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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKV-A5 Golf/Jettas

VW MKV-A5 Golf/Jettas Discussions area for A5/MkV Jetta/Golf (2005/2006 PD and 2009 CR).

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Old August 5th, 2009, 19:20   #1
robrichtx
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Default Delayed Air Conditioning

Weird one here folks - it seems that my AC begins to cool only after the car has run several miles. It's been like this for over a year, and it's really more of an annoyance than anything else. This condition only happens after the car has been sitting for a day or so. The AC works immediately once the car has been warmed up, or if the car has only sat for an hour or two.

Anyone else experience this? My wife's 2006 never seems to have this problem.

Time to recharge the AC? I'm loathe to do that, as it's probably special refrigerant, right

Rob
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Old August 18th, 2009, 13:25   #2
christylea
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I JUST took mine in for this. At first I thought I was losing my mind, but after a hot hot weekend in Dallas shuttling friends from the Midwest around to & from a wedding I decided it was a real issue. I took it in yesterday morning and got a call in the afternoon that they weren't able to replicate the issue or see any codes come back from the scan. I asked them to keep it overnight and try again this morning. Sure enough, I just got a call from the Service department saying that they were able to replicate the issue: pressure-buildup in the a/c compressor. They said they were replacing it.

I know relatively little about the inner workings of automobiles (though I think I'm pretty savvy compared to your typical 27 y/o female). I had looked for this issue here before I took it in and just jumped on to share my findings so someone might benefit since it was so tricky to diagnose. I didn't see this post then but here it is now. Even in Austin! Take it to Hewlett and they should know just what your issue is now. More likely -- you can replace this yourself.

Last edited by christylea; August 18th, 2009 at 13:41.
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Old August 18th, 2009, 17:44   #3
Tim Birney
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Quote:
Originally Posted by robrichtx
Weird one here folks - it seems that my AC begins to cool only after the car has run several miles. It's been like this for over a year, and it's really more of an annoyance than anything else. This condition only happens after the car has been sitting for a day or so. The AC works immediately once the car has been warmed up, or if the car has only sat for an hour or two.

Anyone else experience this? My wife's 2006 never seems to have this problem.

Time to recharge the AC? I'm loathe to do that, as it's probably special refrigerant, right

Rob
Always let the car (U.S./Japanese/German) get to normal operating Temperatures,,,, then turn on the Air.
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Old August 18th, 2009, 21:34   #4
glandpuck
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This problem has been described elsewhere on the forums. people with Climatronic AC systems have been noticing a delay of from 4 to 10 minutes before cooling begins. Also, the AC doesn't seem to get as cold as when the system was functioning properly. The vent air temps should be as low as 36 degrees even in southern heat when the car is freeway driven. A Vag-Com will help if you monitor the HVAC system. Also, it appears that the compressor is not completely pressurizing to the fullest extent, maybe 10 N-M instead of a 17 - 18 N-M. When gauges are put onto the compressor, the low ports read maybe 50 and the high port 175-200 and stays steady. The problem then does not appear to be a leak as even if the system is vacuumed out and R134a re-installed to spec, the same condition exists. Of interest to know, is what brand of compressor was installed on the car: Zexel, Denso or Sanden and what brand was the replacement. Also, if possible, those persons with a VAG-COM should try to monitor the HVAC temps, pressures, amperages, etc. and post to the forum so we can begin to establish what is normal for a Climatronic and how to determine exactly when failure is occurring. Also, if possible, try to retain the replaced compressor so it may be torn down and inspected for design failures or rebuilding in the near future.
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Old August 18th, 2009, 23:37   #5
unsub1
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robrichtx, Hmm, mine takes a minute to kick in but I didn't really question it. Figured the car had to get going or something. I see a theme here; me, you and christylea all live on the surface of the sun, so maybe that's it.
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Old August 19th, 2009, 00:56   #6
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Both of mine have delays, but that is the delay on, of the system..It takes about 1/4 to 1/2 mile before they start pushing some cold air..at about 3 miles, they are both pushing some very cold register air..
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Old August 19th, 2009, 01:11   #7
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Rob/others, are both of your fans running??? I could see a cooling/delayed problem if you aren't moving enough air across the condensor..
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Old August 19th, 2009, 09:55   #8
christylea
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Yah, both fans were running. And the air was always very cold when it did get cold.

Glandpuck, godo info. Unfortunately, my previous compressor is gone. I could probably glean some sort of info from the service receipt about then new one if anyone is curious.
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Old August 19th, 2009, 09:59   #9
DanG144
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Knowledge is power.

