Air conditioning problem 2013 Audi A4

[Bobrun]

Hi, can anyone help me with a problem I have with my air conditioning, when I start a journey my air conditioning works perfectly and for as long as the journey lasts, no matter the time or distance. As soon as I stop and then restart the engine the air conditioning blows warm, if I keep switching the air conditioning on and off it will eventually restart, sometimes quite quickly and sometimes it takes a long time, when it does come back on it works perfectly. Any advice would be greatly appreciated.

[Sid2020]

When your aircon is on and blowing warm check the pulley to see if the clutch is engaging, other common culprit could be a tired solenoid on the pump, these can be replaced separately on many models 

[Bobrun]

Hi thanks for your reply, I will google how to replace the solenoid and check if the clutch is engaging.

[Sid2020]

With the aircon turned on the aircon pulley has a centre section of the pulley that is controlled by a electronic clutch, it will operate for 20-30 seconds then disengage for 20-30 seconds, you will here a click when the clutch kicks in

[Bobrun]

Hi, thanks for your advice, I don’t think it’s the clutch, I’m going to get the solenoid checked out, I’ll post and let you know the results.

[Sid2020]

The clutch’s are pretty reliable 

[Sid2020]

When was the last time you got it recharged, you might be right on the limit of ac pressure sensor shutting down the system, remember the system turns from liquid into Gas and back again so a change in pressure is inevitable 

[Bobrun]

It’s a while since it was recharged, I’ll get that checked as well, thanks again for all your advice, it’s most appreciated.