AC issues

**Shoppinit** · July 7th, 2012, 10:16

300W fan part number is 4B3 959 455D.

You sure it's the fan and not the control unit, though?

**sheatisdale** · July 7th, 2012, 16:49

I just developed a similar problem with my AC. I took a 290 mile trip and it worked just fine all the way here. Went out yesterday to buy gasoline before the prices went up and the AC isn't cooling. All I get is air that is ambient or slightly hotter, and I'm near Columbia, SC...so that is some HOT air.

I have good refrigerant pressure and the compressor definately kicks on when I turn the system on, and kicks off and on when I hit the econ button. Today I drove it for a bit and kept switching from AC to econ and back and varying the temperature. At one point it started cooling the air just a bit, but it went back to ambient or slightly hotter just a minute later.

Any ideas?

Thanks,

Shea

**Chung** · July 7th, 2012, 16:51

I feel for you. My A/C acted up again yesterday. When it gets too hot the A/C will not turn on. Once I was out of the stop and go traffic I ran the car a bit, pulled over at a rest area and turned the car off and on and the A/C worked again.

I am getting intermittent codes for the coolant temp sensor and my second fan control unit. My understanding the control unit for the second fan is built into the fan (probably why it is so spendy)

**Shoppinit** · July 7th, 2012, 16:53

Nope, the smaller 300W fan has a separate control module. The bigger 600W is the one that has it integrated. And that one is megabucks.

**sheatisdale** · July 7th, 2012, 16:55

Sorry to hear about your issue. I put the vagcom on mine and I'm not getting any codes from mine. Maybe the 97-100 degree weather is causing the issue for me too.

**sheatisdale** · July 7th, 2012, 17:20

What should my low-side pressure be at approximately 95-100 degrees outside?

And where is the expansion valve located on our beasts?

Thanks

**Brav** · July 7th, 2012, 18:10

Originally Posted by Shoppinit

300W fan part number is 4B3 959 455D.

You sure it's the fan and not the control unit, though?

I'm not but my mechanic is. He tested voltage from control module. Got voltage appropriate for temp. Fan had bad continuity, so bad coil or something. I would imagine thrthing could be rebuilt for way less than 450...

I had bought a control module so if someone needs one let me know.

**Brav** · July 7th, 2012, 18:18

Originally Posted by sheatisdale

I just developed a similar problem with my AC. I took a 290 mile trip and it worked just fine all the way here. Went out yesterday to buy gasoline before the prices went up and the AC isn't cooling. All I get is air that is ambient or slightly hotter, and I'm near Columbia, SC...so that is some HOT air.

I have good refrigerant pressure and the compressor definately kicks on when I turn the system on, and kicks off and on when I hit the econ button. Today I drove it for a bit and kept switching from AC to econ and back and varying the temperature. At one point it started cooling the air just a bit, but it went back to ambient or slightly hotter just a minute later.

Any ideas?

Thanks,

Shea

Your and Chungs issues are similar to mine. Same codes too. I had coolant control module 2 codes but wasn't the module in my case. If you have problems with warm air, its probably a dying clutch and/or dying fan. My main fan was coming on a lot. GO GET SYSTEM SERVICED before more damage occurs.. my A/C bill is approaching 2k.. make sure they evacuate the system and even flush it. And properly re add oil. Mine had low oil, and decintegrated.

Also you should have no problem getting cold air with this system in 100 degree air.

**Chung** · July 7th, 2012, 18:27

I too am at about 2k. Super annoying that it still doesn't work. I can do the coolant temp sensor myself but not sure about the fan. Maybe I need to enlist in some Mark help

. The second fan rarely runs in my case since the code only comes up once and a while.

**Brav** · July 7th, 2012, 19:51

I bought my module in anticipation of not having to replace it.. but it checks out. I'll send you a PM w info.

**Chung** · July 7th, 2012, 20:22

Just ordered the fan as well. AutohausAZ has it for $220 if you are in need.

**Brav** · July 8th, 2012, 03:13

Originally Posted by Chung

Just ordered the fan as well. AutohausAZ has it for $220 if you are in need.

Perfect thanks!!

**Brav** · July 8th, 2012, 03:24

Originally Posted by Chung

Just ordered the fan as well. AutohausAZ has it for $220 if you are in need.

Actually I can't seem to find it on their site. Not even by part number. Can you post a link? Or did you take the last one..

**Chung** · July 8th, 2012, 17:09

Actually I might had ordered the wrong one. I left off the D at the end.
http://www.autohausaz.com/search/pro...=W0133-1736450,

**Brav** · July 9th, 2012, 18:57

Originally Posted by Chung

Actually I might had ordered the wrong one. I left off the D at the end.
http://www.autohausaz.com/search/pro...=W0133-1736450,

Yea when I search for cooling fan under 03 RS6, nothing comes up..

I would guess this should be something that someone could rebuild in a day? just need bearings and brushes, no?

**Shoppinit** · July 10th, 2012, 09:15

Yeah, it's not rocket science, just a DC motor. Question is whether you can get it apart without destroying everything. These things aren't designed to be serviceable.

**sheatisdale** · July 14th, 2012, 23:36

Well, mine was the compressor. It gave up the ghost. $1800. Ouch.

**Brav** · July 14th, 2012, 23:56

Got the car back today!! Wow, I am so excited to get it, been nearly a month waiting for misc parts. It sucks to be without it, but when you get it back, especially after driving a 79 Trans Am, its glorious.

All in, 2000 bucks for new compressor, dryer, lines, misc parts, new drive shaft, and labor.. not too bad.

Thread: AC issues

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