Please let us know what they find, compressor data, who made it, model.

I would love to take one apart and see what was wrong (or at least try to see what was wrong.)

I think I know, but I would like to verify.

Anytime the compressor is failed and they put a new one in, try to ask questions that will ensure they do a good and thorough flush on the system.

Otherwise, the compressor will last about as long as the warranty, then fail due to bad oil or metalic particles in it.
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Old August 19th, 2009, 10:02   #10
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I'm having the cooling delay too! This year it got even worse. I think I'm not getting *cold* air at all, just mild instead. I've checked with VCDS (Engine Group 063 block 1) with A/C on and off. In both cases Refrigerant pressure was within specs. Should I woory about it?
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Old August 19th, 2009, 10:13   #11
DanG144
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This seems to be very common with the A5 chassis and the newer compressors.

I would definitely worry about it if I was under warranty, and if my compressor needed replacing, I would try to get a Sanden pump over one of the others.

If the compressor has broken a rod, or has some other mechanical failure that is shedding metal particles, the sooner you flush it and replace it the better. If the only problem is that the electrically operated control valve is failing, then you can run it as long as it is cooling enough to get you by.

The problem is we are not sure of the failure mechanism. Some Zexel compressors are known to be problems. I think Audi has a bulletin out on them.

Another thread on A5 air conditioners. I hope to do more with this before next summer.
http://forums.tdiclub.com/showthread.php?t=253641
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Old August 19th, 2009, 13:33   #12
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1. How do I know what compressor do I have (w/o disassembling everything, of course)
2. are there any diagnostic procedures to diagnose possible A/C compunent failures? (And yes, my BOTH A/C fans are spinning at both slow and high speed; triple-checked that).
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Old August 19th, 2009, 13:53   #13
chemeng1661
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I have the issue as well. On very hot days (like it has been in NJ for the past week), it takes awhile (about a half mile) for the air to blow ice cold.

Also, over the past week, I noticed that the air periodcally starts to blow warmer, especially when at slower speeds (bumper to bumper traffic), then it gets ice cold again. It is really annoying. I haven't observed this before on the car.

I checked the fans twice on my most recent trip home and both were running. I really do not feel like visiting the dealer's service department for this. I have 5100 miles on the car.
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Old August 19th, 2009, 15:17   #14
philip_g
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I do not have the climatronic system and my car is the same way.
At a light there's little to no cooling, once you hit the highway it freezes you out.
Both my fans are running.
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Old August 19th, 2009, 15:28   #15
glandpuck
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Just a thought as I get ready to have some parts replaced: Could it be that the delayed start of the cold air and the air not getting very cold is in fact not a compressor issue at all but an issue with a stuck expansion valve? In my exchanges with DanG144, my reading of the Sanden site and speaking with some purportedly intelligent folks who sell these compressors, I am beginning to think that the compressors are maybe not at fault. First of all, the compressor in an A5, if it is a Sanden, is a PXE variable displacement unit and is in effect one of their most advanced models. That doesn't mean it cannot have design flaws, but it has been designed with many safeguards to prevent mechanical failure. Now in my system, my AC takes a while to come on, as long as up to 8 minutes and then the air temp only goes down to 54 degrees. However, that is still as much as 45 degrees below the ambient air temp and my high pressure port reads 200. So, my compressor is compressing as it should be. I would like to hear from those folks who were told their compressors were broken, but they cooled this much. It just doesn't make sense to me that a broken compressor would work to this degree. Next, I have learned that my low port pressure was 50. According to those who "know", it should be 20. This means the pressure into the evaporator is okay, but out of the evaporator is too high and would explain the air getting cool, but not maximally into the high 30's. As R134a leaves the evaporator, it passes through the expansion valve again enroute to the compressor. This higher pressure transmitted to the evaporator prevents maximal cooling and also might explain the delayed startup as the pressure it too high on the low side.

Also, I am not certain why a system would need to be backflushed and flushed if the problem just requires replacement of the expansion valve and drier cartridge. If in fact there is no mechanical failure of the compressor, where would the metal contaminants come from to ruin the new compressor?

My dealer quoted ~$1300 for compressor, expansion valve and drier replacement. I am going to replace the valve and drier, recharge the system and see if this solves the problem. If it turns out that I really needed a heart transplant (compressor), then I will put that in, but at least I will know for certain what the problem was in the system and might wind up saving a ton of cash.

Any thoughts on my conceptualization of this problem would be appreciated.

Last edited by glandpuck; August 19th, 2009 at 15:31.
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