AC Not Working

[inlovewithaudi]

Hello Everyone
AC in my car blows warm air.
Got the follow errors.
Any thoughts?

5 Faults Found
00710 - Defroster Flap Positioning Motor (V107)
41-10 - Blocked or No Voltage - Intermittent
01274 - Air Flow Flap Positioning Motor (V71)
41-10 - Blocked or No Voltage - Intermittent
00604 - Potentiometer Positioning Motor for Air Flow Flap (G113)
30-10 - Open or Short to Plus - Intermittent
00532 - Supply Voltage B+
53-10 - Supply Voltage Too Low - Intermittent
01794 - Control Module - Incorrect Chassis (VIN) Number
35-00 - -

[daihashi]

Hello Everyone
AC in my car blows warm air.
Got the follow errors.
Any thoughts?

5 Faults Found
00710 - Defroster Flap Positioning Motor (V107)
41-10 - Blocked or No Voltage - Intermittent
01274 - Air Flow Flap Positioning Motor (V71)
41-10 - Blocked or No Voltage - Intermittent
00604 - Potentiometer Positioning Motor for Air Flow Flap (G113)
30-10 - Open or Short to Plus - Intermittent
00532 - Supply Voltage B+
53-10 - Supply Voltage Too Low - Intermittent
01794 - Control Module - Incorrect Chassis (VIN) Number
35-00 - -

servo flaps. Probably one that controls the mixing flap by the passenger side kick panel. Clear your codes and see which one comes back, First one to come back is the bad one. The rest tend to just get triggered because of 1 servo.

[inlovewithaudi]

I have tried clearing the codes, but it gives me the same codes over and over again.
Where should I start?

[daihashi]

I have tried clearing the codes, but it gives me the same codes over and over again.
Where should I start?

remove your glove box and see which motors look like they're stuck when you turn on your a/c and adjust your controls. It'll be obvious.

[inlovewithaudi]

Thanks.
The only error that came back is
01274 - Air Flow Flap Positioning Motor (V71)
41-10 - Blocked or No Voltage - Intermittent

[daihashi]

Thanks.
The only error that came back is
01274 - Air Flow Flap Positioning Motor (V71)
41-10 - Blocked or No Voltage - Intermittent

Yep, that's the one I was talking about. Remove your glove box, on the right hand side you will see a servo motor with blue legs attached to it. Next to this motor is a large flap connected to the black box. This is likely the servo that has failed. I'll try to find a picture of this later to show you.

[inlovewithaudi]

Do you happen to have the part number for it?

[inlovewithaudi]

Does this look like the right part?
http://www.ebay.com/itm/130671624127...ht_2056wt_1270

[daihashi]

Does this look like the right part?
http://www.ebay.com/itm/130671624127...ht_2056wt_1270

The one in your pic is the one I was referring too. If you try to adjust the temp/blower then you should see that black flap try to adjust. If not then your servo is probably going out or dead already. If you remove the servo then you can manually adjust the flap until you get your new servo in. Pushing the arms/gears up will put the flap in the full "cool" position.

I am not sure about the part number, but it should be on the servo itself somewhere.

[inlovewithaudi]

now it gave me another code
01809 - Actuating Motor for Temperature Flap; Left (V158)
41-00 - Blocked or No Voltage
01274 - Air Flow Flap Positioning Motor (V71)
41-10 - Blocked or No Voltage - Intermittent

[inlovewithaudi]

I tried manually adjusting the flaps but nothing happens.

[daihashi]

I tried manually adjusting the flaps but nothing happens.

Looks like V71 is the servo with the issue, which should be the blue one that you indicated earlier. You might need to pull the blue lever down instead of up, I forget which way is to channel cold air. Try to throw some manifold gauges on it like I suggested via PM and let me know.

[old guy]

I'm sittin in a hotel room in WV and I have little access to my usual reference documents so forgive me if I can't give details. With that being said I'm pretty sure the servo you are pointing to controls the flow of outside air into the cabin V71 (ie: recirculate button). The servos on the left side control the mix of air through the heater core/AC coils and the direction of the flow (up/down/middle vents). That's where you need to be looking (V158).

[daihashi]

I'm sittin in a hotel room in WV and I have little access to my usual reference documents so forgive me if I can't give details. With that being said I'm pretty sure the servo you are pointing to controls the flow of outside air into the cabin V71 (ie: recirculate button). The servos on the left side control the mix of air through the heater core/AC coils and the direction of the flow (up/down/middle vents). That's where you need to be looking (V158).

Thanks old guy, it's been a while since I've had this problem and couldn't remember which servo I manually adjusted to get cold air.

Inlovewithaudi, If it's on the left side then the V158 servo will be the one with the white wheel attached to it I believe (not certain, like I said it's been a while). I still have my glove box off the car, I'll go outside in a few hours and adjust them all manually so I can help point you in the right direction.

[inlovewithaudi]

thanks guys, I will try again tomorrow morning and report back

[inlovewithaudi]

This http://www.ebay.de/itm/Original-Audi...#ht_1057wt_905
part is not working at all. I removed it and tried manually adjusting the flaps and nothing changes. The heater works great, but the AC.
The ECU was replaced, I am not sure whether the HVAC system needs to be programmed or not. Or maybe it is low on freon.

