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Discussion Starter · #1 ·
Hi, I've used OPCOM on my much loved MK4 to try and get the air con working.

I had it regassed last year and they couldn't work out why it was blowing warm, they checked fuses and said it was fine and decided to quote me £400 for a new condenser so I politely declined and used my windows.

But digging out the OPCOM I've now had a read and there's no fault codes, got this information which looks normal to me:

A/C Coding (Air Conditioning)A/C Detected
A/C Information Switch (Air Conditioning)Active 12V
A/C Load Signal (Air Conditioning)Inactive
A/C Pressure4.40 bar
A/C Request (Air Conditioning)Active 0V

Any ideas why it isn't working? Help much appreciated - thanks :)
 

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These have a bad habit of blowing the thermal fuse in the compressor clutch. Put a bulb or meter across the aircon clutch plug and see if it is getting a feed.
 

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Discussion Starter · #3 ·
Since originally posting this I have:

Fitted brand new condenser and receiver drier
Fitted second hand tested compressor
Had it regassed and it held with no leaks identified

Still blowing warm air...
I pulled the plug out of the sensor and both fans kick in so there's no fault with those.

When I turn on the switch on the dash the compressor only works for about 10 seconds before cutting out - this is a fail safe due to there being no gas in there right?

Can anyone suggest anything I've forgotten to check, cause I'm at a loss as to what to do now
 

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If the system was under pressure, the compressor wouldn't normally start in the first place. If the compressor starts but then cuts out it could be a blockage somewhere causing the system to cut out for over-pressure. Watch the system pressure in Op-Com, see what it does when you first turn the system on before it cuts out.
 

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If the condenser, drier, compressor and clutch are all good as you say I would start investigating inside the car, namely the evaporator and expansion valve.

I would advise you seek assistance from a specialist vehicle ac technician as they will have all the kit and experience to assist you diagnosing your issue. If you are located anywhere near Nottingham I would advise you contact ACDC Air Conditioning as Darryl is a magician when it comes to vehicle ac.
 

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If everything works for you, then why do you need to change something. In extreme cases, you can do a chemical cleaning of the air conditioner and forget about it. If you have any problems again, you will make a complete repair of your air conditioner, it's logical, damn it:) Recently, my air conditioner also stopped working at home, and I thought that I would have to spend a lot of money on repairs. But a friend threw me the current prices for repairs Price for Aircon Service, Chemical Wash, Overhaul & Gas Top Up, and I stopped worrying about my money. It turned out that I just had to do a chemical cleaning of the parts, that's all!
 
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