AirCon low pressure side too high.

Ian21401 · Jul 15th, 2022, 19:14

Daughter’s XC70, AWD, D5, my2011.
AirCon has had no maintenance since she acquired the car in 2017.
No AirCon problems until now when it isn’t cooling as much as it has been in the past. ( the ambient temperature in our area of the country is not excessive, only low to mid 20s C)
She took it for a free AirCon check offered by Halfords which revealed that the low pressure side is reading much to high.
I don’t know much about AirCon but having given myself a crash Google and YouTube course it appears that there are a number of reasons for this.
Has anyone had any similar problems and does anyone have any suggestions as to where to start.
She is booking it into a local independent who suggested starting with a leak test and recharge.

monkeh · Jul 16th, 2022, 16:28

1st problem, she took it to Halfords!

NEVER take a car to Halfords or Kwikfit. Find a reputable Air con specialist. Many will even come to you. I've had my truck aircon system serviced at my house for £90, I had to replace the compressor and needed it vac'd, checked and re-gassed. The XC cost me £65 for a service. (I get them done every few years) XC had lost next to no refrigerant.

Tony Rama · Jul 16th, 2022, 18:25

I don't know much about ac but in researching the malfunction of my air-con, I came across something called an expansion valve. It reduces the pressure from high to the low pressure in the evaporator. If this fails or is malfunctioning, presumably the low pressure side will be too high.

sasdiscos · Jul 16th, 2022, 19:56

Too much gas in the system will cause high suction pressure in hot ambient.

That’s about it.

Refrigerant gas is directly related to temperature.

If the system is running and you have high suction pressure this can be the only answer.

Even if there was air in the system it wouldn’t cause high suction pressures. It would affect the high side.

Steve.

Jul 15th, 2022, 19:14	#1
Ian21401 Premier Member Last Online: Feb 11th, 2023 20:32 Join Date: May 2010 Location: Blyth, Northumberland	AirCon low pressure side too high. Daughter’s XC70, AWD, D5, my2011. AirCon has had no maintenance since she acquired the car in 2017. No AirCon problems until now when it isn’t cooling as much as it has been in the past. ( the ambient temperature in our area of the country is not excessive, only low to mid 20s C) She took it for a free AirCon check offered by Halfords which revealed that the low pressure side is reading much to high. I don’t know much about AirCon but having given myself a crash Google and YouTube course it appears that there are a number of reasons for this. Has anyone had any similar problems and does anyone have any suggestions as to where to start. She is booking it into a local independent who suggested starting with a leak test and recharge. __________________ Ian. Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse.

Jul 16th, 2022, 16:28	#2
monkeh Pain in the backside Last Online: Apr 25th, 2024 10:10 Join Date: Mar 2007 Location: Newport	1st problem, she took it to Halfords! NEVER take a car to Halfords or Kwikfit. Find a reputable Air con specialist. Many will even come to you. I've had my truck aircon system serviced at my house for £90, I had to replace the compressor and needed it vac'd, checked and re-gassed. The XC cost me £65 for a service. (I get them done every few years) XC had lost next to no refrigerant. __________________ 'Designed by a computer, built by a robot, and driven by a f***ing nutter' '09 XC70 SE - 2" lift, D5 225bhp, poverty spec.

Jul 16th, 2022, 18:25	#3
Tony Rama Member Last Online: Mar 18th, 2024 08:27 Join Date: Oct 2017 Location: Watford	I don't know much about ac but in researching the malfunction of my air-con, I came across something called an expansion valve. It reduces the pressure from high to the low pressure in the evaporator. If this fails or is malfunctioning, presumably the low pressure side will be too high. __________________ V70 D3 auto MY2011 2.0L 5 pot 163bhp. Eunos Roadster G-Ltd 1.8L

Jul 16th, 2022, 19:56	#4
sasdiscos Junior Member Last Online: Apr 20th, 2024 09:34 Join Date: May 2021 Location: The Middle	Too much gas in the system will cause high suction pressure in hot ambient. That’s about it. Refrigerant gas is directly related to temperature. If the system is running and you have high suction pressure this can be the only answer. Even if there was air in the system it wouldn’t cause high suction pressures. It would affect the high side. Steve.

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