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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 March 5th, 2009, 20:00   #1
jocat54
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Default 2006 Jetta air conditioner

Our 2006 Jetta TDI air conditioner works when it wants to--cools good when it comes "on". one repair shop says its the compressor--this doesn't make any sense to me, is there a relay or switch somewhere that would or could cause this. Sometimes it starts working after driving 5-6 miles and other times it may not work for 20-30 miles or more.

Thanks,
John
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Old March 5th, 2009, 20:15   #2
DanG144
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Do you have a manual temperature controlled AC, or Climatronic?
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Old March 5th, 2009, 20:17   #3
jocat54
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It is a Climatronic.
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Old March 5th, 2009, 20:32   #4
DanG144
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I need to learn more about climatronic AC.

If the AC tends to run for just a minute or so when you first turn it on, then run intermittently unless at highway speeds, I would suspect your fans. Spray water into your Condensor (with the radiator) does the AC start working as long as this is sprayed with cold water?

Check your fans. Do they run when the AC compressor is on? I THINK they both should run.

Next I would get a set of gauges and a duty cycle meter and verify your charge pressure, and that your charge pressure sensor puts out the correct duty cycle for your AC.
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Old March 5th, 2009, 20:40   #5
jocat54
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It doesn't run when first starting--it doesn't seem to matter if low speed or hwy speed--just starts working when it takes a notion to.
I have checked the charge with gauges and it seems to to be full. Not sure what a duty cycle meter is or the charge pessure sensor.

Thanks,
John
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Old March 6th, 2009, 04:14   #6
DanG144
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Note whether your fans work or not. Put your gauges back on, and note how high the high pressure gets.

Try spraying the condenser/radiator with water.

When the fans do not work, the condenser gets too hot, and this drives discharge pressure up. When the pressure sensor gets too high, it shuts off the compressor.

If you spray it with water, then it will stay cool and work, even without the fans. This lets you know to further troubleshoot and repair/replace the fans.

The pressure sensor also is a high failure item. It can be changed with the charge still in (has a Schrader type valve). It senses pressure and puts out a square wave voltage whose high voltage percentage varies with pressure. The fan control module or the ECU (I do not have your drawings) does the high and low pressure switch functions (fan and AC clutch operation) based on this signal (among others.)

If you take a look at your fan operation, I will do some more research.
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Old March 6th, 2009, 19:57   #7
jocat54
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Thank you, I will check all that--wife has car right now and will be back in a few days.
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Old March 6th, 2009, 23:43   #8
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You might also investigate VW Technical Bulletins re: AC problems, poor AC as there are quite a few of them for the A5 Jettas.
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Old March 7th, 2009, 06:07   #9
1998993C2S
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How can we gain access to the VW TSBs for our A5 TDI cars? I too would like to read through the Climatronic related TSBs.

I always thought of the Climatronic systems operation being "out of sight out of mind" level; very good performance, however the systems present operation is off the mark as the temp control when in A/C mode needs adjustment (lower) often. Hey it's Atlanta, GA and the ambient temps just aren't higher than 65F yet. Just wait ~ 95F will be here soon!
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Old March 8th, 2009, 00:37   #10
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Make sure the cooling fan is running with the AC on..Common problem...
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Old March 9th, 2009, 14:59   #11
1998993C2S
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Default Are the radiator/condenser fans operational?

Quote:
Originally Posted by Mach1
Make sure the cooling fan is running with the AC on..Common problem...
Thanks Mach1 ~ checked their operation and found both fans operate when in A/C mode. At the time, the engine was stone cold and when calling HVAC system for A/C, the fans would operate.
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Old March 9th, 2009, 18:29   #12
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Then I would make sure the compressor is staying on.. May be a low freon or a bad connection for the compressor drive voltage..

Make sure the fins are clear while there(condensor) and that you have a fresh 'new' cab filter..

While troubleshooting the system, its a good time to make sure all is well..check the easy things as well.
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Old March 9th, 2009, 22:06   #13
Luis G
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There is no way to check how full the system is just with gauges. You can how ever tell if there is enough pressure to start the compressor. Could you please post the gauge readings, both hi and low. AC on and off.

The low/high pressure switch went out on mine.

I think if the charge was low then the compressor would cycle on and off. Same is true if the condenser was getting to hot.

If it is low then you have to find the leak, repair, then recharge. The charge limit is very tight, something like 525 + 25grams
(18.5 +.9oz)
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Last edited by Luis G; March 9th, 2009 at 22:43.
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Old March 10th, 2009, 07:24   #14
DanG144
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Default Climatronics self diagnostics

http://pics.tdiclub.com/data/517/Cli...iagnostics.pdf

This may help. I have not had time to study it.
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Old June 3rd, 2009, 11:41   #15
caper7
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I have the same trouble but no climate control
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