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distra45 May 14th, 2018 16:41

2010 sportwagen A/C help
I have a 2010 Jetta Sportwagen and the A/C quit a couple weeks ago. I have the the VCDS software and I need some trouble shooting advice. The A/C control valve has just been replaced, but the system will still not come on and blow cold air. I can activate fans with the software, but the pressing the A.C. button does not start the small fan on the passenger side. No fault codes that I can see...or maybe I'm not looking in the right spot. Any troubleshooting help would be appreciated.

cliballe May 14th, 2018 18:50

In VCDS can you go into the Auto HVAC Module, Advanced measuring values and look at a few locations? Check 007 Center Vent Temperature, 008 Compressor Current, 009 Compressor Load, 016 Coolant Fan Activation, 024 Engine Speed, 061 Refrigerant Pressure and post a screenshot of those results.

distra45 May 14th, 2018 21:30

Engine Speed 800/min
Refrigerant pressure-MUX 5.6 bar
Compressor current: specified value 0.820 A
Compressor load 1.6Nm
Coolant fan activation:actual value 9.6%
Coolant fan activation: specified value 0.0%
Center vent temp 29.7C

08-Auto HVAC -- Status: Sporadic communication error 1000

cliballe May 14th, 2018 22:38

Had you just started the car, or did you run it a while before taking those readings? The refrigerant pressure and fan speed isn't adding up for me.

When I had an issue with my RCV the pressures were higher than yours (~12 bar) and the fan still worked too (~50-70%). After the compressor was replaced the refrigerant pressures went up to ~17 bar at idle.

distra45 May 15th, 2018 05:20

It had been running about 10-15 min when I took these readings. The compressor wheel is spinning, but the center bolt and flange are not. The coolant fans turn on with the output tests.

distra45 May 15th, 2018 14:29

Is it time to replace the compressor?

cliballe May 15th, 2018 22:20

So I'm guessing the shear plate feature of the compressor hub was tripped? Are you able to turn the center part of the compressor hub by hand? If not I'd say your compressor has seized internally.

Goatfish May 15th, 2018 22:57

It could just be the shear plate that needs replacing I used this kit on my Delphi unit and it saved me about a grand since VW wanted me to order a brand new compressor . By the sounds of what you described above this may be what you need .

distra45 May 21st, 2018 14:17

I replaced the compressor this weekend and checked for leaks. System held a vacuum so I recharged it. Compressor runs, fans run, cold air is coming out of the vents. Still not sure why the compressor went, but I hope this one last a few years.

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