[bazza68uk]

Hi i have a A5 convertible and when i press the ac button the light comes on and then goes straight off any ideas ??

 

[TJ001]

Sounds like you need a regas.

Find a local aircon specialist and get them to check your gas levels and see if you just need a topup or you have a leak.

 

[Alan__H]

I had the exact same problem a few weeks ago with the switch not staying lit. I bought Genuine VW AG Air Conditioning Pressure Sensor 4H0959126B VW, Audi, Skoda, Seat for £25 but turns out it only needed a regas. I would do as TJ001 suggests and take to aircon specialist to check levels (Not Halfords - they told me it was a leak as there was no detectable gas in the system). If you do need the sensor I have an unused one...

 

[SimonRoma]

You dont mention your car's age, but I agree with these guys that all of our cars lose some gas over time so a regas is always your first stop. Replace the cabin filter too and spray some cleaner fluid thro the system at the same time, makes it smell great!!!

 

[Mart838]

Hiya, my switch stayed lit but the air wasn't cold.
Changed the pressure switch and all working as it should.

 

[Tuttifruity]

Hi guys, I’m having the same problem, how do I change the pressure switch? I’ve spent enough money at garages since buying this car, I’ll have a go myself

 

[Mart838]

Hi guys, I’m having the same problem, how do I change the pressure switch? I’ve spent enough money at garages since buying this car, I’ll have a go myself

It's really easy, remove the slam panel cover 4 torx screws, remove the plug off the pressure switch then a 24mm deep socket to undo the switch.
You may get a small amount of gas coming out but it's on a Schrader type valve so will only be a little.
Refit and connect.

 

[Tuttifruity]

Brill, I’ll sort it this week. Thanks for the info