No Cold Air :(

[TimWills28]

Hi all,

With the heat we've been having, I've recently found out that my air con isn't blowing cold when both dials are set to "LOW".

My econ button light isn't showing but lights up when I switch it on.

I have an audi a3 tdi 140 with the climate zone type of air system.

I've scanned the car and this is the fault code showing.

00483 control module for auxilary air heater sporadic 013

Any ideas?

Hopefully it's just a re gas!

 

[crazyjay91]

Try clearing the fault code and then rescan a couple of days later to see if it's back (or even after testing the climate control afterwards).

Have a look under the bonnet and you should see the air con compressor. The clutch is built in, in the back so you wont be able to see this moving however you should see a bolt in the middle of the pulley. This should be spinning when the engine and AC is on. Check this first. If the bolt isn't spinning, test to see if you have an electrical current flowing to the plug. I think its something like 5v when AC off, and 12v when AC is on but I may be wrong! If you have electrical feed then it could be a faulty compressor I guess!

Also, it could be a faulty hi or low pressure sensor. Or it could just be low on gas, but if it's really low on gas usually the econ button will stay lit and wont turn off.

Hope this helps!

 

[TimWills28]

Try clearing the fault code and then rescan a couple of days later to see if it's back (or even after testing the climate control afterwards).

Have a look under the bonnet and you should see the air con compressor. The clutch is built in, in the back so you wont be able to see this moving however you should see a bolt in the middle of the pulley. This should be spinning when the engine and AC is on. Check this first. If the bolt isn't spinning, test to see if you have an electrical current flowing to the plug. I think its something like 5v when AC off, and 12v when AC is on but I may be wrong! If you have electrical feed then it could be a faulty compressor I guess!

Also, it could be a faulty hi or low pressure sensor. Or it could just be low on gas, but if it's really low on gas usually the econ button will stay lit and wont turn off.

Hope this helps!

I've cleared code and it came back immediately.

Any pictures for the 12v source or where abouts this bolt is I should be looking for?

 

[crazyjay91]

This one is from a petrol but it will show you where I mean...



You should be able to see the nut spinning by putting your head pretty much on the drivers side headlight and shining a light at the pulley on the compressor.. Just please keep your hands away from the belt whilst the engine is running!

 

[TimWills28]

This one is from a petrol but it will show you where I mean...

View attachment 37470

You should be able to see the nut spinning by putting your head pretty much on the drivers side headlight and shining a light at the pulley on the compressor.. Just please keep your hands away from the belt whilst the engine is running!

Many thanks! Made it a whole load easier will have a look in a bit and get a verdict!

 

[JtB]

Thanks for your info Jay. My Air Con isn't working either however I do not have the fault codes like Tim has. The air con just doesn't want to work. Just had the air con re gassed at kwik fit and they said it didn't have any leaks.

The bolt in the diagram you have posted isn't spinning so I checked the electrics which came back with the following:

ECON button on (AC off): around 3V

ECON button off (AC On): around 12V

Is there anything next to try? Or does this mean the compressor is nackered?

Thanks for your help.

 

[TimWills28]

Same findings and numbers I had when I did the check...think a new compressor is needed

 

[JtB]

Same findings and numbers I had when I did the check...think a new compressor is needed

Hi Tim.

Have you purchased and fitted a new compressor yet? If not have you taken a look at this?

http://www.audi-sport.net/xf/index.php?threads/a3-air-conditioning-compressor.155358/

Could be our problem resolved...

 

[TimWills28]

Hi Tim.

Have you purchased and fitted a new compressor yet? If not have you taken a look at this?

http://www.audi-sport.net/xf/index.php?threads/a3-air-conditioning-compressor.155358/

Could be our problem resolved...

If only welding was easily done...

 

[ren32]

Hi all, sorry to revive this thread, but I have an issue with the compressor issue also - How did you resolve yours? I've been informed around £400 for a new compressor! Also, how do you test the volts to the back of the compressor?