delzeit
Member
I finally got mine fixed. It took trading for a Honda, but now I have a/c after having a problem for over a year with nobody able to diagnose. Good luck to all who are still fighting this issue.
I also have a 2006 Jetta TDI. A/C cools partially at highway speeds, went to a/c shop and he said he thought it was the smaller of the two fans. Not coming on when a/c turned on.
I pulled the shroud and two fan assembly tonight and the big fan will run great from a 12 volt battery. The small would turn very slowly if I got it started with my hand. Looks like I have a bad fan. Looked all over online for a replacement but most of the listings are for 2005 models. Found a listing for 2006 for ACM brand or Siemens. The ACM is only 150 watts, Siemens is 200w, and I figure I need all of the air movement I can get in sunny Florida. The rub is the best prices I have found on the Siemens are only about $30 better than the dealer and no one can tell me how long it will take to get it here. I guess I am headed to the dealer tomorrow morning and can have it in 2 days.
The money will be worth it, it has been 100 degrees plus for 7 days in a row, and I am sweating my ass off.
Pat
My 2006 TDI AC was acting up similarly. The VW dealer diags showed a bad fan, for which they quoted $587 to replace. I found an OEM replacement on eBay for $85 + $15 shipping and replaced it myself. Not too hard a job. I took the old fan apart and found that one of the armature brushes was simply stuck a little too far away to make contact with the armature. I might have been able to fix it by simply tapping on the bad fan with a hammer.
I don't think the HP sensor will fix it.
With a VCDS you can often see that the HP sensor works properly, but you get the delay.
As an experiment, on a friend's 05.5 Jetta, we added about an ounce of fresh PAG oil to the compressor. It is no longer sticking - but it has only been a month or so.
It might be worth pulling the charge and oil, then refilling it with PAO oil instead of PAG, as an experiment.