Aircon high pressure sensor removal..

[Rob1]

I changed mine at the weekend and used a 17mm


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[Flyingscotsman]

Pressure switch & crows-foot spanners currently for sale:   

http://www.mk5golfgti.co.uk/forum/index.php/topic,99842.0.html

http://www.mk5golfgti.co.uk/forum/index.php/topic,99914.0.html

[breeze]

Epic thread bump… but I had a go at this earlier and it ended badly.

Loosening the sensor was a bit tighter than I expected and I ended up breaking the hard line. Cue sudden spray of refrigerant. Felt pretty bad as obviously this is not good for the environment.

At the moment I am trying to pin down which line will need to be replaced. Does anybody have a parts diagram that covers it? I’ll be getting a garage to do for sure…

Edited to add, I did notice some AC dye under the sensor and it didn’t look too old. Gut feeling is it had been cross threaded in the past.

[mjmallia]

https://volkswagen.7zap.com/en/rdw/golf+variant+4motion/golf/2005-420/2/260-260042/

[breeze]

Thanks for sharing. It is 1K0820721BK. Not cheap!

For the benefit of others, the AC man I spoke to said that the official procedure to replace the sensor is to drain the system, despite it having its own valve. I think I was unlucky, but I can see why they would say that.

If you are replacing the sensor and not draining, at the very least wear some eye protection/gloves and have some towels handy.

[JoshB]

I tried to do this and noticed the whole pipe was turning, so I just stopped.
Anyone any tips on how to loosen it off safely? Could do with a bit of A/C at the minute!

[breeze]

I tried to do this and noticed the whole pipe was turning, so I just stopped.
Anyone any tips on how to loosen it off safely? Could do with a bit of A/C at the minute!

Is the system pressurised? If so, and the pipe is turning, you really need to empty the system before trying to replace, because the risk of breaking the pipe is so high. These are aluminium I think.

In your situation, I’d probably buy a replacement hose and sensor in anticipation and then get the system drained, replace the hose/sensor and then refill all done by a professional. You can either buy second hand or new. If buying second hand, make sure that the sensor comes off the pipe or has already been removed, otherwise the same thing could happen again.

Buying used hose, new sensor and taking to an AC place is probably most sensible in your situation. If hose is used you will need to buy o-rings, but they are cheap. If you must try yourself (I wouldn’t advise if the sensor is turning the pipe) wear eye protection and gloves.