[daihashi]

This http://www.ebay.de/itm/Original-Audi...#ht_1057wt_905
part is not working at all. I removed it and tried manually adjusting the flaps and nothing changes. The heater works great, but the AC.
The ECU was replaced, I am not sure whether the HVAC system needs to be programmed or not. Or maybe it is low on freon.

HVAC has some electrical components to adjust air mixture inside the cabin, but the cooling actually occurs via the high/low pressure lines, compressor and evaporator; meaning that it's not something that you can recode or adjust with Vagcom. I'm not sure about the climate control unit itself, luckily I've not have to troubleshoot mine.

Where are you located? If you can't get cool air by manually adjusting the various flaps then you really need to get some gauges on the high/low pressure lines to figure out the rest of the story.

when you turn your AC on does the second Fan come on? do you have a vacuum gauge? If so do you get a little vacuum drop when you turn your AC on? (you should see a drop, this mean it is engaged and load is put on the engine).

If you're in Houston or near by then I can help you out with gauges, if not then you'll need to buy some or take it to a shop who can just get the readings for you. I got my gauges from Harbor Freight, I think I paid $49.99 or $54.99 for them at the time. Comes in handy when you live in a stinking hot city like I do.

[old guy]

Suggestion: Turn on the AC and let it run for a few minutes. Open the hood and feel the high pressure line on either side of the restrictor valve. If the temperature is the same on either side you have an AC problem (Low on R134A, bad compressor, clogged restrictor valve). If the low pressure side is noticeably colder than the high pressure side you have an air flow problem with one of the air flow control solenoids.

[inlovewithaudi]

When I turn the AC on, the compressor clutch doesn't engage.
I followed your suggestion oldguy, and both sides are warm. The car has been parked for over 1 year. Is it possible that freon have evaporated?

[inlovewithaudi]

Which side is the low side?

[inlovewithaudi]

Also, it doesn't make a sense to me, both fans are working when I turn the AC on. Does it mean that the ac compressor is actually working?
I thought the fan would not turn on if the compressor is bad

[Charles.waite]

The Drivers side fan is regulated by the engine coolant temperature. the Passenger side fan is regulated by the A/C system status. I believe in any case where the status of a system is unknown (bad temp sensor, etc) the fans default to being on as a safeguard. If the fans are still on when you turn the A/C off (activating ECON mode disengages the compressor) then you've definitely got a fault in the A/C system.

[daihashi]

Get gauges on there otherwise you'll sit there forever "thinking" instead of gathering data that will help you identify what exactly is happening. And yes, that pic you showed is the low side. The gauges can only go on one way because the ports are different sizes.

[inlovewithaudi]

Get gauges on there otherwise you'll sit there forever "thinking" instead of gathering data that will help you identify what exactly is happening. And yes, that pic you showed is the low side. The gauges can only go on one way because the ports are different sizes.

They're on their way
I ordered them on Friday.

[FulhamFTW]

I am having the same problem. No cold air at all. I tried using a DIY recharge kit with no results. The pressure guage just stays in the "green", meaning it is still low. When I run the AC for a few mins, the line furthest from the battery gets super cold and covered in frost. Any ideas?

[old guy]

Lots of good AC info in this thread: Clicky click

[ECS Tuning-Audi]

Which side is the low side?

The line that leads to the thicker hose is the low pressure side.

Since were on the topic of B6 AC has anyone experienced their ECON button sticking or not being able to turn off? IIRC the ECON disengages the compressor which I would assume would keep the AC from getting colder than the outside air. Correct me if I am wrong though.

PS I also heard someone say that there's a safety switch near the drivers side headlight area that needs to be switched or something? I've never personally heard of a manual "switch" just a switch in the compressor that will prevent it from over charging the system.

Jason

[inlovewithaudi]

yeah, I think it is called the high pressure switch
right headlight must be removed in order to replace it

[inlovewithaudi]

So i checked the high and low side and it was indeed low on freon.
I paid $60 to have the system recharged now my AC is ice cold again.
Thanks for all your help!

[Wild_Desimunda]

I am having the same problem. No cold air at all. I tried using a DIY recharge kit with no results. The pressure guage just stays in the "green", meaning it is still low. When I run the AC for a few mins, the line furthest from the battery gets super cold and covered in frost. Any ideas?

I have the same symptoms where farthest line from the battery gets frost on it when the AC has been on for a while, but my car does something funny, Of the 4 vents in the dash, the most left ( driver side) throws cold car ( about 20 degrees Celsius) the middle 2 vents give me roughly 28-30 degree Celsius and far right ( passenger) gives about 25 degree Celsius. The temp settings are set to Low ( 18 degrees or lower) so seems like the left driver side vent is most accurate, I've searched and measured with a Temperate gun...but still nothing

any ideas ?

All help is appreciated, Thank you

[A4Dit]

^ Same problem for me, line under hood gets cold, driver side vent blowing coolish air for a couple of months. Now it blows hot air just like the other vents. With that line getting cold is it safe to say that you're full on freon anf there are no leaks in the system? Does this mean my compressor is good and its a servo, flapper motor or high pressure switch? Any help would be great. It's been in the upper 90's in Florida with high humidity and driving the car without ac is brutal.