto' by any chance ?

Nov 28th, 2021, 18:49	#5
loelly Junior Member Last Online: Apr 12th, 2024 12:12 Join Date: Sep 2018 Location: Heers	Yes the controls always stay on AUTO. Only by defrost I turn to Front windows.I let it be 24°c winter or summer.

Nov 29th, 2021, 16:27	#6
zoidberg Master Member Last Online: Jul 28th, 2023 17:19 Join Date: Jan 2012 Location: batley	Mine switches on and off for a few seconds at a time if set to auto, try setting it to something else.

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