Aircon not working - 2.0D

[Ducatimatrix]

Originally Posted by Clan

The "pressostat" is a low pressure switch which cuts the compressor out when the gas pressure is so low as to no longer be able to carry the lubricant around for the compressor , the pressure is not stated but likely be just a few Bar, it may be stamped on the switch .

The 4 pin sensor is a variable output pressure sensor which reports back the actual pressure for operational purposes . It will shut off the compressor at 30 Bar if the system is overworking for whatever reason ..

Pressure reading is no indication of volume of gas left however .

you need to change the "pressostat" switch if you think it is faulty , see how it is , and if the performance is low get it checked for leaks and if ok then refilled with the correct volume of gas .

You can change the "pressostat" switch without draining the gas , you will just get a small puff as you undo the switch , it then seals .

Thanks for the update on the switches and pressure. I will change the switch and see if a leakage test will be needed.

Thanks again

[Surfingbird]

I have the same issue here, does anyone know what the pressure in the system needs to be at, at lets say 20°C? I cannot find any data at this whatsoever.

[Notts Ian]

You may find this a useful guide to pressures.

http://ricksfreeautorepairadvice.com...c-with-gauges/

I also have non-functioning A/C. Condenser and dryer on my shopping list.

HTH

Ian.

[Clan]

Originally Posted by Surfingbird

I have the same issue here, does anyone know what the pressure in the system needs to be at, at lets say 20°C? I cannot find any data at this whatsoever.

the pressure in a static system varies quite a lot from -10C to + 35 C also pressure is no indication of volume of gas left in the system , unless it is near empty of course.

[Surfingbird]

Originally Posted by Notts Ian

You may find this a useful guide to pressures.

http://ricksfreeautorepairadvice.com...c-with-gauges/

I also have non-functioning A/C. Condenser and dryer on my shopping list.

HTH

Ian.

I see. Interesting! I do however have no possibility of using AC gauges, as this is not legal for normal people in Denmark. Here we need education to get permission to do this.

[Clan]

Originally Posted by Surfingbird

I see. Interesting! I do however have no possibility of using AC gauges, as this is not legal for normal people in Denmark. Here we need education to get permission to do this.

This is the same in the UK you have to be certified with City & Guilds or IMI qualifications , there are hefty fines up to £40,000 for tampering with AC systems and/or letting gas escape into the atmosphere . It is cheap enough to let the professionals do the work .

[Surfingbird]

Originally Posted by Clan

This is the same in the UK you have to be certified with City & Guilds or IMI qualifications , there are hefty fines up to £40,000 for tampering with AC systems and/or letting gas escape into the atmosphere . It is cheap enough to let the professionals do the work .

Yep, that sounds about the same. Only in the US i guess, that everybody can tamper with stuff they don't know about

[Welton]

I have a document here about the Climate Control, it states:

Pressostat:

The pressure sensor signal is used by the ECM. If pressure drops below approximately 1.65-1.90 bar, the compressor shuts down and is activated again when the pressure rises to approximately 2.95-3.25 bar.

To me this would indicate a minimum required system pressure of around 3.0 bar and it also talks about an absolute maximum of 35 bar! so there's a large range of pressures going on.

[phil1968]

Originally Posted by Clan

This is the same in the UK you have to be certified with City & Guilds or IMI qualifications , there are hefty fines up to £40,000 for tampering with AC systems and/or letting gas escape into the atmosphere . It is cheap enough to let the professionals do the work .

F-Gas, it's the refrigeration / air conditioning equivalent of the Corgi (now Gas Safe) registration for gas fitters. But yes, it's taken as a City & Guilds qualification.