Poor airconditioning

[xyz123]

My Passat 1.9TDi 110 51 reg has had poor air conditioning since I bought it last year.

The problem is when the temperature is selected to "lo" or Auto 18 the airflow from the vents is not as cold as my last Passat and the cabin temp does not reduce as quickly.

The air con compressor runs the alloy tubes running into the cabin next to the pollen filter, one cold with condensed water collecting on it and the other is warmer.

I have the dreaded Airflow Flap positioning motor V71 static Faulty code 01274-037 and I have checked visually and the flap never moves from the fresh air position. (Never gets to Recirc)

I have used one or those diy air con chargers but only connected it and the pressure is in the 25 to 45 psi" blue do not add refrigerant band."

Question 1: Should the fan on the drivers side be running in the with auto or lo selected on the climate panel?

Question 2 : Do I need an air con system service. If so any recommendations in the Crewe - Stoke on Trent Area

Question 3 : Will the V71 fault cause this problem, I know if it was in recirculation the the temp would drop quicker, but my issue is the air is just not cold enough to start with.

Regards

Andy

[TimboUK]

Been having problems myself too (http://www.vwaudiforum.co.uk/forum/showthread.php?t=72916)


When you say fan on the drivers side, do you mean the fan on the radiator?

Is your problem that it wont hold the temperature in auto?

Firstly for now forget about vent temperatures, put to "LO" and put your Climatronic into Diagnostic mode (Econ, cold, and fan slower button)

Using red and blue buttons have a look at no 40 (Evaporator Temp) and see what its reading. I get 2c under light cooling to 8c under very heavy cooling)

Then I would look at 23 (Vent Temperature Actual) and see what that reads. If you can get a temperature guage to see if they match that would be great.

Now switch to Number 1 (Cabin Temp) and see if it drops, and if it matches a temperature guage.

When did you last change the pollen filter?

If you can get this info we could start looking for reason.


Not cured mine yet either, still working through it.

[xyz123]

Thanks for the info Timbo will get back with the results.

Drivers side radiator fan is 330kohms .
So that's why it isn't working as it has 13'5 volts connected to it when the engine is running and "lo" selected.

I have checked my wives "W" reg Passat and both pipes next to the pollen filter are very cold not like my one only?

Yes the pollen filter has been replaced.

Andy

[xyz123]

Timbo

Climatronic into Diagnostic mode:

Results
after 10 mins

1= 29

23= 7.5

40= 20.5

I also noted the other results up to number 40.

If there is any more info required?

[TimboUK]

Where you staionary? To be honest, if your fan is not working you will not cool efficiently whilst the car is slow moving or stood still. I would get the fan to work first :Blush:. That maybe all it needs.

Forgot to add, you sure number 40 is correct? I cannot see how you could have a vent temperature as good as 7.5c, whilst your evaporator is at 20c.

[v6tdi]

Hi i have the same issue took mine to the dealer today after having kwik fit regas it, they say there is nothing wrong with the air con components and they think it may be a electrical fault, they want the car for a day to run though the wiring, as far as you fan is concerned mine runs all the time in auto its only off in econ so is my withs golf.
let me know if you have any good replies with this.

Cheers

[xyz123]

Timbo

I was stationary during the test and yes number 40 is correct at 20.5 !

I will replace the aux fan and then run the test again.

I'll get the fan tomorrow and let you know.

Thanks v6tdi for your input.

[xyz123]

I cant get hold a new fan apart from VAG !!
Tried GSF, Eurocar parts no joy?

Any ideas where I can get hold of one?

Andy

[altairfour]

Hello,
My car also has poor air conditioning and shows a V71 fault, although there is no ticking noise.

Does the V71 fault cause the air con to stop working, or is it the case that there is probably something else wrong with the system and the V71 is a red herring?

A bit of history. . .
Recently got the air con re-gassed as kwik fit. It did not get any cooler and they didn't charge me! The garage which serviced the car told me it had a code saying the Air con pressure switch had failed (could be F129). Could not get much more info on this - VW were next to useless. Anyway - plugged in a VAG-COM and reset the code. It now gives a V71 code. Am only using the shareware VAG-COM (409.1) so can only seem to get one code, and can't change the basic settings. Can't just throw money at this one :(

Anyone have any ideas?

Steve

[snapdragon]

Check your part no. on VAGCAT or off the old fan, and I'll check where I got mine from mail order when I get home, these guys sold fans for all models. PM me if I forget. It came the next day and was 1/3rd of price of dealer for same item. (delaer wanted £175)

Have you found the instructions on here of how to replace?
http://www.vwaudiforum.co.uk/forum/showthread.php?t=8549
rob123's post over half way down.

[xyz123]

Thanks for the info snapdragon

I managed to get the fan going by turning it while spraying contact cleaner into the motor, then connecting it to 12v.
However the bearing is very noisy and it's not spinning very quickly!

I've managed to get a price on a new fan of £108 delivered.

If you can find out who you ordered from and let me know.


BTW . That clip at the bottom of the cowl looks fun to get at?

Thanks in advance.

Andy

[snapdragon]

My fan had 4 brushes in it and two were completely worn away and the other two not far behind. The brushes were not practically replaceable as I did spend a lot of effort looking into this.

