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AC controls need coding?

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Old Sep 27th, 2020, 19:22   #1
gimbers
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Last Online: Oct 5th, 2020 14:07
Join Date: Feb 2019
Location: Guildford
Default AC controls need coding?

Hello All,

I'm new here but have an issue with my 2012 V50 diesel air conditioning. Long story:

Summer 2019 was buzzing down the motorway when a mist started to come out of the central vents in the cockpit. I called Volvo assist and they said it was gas from the AC. Sure enough, AC not working.

Summer 2020 took her to my local Volvo dealership and they said their machine refused to gas because of a leak. Wanted to charge me up to £2500 to find the leak/replace the condenser and/or compressor.

I took her to an indy who said that the refrigerant smells, so the mist that came out of my vents was something else - just a coincidence. They successfully re-gassed her. They weren't sure what pressure to do it to, apparently the notice telling them what pressure to use was not present on my car, so re-gassed her a further three times at different pressures. They said they could get the AC to work using a computer, but the controls in the cockpit were not operating the AC. But it was working, but only from a computer. Also said the Volvo dealerships machine must have been faulty. Also said that the controls are coded to the system and only Volvo can do that. Charged me £45.

I have re-approached my Volvo dealership with all of this info and they do not seem to agree that the controls have to be coded. They are very vague, but not sure what to do.

If anyone has any pointers for me I would be most grateful.

Many thanks in advance,
timbers
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Old Sep 27th, 2020, 22:16   #2
FracturedButWhole
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Last Online: Jan 23rd, 2024 17:19
Join Date: Feb 2018
Location: Carshalton
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Hi there,
I'm sure controls are not coded, as I tried different modules in my car and it worked perfectly each time.
Secondly - aircon will work when turned on by diagnostic computer, always. That's the nature of diagnostic. However, it should only be used for a really short time, to avoid compressor damage. It is used mostly to check if compressor clutch engages properly, in essence electrical bits.
When I had problem with my aircon, it turned out that I had no coolant in the system. It just escaped over the years, so pressure switch was not engaging. Once vacuumed and refilled, it started working. Compressor is a bit noisy, but that's the whole different story...
I hope it helps a bit. Cheers.
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