Air con woes

[pugville]

Noticed my air con wasn't blowing cold air on one of the "hotish" days we had, did the usual search on here and have since ticked the following off the list. 1. Gas levels are fine so I haven't got a leak. 2. The econ button can be switched on and off so am I right in saying I don't have an electrical fault??? Next on my hit list are the G65 pressure valve & the dreaded compresser. The G65 I got a replacement from GSF but its not the same so its going back today, main dealer price of €67.50+23%vat. Im just wondering if this is wasted as it might be the compressor. On my compresser I cannot hear the click that some other posters wrote about in other posts but when it was being checked for gas pressure when the engine was revved the pressure gauge showed a rise in pressure. My thinking is that this shows the gas is being compressed?? The car is a 2002 A6 Avant engine code AVF. Look forward to any ideas you guys have.

[Col]

You need a decent air-con bloke to look at it with pressure gauges.

Get him to measure the pressure on both sides with the engine off and running.

How did you conclude it was ok on gas?

[pugville]

You need a decent air-con bloke to look at it with pressure gauges.

Get him to measure the pressure on both sides with the engine off and running.

How did you conclude it was ok on gas?


Hi BigCol, tks for the reply.
A local garage had equipment for topping up air con gas. It's not the full system just a refill unit wit a pressure gauge attached.

on a different note I fitted the new sensor today but it didn't change anything so hopefully audi will take it back.
ive also noticed that the pipe beside the pollen filter is ice cold when the air on is on and normal temp when aircon is not on but no cold air in the car at all. Does this mean the compressor is ok?
think I'll take your advice and call out a aircon specialist to give it the once over.

[Col]

Sounds like you might have a fault on the temperature air flap motor in the heater then.

Get it scanned for faults and get whoever does it to observe the flap angle in measuring blocks.

[Peter D]

Yep, failed flap motor. Regards Peter

[pugville]

Can I scan it on vdcs lite with the eBay lead??
also if it is the flap thingy what's the location and does it mean a new part or is it just a clean and re fit?
tks guys

[pugville]

Bit of an update.
Removed the glove box and checked the 4 flap motors visible. All are moving ok when the button in question is pressed.
Are there any more/hidden flap motors??

tried doing a scan myself with the eBay lead but cannot do a full scan I have to do each section separately and I don't know what section to search in

also I can hear the cold air kind of whistling wherever its trapped when the aircon is switched on.
it was 20deg here today so to be close to fixing but can't quite get there is so frustrating:aargh4::zx11:

[Peter D]

There are only four flap motors. Have you checked the temperature of the refrigerant pipes at the bulkhead. Regards Peter

[pugville]

Hi Peter
ive checked the pipes at the plenum chamber where the smaller pipe is ice cold. From inside the car there's some sort of grey insulation material on them so its hard to check. Might scrape a bit off and see

[Col]

Don't do that, you'll get condensation and drippage from it if you do.

Get the flap angles measured, whilst the hot/cold motor might be moving it might not be operating over its fulll range of movement.

Also, measure the evaporator temp whilst it is hooked up.

It is the only way to confirm assuming the refrigerant side is ok.

[pugville]

Yes thought it might cause a problem.
Ill see can I find a fault on my eBay lead

[Peter D]

Assuming you have dual side A/C then do both the passenger and drivers side perform the same. Start the engine from cold and select max cooling. If it initially cools but warms up with the coolant temp gauge then two flap motor are not postioning correct and the cooled air is being reheated as all the air is going through the coolant heat exchanger. Fully A/C diagnostics will show this up as BigCol has stated. Regards Peter

[pugville]

Hi Peter, Im sitting in the car at the moment fiddling with this issue!! Im trying to do a scan on vcds but im not really up to speed with it. im presuming 08-HVAC is to do with the aircon but when selected it finds the vag no. etc etc but then give a warning to many communication errors to continue. Am I looking at a main dealer visit? Also tried what you suggested but even from a cold engine im still not getting aircon cold air just ambient temp air. This cars runs great but ive had a few niggley probs that ive gotton to the bottom of with the help of you guys but im scratching my head with this one!!! Tks again

[mrnice]

I had same probs with hvac controller. I had to 'change latency of port' fir the cable in horrible microsoft windows.
If you google that or check on vcds site you should find a guide on how to do this.
Scan worked for me afterwards.
good luck!