[snapdragon]

Hi
can you remember where you got the air con fan from?



It was ebay seller:
http://myworld.ebay.co.uk/motorpartsonline/
Motorpartsonline
Tel: 0845 224 2932
Although I just phoned them directly with my credit card over the phone rather than ebay.

Kind regards, Richard

[xyz123]

Can someone check number 43 Refrigerant pressure during the air conditioning check mine is reading zero?

A pressure check shows good pressure!

I take this comes from the 4 pin pressure switch mounted under the bumper below the drivers headlight?

Does anyone know what the pins outs are?

Andy

[TimboUK]

Can someone check number 43 Refrigerant pressure during the air conditioning check mine is reading zero?

A pressure check shows good pressure!

I take this comes from the 4 pin pressure switch mounted under the bumper below the drivers headlight?

Does anyone know what the pins outs are?

Andy


Mine also reads zero (but mine control is not good either, but it does cool ok on LO)

[xyz123]

Thanks Timbo

New fan is fitted but still not kicking in when Lo is selected in Auto or Econ ?

I am going to take it for a re-gas tomorrow to make sure and then may be fit a pressure switch ?

The ac pump clutch clunks when you jump 12 volts to it and the new fan does the same so i think it is either working correctly due to a low pressure or the switch is u/s ? or something else?

Any expert advise out there?

Andy

[Gt_Tdi_rich]

Mine also reads zero (but mine control is not good either, but it does cool ok on LO)
Can u guys tell me which pipe leading into your pollen fillter is cold is it the small one or the bigger one.

[TimboUK]

Going on aircon theory; the small pipe will be the high pressure one (the return from your condensor in from of the radiator), and potentially warmer. The high pressure is then released into your evaporator through a small hole, this release in pressure creates the cold. The warm exterior air then flows through your evaporator and is cooled. The gas returns at a lower pressure through the larger pipe.

It is because of this your 2 pipes will never be FREEZING cold, as the transition takes place in the evaporator.

Hope that makes sense

[Gt_Tdi_rich]

Going on aircon theory; the small pipe will be the high pressure one (the return from your condensor in from of the radiator), and potentially warmer. The high pressure is then released into your evaporator through a small hole, this release in pressure creates the cold. The warm exterior air then flows through your evaporator and is cooled. The gas returns at a lower pressure through the larger pipe.

It is because of this your 2 pipes will never be FREEZING cold, as the transition takes place in the evaporator.

Hope that makes sense
Thanks for the reply
I have ice forming on the thin pipe on mine but it does not get cold inside the car.

[xyz123]

Good news my Climatronic is working again !!!:D

As I mentioned before I replaced the drivers side radiator electric fan which now works.

Tested the air con pressure switch off the car by using an airline and checking with a a multimeter. All tested fine.

Took the car for air con service at a local independent BMW garage, 25 mins later system, vacuumed out leak tested and refilled with 850 grams of R134 gas.

By the way it only had 453 grams in it before.

Started the car and instant difference COLD air !!

Checked to see if the radiator fan was running. Yes it was.

Checked the air con pipes entering the cabin next to the pollen filter and BOTH were very cold.

Went through the diagnostic codes on the Climatronic panel and the :
code 40 Evaporator temp actual is now 8.7 deg c from 23.

So everything is working fine apart from v71 recirc flap which is stuck in the fresh position (blower fan visible with pollen filter removed).

If anyone needs an xls file of the Climatronic fault finding codes pm me.
Its just a chart with several columns to fill in so you can see any changes on subsequent tests.

Also if anyone with a fully serviceable could fill one of these in and send it back to me we could have a useful resource that people could cross refer to.

To cover 1997 to 2001 B5 and 2001 to 2005 B5.5

Please take the time ,it may help others.:1zhelp:

Many thanks to all who have help me sort this problem out.

Andy

[kite]

Looks like we have an Air-Con guru ;) well done :beerchug:

[TimboUK]

Good news my Climatronic is working again !!!:D

As I mentioned before I replaced the drivers side radiator electric fan which now works.

Tested the air con pressure switch off the car by using an airline and checking with a a multimeter. All tested fine.

Took the car for air con service at a local independent BMW garage, 25 mins later system, vacuumed out leak tested and refilled with 850 grams of R134 gas.

By the way it only had 453 grams in it before.

Started the car and instant difference COLD air !!

Checked to see if the radiator fan was running. Yes it was.

Checked the air con pipes entering the cabin next to the pollen filter and BOTH were very cold.

Went through the diagnostic codes on the Climatronic panel and the :
code 40 Evaporator temp actual is now 8.7 deg c from 23.

So everything is working fine apart from v71 recirc flap which is stuck in the fresh position (blower fan visible with pollen filter removed).

If anyone needs an xls file of the Climatronic fault finding codes pm me.
Its just a chart with several columns to fill in so you can see any changes on subsequent tests.

Also if anyone with a fully serviceable could fill one of these in and send it back to me we could have a useful resource that people could cross refer to.

To cover 1997 to 2001 B5 and 2001 to 2005 B5.5

Please take the time ,it may help others.:1zhelp:

Many thanks to all who have help me sort this problem out.

Andy

I have started writing a word document on this. I have only to add the code info now. If you like I can email you it, and we can combine the info.