Diagnotisic code query
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Diagnotisic code query
My air conditioning stopped working - I got the following dignostic trouble code (see FAQ) - on board diagnostics 22.5 = A/C refrigerant high pressure switch, static open - can anyone explain what this means (I am a novice) - also what is the '88.8' display. I also have an intermittent hot starting problems - I have seen posts suggesting replacing the engine coolant temperature sensor. Are these problems linked? Looking for cheap fix before have to take it to a shop Thanks<ul><li><a href="https://forums.audiworld.com/a4/msgs/2299775.phtml">https://forums.audiworld.com/a4/msgs/2299775.phtml</a</li></ul>
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AC Answer
The 22.5 error means that your high-side AC switch is open... which is indicative of pressure exceeding the maximum allowed by the system.The cheapest way to start is to replace the high-side switch, which costs a few dollars (I think it's $3.00). You then must get about 1/2 way in to a timing belt repair, in terms of removing the bumper and dissecting the front end of your car. This does not require you to open the AC system because the high-side switch is fitted over a tire-like valve, so the system remains sealed with the switch out. This will probably not fix your problem. Not great for a novice.
The next thing to do is to replace the restrictor. This is best left to a mechanic, as it requires evacuating your system, opening it, and finding/removing the restrictor, which is just a glorified coffee filter, fitted into an AC tube. This may fix the problem. At this point, your system must be flashed (with Nitrogen) and refilled with refrigerant. If this doesn't fix your problem, it's the compressor, which you can get for around $200 from discountac.com. Replacing your compressor will require all the previous work (except the high side pressure switch replacement), and it is recommended that you also replace the $20 part (I think it's the condenser, but I can't remember off the top of my head) that keeps the refrigerant relatively clean.
That's an AC service in a nutshell. It's not cheap (I think for my car, the refrigerant cost was going to be about $250).
Good luck. This is a job best left to someone with a thorough knowledge of your AC system.
The next thing to do is to replace the restrictor. This is best left to a mechanic, as it requires evacuating your system, opening it, and finding/removing the restrictor, which is just a glorified coffee filter, fitted into an AC tube. This may fix the problem. At this point, your system must be flashed (with Nitrogen) and refilled with refrigerant. If this doesn't fix your problem, it's the compressor, which you can get for around $200 from discountac.com. Replacing your compressor will require all the previous work (except the high side pressure switch replacement), and it is recommended that you also replace the $20 part (I think it's the condenser, but I can't remember off the top of my head) that keeps the refrigerant relatively clean.
That's an AC service in a nutshell. It's not cheap (I think for my car, the refrigerant cost was going to be about $250).
Good luck. This is a job best left to someone with a thorough knowledge of your AC system.
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About VAG-COM
The VAG-COM is not a "smart" diagnostic tool. All it is is a scanner that has the ability to change certain memory addresses on various modules. The VAG-COM will give you the information fed to it by the car's sensors, and may add some interpretation via label files. It's not a cure-all, and it's not magic. I mention those things because that's the impression you get from reading about VAG-COM on this forum. That being said, you can diagnose the AC system using a combination of the Bentley service/repair manual and a VAG-COM, and I do believe that the car's system is capable of reporting more granular information than what you got from the CC head. Good luck, as always!
Audiworld Junior Member
Joined: Dec 2009
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From: Solvang
Old thread I know....but
I know this is an old thread, but I have the same 22.5 code from my Climate control. No cold air blowing, just had the AC refilled as I knew it was low anyway.
This switch, referenced in post 1, I just bought this HERE
But after thinking about it, that is probably not the switch in question is it?
If so great, if not, a link to what I supposedly need would be much appreciated. Starting the timing belt job Friday after work so I will be able to access what I need to anyway.
Thanks!
This switch, referenced in post 1, I just bought this HERE
But after thinking about it, that is probably not the switch in question is it?
If so great, if not, a link to what I supposedly need would be much appreciated. Starting the timing belt job Friday after work so I will be able to access what I need to anyway.
Thanks!
Audiworld Junior Member
Joined: Dec 2009
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From: Solvang
Alrighty, was easy. Just needed an AC High Pressure safety switch. Some places just list an AC Switch..and its the low pressure one they sell...$30 lost but no big deal. Found it easier to pull bumper and replace than to remove headlight (because it was already off for the timing belt job ;-) )
AudiWorld Senior Member
Joined: Sep 2003
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From: N.E. Ohio
just a quick note to add for anyone with A/C issues, if your outside temp does not work your A/C also will not work. my Outside temp display would go nuts start out at close to normal temp and slowly drop to like -27, A/C didn't work, when I replaced the outside temp sensor everything worked again. I don't think this problem is related to your issue but thought it worth mentioning for anyone looking for A/C issues
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