[pugville]

Ok Ths to mrnice Ive gotton my lead to give me a reading at last!! here are the faults shown, and help or advice is as always appreciated VCDS-Lite Version: Release 1.0
Monday, 06 May 2013, 17:45:28:0
Control Module Part Number: 4B0 820 043 AJ
Component and/or Version: A6-Klimavollautomat 0105
Software Coding: 00104
Work Shop Code: WSC 02325
4 Faults Found:
00727 - Potentiometer in Positioning Motor for Defrost Flap (G135)
30-10 - Open or Short to Plus - Intermittent
00601 - Shareware Version. To Decode all DTCs
30-10 - Please Register/Activate - Intermittent
00819 - Shareware Version. To Decode all DTCs
30-10 - Please Register/Activate - Intermittent
01592 - Air Quality Sensor (G238)
57-10 - Electric Circuit Failure - Intermittent

[mrnice]

Glad you got somewhere, I think with codes that say 'shareware version/activate' etc you can just search for code on vcds site for explainations btw

[pugville]

Ive booked a slot with the aircon doctor tomorrow.. Ill post my results, hopfully successful and inexpensive!!

[Col]

I think you are wasting your money as you say the feed pipe gets freezing cold.

The issue sounds like it is on one of the flap motors.

As I've said, get it properly scanned and get the flap angles measured whilst it is plugged in. Most aircon people will not have a clue about this side of the system, you might be lucky though.

[pugville]

Hi BigCol
i haven't disregarded your sound advice but the guy coming to check it for me is doing a vcds scan also. I let him know the faults I found on my scan and he recons it's a failed motor also. He also has motors with him if needed. Fingers crossed, warm weather and leather seats don't mix well.
tks again

[pugville]

Great News... NOT Had a full aircon check today scanned etc, all working apart from air quality sensor but my compressor is GOOSED. Looking at pics of some previous aircon posts its the ZEXEL compressor, rang around a few breakers but no luck yet, the all have denso compressors but no Zexel. Bummer, hope it rains :(

[Peter D]

So you have a freezing cold inlet pipe yet your compressor is goosed and you have an error "00727 - Potentiometer in Positioning Motor for Defrost Flap (G135)
30-10 - Open or Short to Plus - Intermittent"
Which would actually cause your problem. I am at a loss where you are going with this.

Regards Peter

[pugville]

So you have a freezing cold inlet pipe yet your compressor is goosed and you have an error "00727 - Potentiometer in Positioning Motor for Defrost Flap (G135)
30-10 - Open or Short to Plus - Intermittent"
Which would actually cause your problem. I am at a loss where you are going with this.

Regards Peter

Im with you on this one Peter thought I would be driving home today in an ice cold car!!
Aircon tech checked pressures and system showed no difference in pressure with aircon turned on or off. Seemly this shows there is an issue with the compressor??
id love to say he's wrong but he came well regarded from 2 local garages.
Dont know where to go next, either shell out for a used compressor or see can I find somebody else to take a look.
If you have any further ideas on a possible fix I'd be glad to hear them
Damien

[pugville]

Ok the plot thickens
today before the aircon guy called I had replace the climate control unit in the cabin as mine was quiet worn and didn't have heated seat controls for my new seats.
checked the aircon pipe going into the car tonight and it wasn't cold!!!
re fitted the old unit and its back frosty cold again, so aircon tech checking car again on Friday as aircon didn't turn on or off at all today when he worked on it..
lesson learned 1 job at a time Damien :Blush2::Blush2::Blush2::banghead:

[pugville]

wahoo cold car again!!!
car was low on gas due to failed aircon fan on the rad. Pressure got to high and gas escaped I'm guessing. Now just need a new fan and I'm back running cold 100%
Next project is to fit this new climate control module so I have switches for my heated seats, I believe it has to be coded to the car but somebody took the sticker off the top of it with the relevant numbers......
here are pics of new and old

20536
20537
Slightly different new one has an off button and is from a 2001 a6 ake
old one is tattered but now works good :)

[Phutters]

Slightly different new one has an off button and is from a 2001 a6 ake
old one is tattered but now works good :)I don't wish to be unkind, but you might think about having a manicure before you start using the new one ;)

[pugville]

I don't wish to be unkind, but you might think about having a manicure before you start using the new one ;)
Lol, was the previous owner. Only have it a couple of months. New radio needed too!!!