Hello every one, 

I hope you can help me resolve my problem.

My AC is more cool on driver side then the passenger side. Difference like 10° from one side to another. 
My mechanic already check the coolant gas and is all good.

I start to disassembling the climate unit hoping the problem was the trap doors o redirect the air flow.

But I see nothing out of the ordinary with the trap door, motors, sensors and heat exchanger from AC. 
Any ideia what looking for? 
 

Best Regards 

 

João Félix

Do you have dual zone climate control?

 

Does the temperature difference occur right away, or does it happen after 30mins or some other time value.

 

What settings are on your climate controls (face, feet, window or auto)

22 minutes ago, varooom said:

Do you have dual zone climate control?

 

Does the temperature difference occur right away, or does it happen after 30mins or some other time value.

 

What settings are on your climate controls (face, feet, window or auto)

It’s single zone. 

Starts right away, wile the driver side gets cooler and cooler (16°) the passenger side never gets that cold (26°) at 30° of ambient temperature.

 

temperature - minimum 

speed - 2/3 

zone - face 

AC - on 

Recirculating - on or off the result is the same 

I think perhaps one of the flaps is stuck in a position or is needing re-calibration.

Sadly I don't now the reset process for manual AC system.

 

Did they scan any fault codes in the car when looking at your AC?

24 minutes ago, varooom said:

I think perhaps one of the flaps is stuck in a position or is needing re-calibration.

Sadly I don't now the reset process for manual AC system.

 

Did they scan any fault codes in the car when looking at your AC?

I think the same, but i check the flaps visually when they are in movement and i don’t see anything wrong. 
 

No, they didn’t check for that 

15 hours ago, jfelix said:

the driver side gets cooler and cooler (16°) the passenger side never gets that cold (26°)

I'm not sure how you're managing to measure that, but on the assumption that your technique uses devices positioned equally relative to the gear selector, it makes me think that you must have a stuck closed vent or blocked cold duct on your passenger side.

2 hours ago, KenONeill said:

I'm not sure how you're managing to measure that, but on the assumption that your technique uses devices positioned equally relative to the gear selector, it makes me think that you must have a stuck closed vent or blocked cold duct on your passenger side.

I measured with a digital thermometer.

Is not a stuck vent, i visually check all of them and seams working fine.

I don’t think ia a clogged vent too, the flow of air is the same as the driver side, so I don’t think is that. Also I was able to inserts a cable gide from the passenger vent to the central vent.
 

Is possible that the AC isn’t make cool enough? The minimum temperature that i as able to measure is around 15°/16°, should it be below 10°? 

On 16/08/2022 at 22:00, jfelix said:

My mechanic already check the coolant gas and is all good.

How good is your mechanic?

 

Did he also plug in a suitable scan tool and do bi-directional active tests?

 

Has the sate of your battery and charging system been checked?

 

 

I've had this on a 2006 Audi A4, albeit with dual zone climate but both set to the same temperature. A re-gass & a new orifice tube (a type of air con filter/valve) sorted it. I used an air-con specialist who did a pressure test, removed any old gas & changed the origice tube then reapplied the correct amount of gas. 

 

At one point I was thinking of regassing air-con myself as it looks easy with one of the kits, but from research I've done this doesn't actually seem the best idea. 

 

This is who I used...they are mobile but based in Hythe, Kent so not sure how far they travel.

 

https://subzerouk.co.uk/

 

 

11 minutes ago, delroy said:

This is who I used...they are mobile but based in Hythe, Kent so not sure how far they travel.

 

https://subzerouk.co.uk/

 

 

 

The OP is based in Portugal !! so I don't think your link would be prepared to travel that far 🤣 

http://www.autojordao.pt/

 

A faulty temperature sensor in the passenger upper vent duct will cause your problem, the system regulates each side individually according to what it is told the duct temperature is, it is probably already seeing the passenger duct as cold.

 

It may well have generated a fault code in the climate control module if the output is implausible.

2 hours ago, J.R. said:

A faulty temperature sensor in the passenger upper vent duct will cause your problem, the system regulates each side individually according to what it is told the duct temperature is, it is probably already seeing the passenger duct as cold.

 

It may well have generated a fault code in the climate control module if the output is implausible.

But that in dual zone right? 
 

in my case is single zone. 

On 18/08/2022 at 00:38, nta16 said:

How good is your mechanic?

 

Did he also plug in a suitable scan tool and do bi-directional active tests?

 

Has the sate of your battery and charging system been checked?

 

 

I trust my mechanic.

 

we connect the device who charges and analyze the AC system and it’s all good.

 

As I can tell the battery and charger are good too. 

On 18/08/2022 at 14:21, delroy said:

I've had this on a 2006 Audi A4, albeit with dual zone climate but both set to the same temperature. A re-gass & a new orifice tube (a type of air con filter/valve) sorted it. I used an air-con specialist who did a pressure test, removed any old gas & changed the origice tube then reapplied the correct amount of gas. 

 

At one point I was thinking of regassing air-con myself as it looks easy with one of the kits, but from research I've done this doesn't actually seem the best idea. 

 

This is who I used...they are mobile but based in Hythe, Kent so not sure how far they travel.

 

https://subzerouk.co.uk/

 

 

Maybe the system is not making enough cooling. 
In the machine the low pressure side reports -5° but in the vents don’t get lower then 16°.

58 minutes ago, jfelix said:

But that in dual zone right? 
 

in my case is single zone. 

Probably not then, my current vehicle does not have Climatronic and does not have the upper vent sensors.

 

Do not trust a so called "intelligent" aircon machine for diagnostics, as far as it is concerned your system is working because the high and low side pressures fall within it's prescribed range, indeed if you have 5° post evaporator temperature in these weather conditions it is but you clearly have a problem.

 

I would have the climate control module scanned for error codes using VCDS or similar then look at measuring blocks and compare all the commanded values of the flaps with the measured values.

3 hours ago, jfelix said:

we connect the device who charges and analyze the AC system and it’s all good.

I was thinking of a scan tool such as full reporting of the whole car and bi-directional operation.

 

3 hours ago, jfelix said:

As I can tell the battery and charger are good too.

Again this could be checked with the right tool.

 

Sometimes a simple thing like lack of of gas but also remember the even simpler things like clean filter and clear ducting and vents.

 

That's me out of ideas so I wish you good luck.