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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004.

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AC switching on/off

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Old Nov 24th, 2021, 12:48   #1
Junior Member

Last Online: Nov 24th, 2021 12:48
Join Date: Sep 2018
Location: Heers
Default 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 ?
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Old Nov 24th, 2021, 13:14   #2
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Last Online: Nov 26th, 2021 21:44
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
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Old Nov 25th, 2021, 18:08   #3
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Last Online: Yesterday 00:31
Join Date: Jan 2012
Location: batley

Have you got any of the heater/direction controls set to 'auto' by any chance ?
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Old Nov 26th, 2021, 18:40   #4
volvo again
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Last Online: Yesterday 20:42
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Location: Presteigne, mid Wales

Sounds like the compressor clutch needs re-shimming...
1998 V70 2.5 Auto & Supercharged Mercedes C Class...
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