I drive yesterday at rush hour with my A/c on at 19 deg and just saw that A/C part frozen,covered in solid white ice,I'm sorry but was to busy to take a picture.

My climatronic in working normal,cooling is fine,everything is fine

What is wrong?I guess is not normal

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Which part was it exactly, as the image you posted doesn't seem to work.

If the air con is on it is normal.

I think this is normal, I rented a hire car in spain and had the aircon switched on, came to park the car for a couple hours and there was a pool of water underneath the car, I thought I had smashed the radiator but turns out it was from the A/C. I susspect what had happened was what you have described, the pipes froze with ice then in the sun it melted causing the pool of water.

Yep, that's normal.

I've done some research and it seems that I don't have enough cooling gas so the pressure is a bit low ,and freezing pipes appears.

The part indicated will get cold, but shouldn't completely ice up.

If the drier has never been replaced, it may be restricted and acting like a secondary TXV. VW recommend that it is changed every 2 years.

Replace the drier and have the aircon purged/refilled.

Can you indicate me wich particulary is the drier ?

Thanks!

It's the canister under the part which freezes. :yes:

The drier is located roughly below the fluid container (the part arrowed in the picture).

It's a cylinder about 160mm long and 60mm diameter.