Aircon not working

Truckerlad10 · 06-13-2020, 11:49 AM

So I have an issue with my aircon not working. It is gassed up with around 25psi on the low side. I've checked all 3 fuses and replaced in the glovebox. The auc sensor replaced with a working item. When the snowflake button is pressed you can hear the gas circulating the system in the cooler behind the dash but no cold air out the vents. Also the pipes to the expansion valve on the bulk head don't get cold. Car is a 2007 325i

Andystobbs · 06-13-2020, 02:28 PM

25psi is way too low. Vapour pressure of R134a at UK summer temps is around 5bar. Unless your system runs and you've taken that measurement while drawing on the suction line. If so your high side pressure is more relevant. Sounds low on charge.

gIzzE · 06-30-2020, 04:41 PM

I think it shuts down if it drops below 31psi from memory.

06-13-2020, 11:49 AM	#1
Truckerlad10 New Member 2 Rep 14 Posts Drives: Bmw 325i Join Date: Jun 2020 Location: Shefford iTrader: (0)	Aircon not working So I have an issue with my aircon not working. It is gassed up with around 25psi on the low side. I've checked all 3 fuses and replaced in the glovebox. The auc sensor replaced with a working item. When the snowflake button is pressed you can hear the gas circulating the system in the cooler behind the dash but no cold air out the vents. Also the pipes to the expansion valve on the bulk head don't get cold. Car is a 2007 325i
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06-13-2020, 02:28 PM	#2
Andystobbs Captain 191 Rep 720 Posts Drives: E91 Lci, Vectra B V6 Join Date: Sep 2019 Location: Chester, South Wirral iTrader: (0)	25psi is way too low. Vapour pressure of R134a at UK summer temps is around 5bar. Unless your system runs and you've taken that measurement while drawing on the suction line. If so your high side pressure is more relevant. Sounds low on charge.
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06-30-2020, 04:41 PM	#3
gIzzE Major General 363 Rep 5,984 Posts Drives: F11 + 911 C4 Join Date: Apr 2006 Location: Norfolk, UK. iTrader: (2)	I think it shuts down if it drops below 31psi from memory.
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