A/C temperature gradient across vents

[wr6warren]

Just over the last few weeks I’ve realised my A/C is stone cold on the right most vent, then the temperature as you move across the other 3 towards the far left gets warmer and warmer to the point I think there’s no cooling at all most left. I’ve done a good amount of googling with little luck, so any advice would be helpful.

May or may not be relevant - car got a new heater matrix 1+ years ago, not sure if it’s all bled properly as you can sometimes hear gurgling under the dash when the car is switched off (is this involved in the cooling side?), heating seems to be fairly consistent across vents.

Thanks!

 

[wr6warren]

Further investigation - I was incorrect, heating is not consistent.

Set to Lo with AC on, im getting cold to the right and ambient to the left. About 8deg coming from the coldest on the right and 22deg from the left.
Set to Hi, Im getting hot on the left and ambient to the right.

 

[SuperV8]

You have separate AC evaporator and Heater matrix - with blend doors to vary the cold/heat.
You also have blend doors to divert air to either screen, face or feet vents.

They can get stiff/stuck from lack of use.
The link rods can brake & the servo motors can also fail - so hopefully its just a bit stuck!
Try cycling them hot to cold several times - and screen to face to feet several times. This worked on my old Audi - when I noticed the same hot/cold divide issue!

You can also tyre to re-calibrate the flaps:

 

[wr6warren]

Gave all of the above a good go last night, sadly to no success. Found a few workshop manuals that points out where the temp control motors are, and hopefully can get at them from the footwells to see if they are moving correctly, so when I get a few hours Ill have a look. Just seems very strage that one side is doing ambient and hot the the other ambient and cold. Surely both temp control flaps havent broken in opposite ways at the same time.