Hi,

Looking for thoughts.. I have a 2018 A5 sportback 2.0Tfsi...I've just returned from a 6hr drive to and from Cornwall the car never missed a beat..just aircon issues hoping its not anything more than a re-gas..after 3hrs of driving the blowing slowed down and the sir became warmer, turned the blower up to full and the airflow was very low, then a musty smell, which I presume is the aircon needing to be re-gassed.. small trips during the week no problems with the airflow or temperature but yhen the return trip home and after 3-4hrs the airflow was low and temperature warmed up..could this be a re-gas?, motor?, compressor?

Thanks in advance 

That the air flow reduces suggests an electronic problem. Best to get the system diagnosed.

Any comment on the above Martin. I know you have seen it.

Yes thanks, not what I was hoping to hear..was waiting for any other comments..cars in for it's MOT 11th so good to know that it could be the electronics so I can expect that

Thanks

It may be a control problem or a vent motor fault. A diagnostic scan on a professional machine should identify it.

OK...it was only on the long hot trip to Cornwall that did it, not done it since on small 30 50 min trips, stays cool and power of the blower is as it should be on each setting...do getvthe odd musty smell which I thought was the gas getting low 

A musty stink often indicates residual stagnant water in the condenser, caused by the drain being blocked by dirt or leaves. A dribble of water under the car when parked after driving in humid conditions with aircon tells you the drain is open. If there is no water the drain is blocked.

OK, thanks yes always water under the car after parking 

Edited July 18, 2025Jul 18 by mjclegg23

Once sorted next month, I'll update on what it was

Please do.

Hi Cliffcoggin,

So cars just past mot no advisory,  the garage plugged car in instead of just re-gassing and it came up with a fault on the actuator..which he doesn't deal with but has recommended a ac specialist near by..so atvleast I now know what it is..

Thanks for your input