As title, my superb in blowing cold on the passenger side...also there is a slight whirring noise from the centre matrix when the fan is on...Any ideas?? 

Assuming you have climatronic (the full auto system), try a servo end-stop relearn.  This process runs each air control servo to the ends to learn where they are.

 

Hold down the AC and face-level vent button.  The lights will flash alternately and all the vent flap servos will move and learn their end-stops.  When the lights stop flashing, the process is complete.

This video demonstrates it: 

 

 

Failing that, you'll need a scan with VAS or VCDS.  I've previously had servo wiring fail (for the recirculate control, not the servo you're talking about) and got a message as below so VCDS might show you a failed servo or wiring:

9472881 - Motor for Fresh Air / Recirculated Air Flap 
          B108B 71 [009] - Actuator stuck
          Confirmed - Tested Since Memory Clear

9472882 - Motor for Fresh Air / Recirculated Air Flap 
          B108B 54 [009] - Missing Calibration / Basic Setting
          Confirmed - Tested Since Memory Clear

9476881 - Position Sensor for Fresh/Recirculated Flap Motor 
          B109B 11 [008] - Short to Ground
          Intermittent - Confirmed - Tested Since Memory Clear

 

I just got mine back from the same issue. New temp sensor, new gate motor and as my fan had been sticking, I got a new one of those too.

(under used car statutory warranty)

Also double check the colour of the coolant, has it gone muddy and poluted with a broken silikat bag  ?

 

 

12 minutes ago, bigjohn said:

Also double check the colour of the coolant, has it gone muddy and poluted with a broken silikat bag  ?

 

 

Hi big John, thanks but it’s not that. The ones with this have silikat written on the bottle. Previously the whole heater was cold and I had the matrix replaced, now just cold on passenger side with clicking and whirring from the module....Will take it to the independent to get checked before winter 🥶 

On 21/10/2020 at 04:36, Rkdee said:

I just got mine back from the same issue. New temp sensor, new gate motor and as my fan had been sticking, I got a new one of those too.

(under used car statutory warranty)

Although under warranty, did you get an indication of price?? 

1 minute ago, Melvi said:

Hi big John, thanks but it’s not that. The ones with this have silikat written on the bottle. Previously the whole heater was cold and I had the matrix replaced, now just cold on passenger side with clicking and whirring from the module....Will take it to the independent to get checked before winter 🥶 

 

Yup just checking - sounds like a servo issue. I think there is a procedure to try a reset?

5 minutes ago, bigjohn said:

 

Yup just checking - sounds like a servo issue. I think there is a procedure to try a reset?

Cheers for the reply though 👍🏻 I’m hoping for a magic fix but feel that I’ll be another few hundred quid for heat 🥴

??

 

 

 

3 hours ago, Melvi said:

Although under warranty, did you get an indication of price?? 

No sorry.

Also just found out my AC compressor may be on the blink too.