New car 840 CI

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F31 Aircon issue

Hi Ted
Then I would suspect a loom problem if the signal is sent and assuming the sensors are OK then there is a reason the signal isn't arriving. So my logical old brain would start testing continuity checking all plugs and connectors cleaning them with contact spray I would also check the clutch air gap just to be safe if the garage that checked the compressors and clutches tested them by applying 12v to the terminals but in the car only 5v is applied ?? Do you know what Voltage should be applied to your cars compressor or do they? A quick look at the parts list in ISTA for a 2012 F31 tells me there were 2 types of Compressor 1 uses a magnetic clutch 64529216467 - RP A/C compressor the other with a Magnetic coupling p64506805025 - A/C compressor if I understand it these are replacement parts so require the correct Clutch or Magnetic coupling to be moved over So is the part correct for your car ?
If you can't check yourself then you may need a good Auto Electrician or AirCon Specialist
Dave

By Greydog · 3 hours ago3 hr
F31 Aircon issue

Afternoon Dave,

Thanks for the message. The original garage tested various compressors and ones that they knew were working from other cars. They also tested different dashboards from working cars and the clutch still did not engage. From what I understand the control module is sending the signal for it to start but for whatever reason it does not kick the compressor on.

By tedjohnstone · 5 hours ago5 hr
F31 Aircon issue

Hi Ted
Just the weather to have aircon issues 😅 You say anew compressor was fitted but did they fit a compressor complete with clutch mechanism or did the clutch get transferred to the new compressor ? Has the loom to the compressor been tested for continuity they may seem dumb questions but all to often it's the dumb stuff that catches us out. Ask if the clutch airgap was checked and what it measured?
I have seen 3 compressors with sticking clutches 2 of them just needed the air gap adjusting (to large and the clutch won't activate) to have them operating and 1 just needed a squirt with WD40 I am not an AC guru but I have fixed enough of the simple things. Check the airgap you can do it with feeler gauges should normally be between 0.3mm and 0.8mm the gap can be adjusted with shims check the internet for Vids and how too's
Hope this helps
Dave

By Greydog · 6 hours ago6 hr
F31 Aircon issue

The system has been pressure tested multiple times and there are no leaks.

By tedjohnstone · 10 hours ago10 hr
F31 Aircon issue

I wonder has anyone actually checked the A/C gas pressure and/or the pressure sensor/switch as if this is below range then quite possibly the compressor would not run to avoid damage.
I would be tempted to take it to an air conditioning specialist for further checks, physical rather than electronic

By BOC Administrator · 11 hours ago11 hr

New car 840 CI

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F31 Aircon issue

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F31 Aircon issue

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F31 Aircon issue

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