Hissing sound when any heat/ cold is on

[razor1]

Had anyone popped out the dashboard before? Whenever I put the heating/ or aircon my 2028 model s creates a hiss noise until I turn it off.

I’m assuming it’s a hole somewhere in the piping just behind the dashboard that maybe I could tape up. Probably wishful thinking or maybe it’s a loose bracket I can tighten up maybe (?)

No idea, is it possible to investigate this? Ie look behind the dashboard? Had a search but couldn’t see anything obvious.

Thanks in advance

 

[razor1]

2018 not 2028 haha !

 

[Ande]

Most likely the system is low on refrigeration gas, try to setbcooling to max, the air should be really cold within a minute, I guess it is not...(And you need to refill)

 

[razor1]

Most likely the system is low on refrigeration gas, try to setbcooling to max, the air should be really cold within a minute, I guess it is not...(And you need to refill)

Thanks for your comment, are you saying to set air con to the max for a minute and see if that fixes the hissing? Thanks !!

 

[razor1]

So I tried this (see pic), waited for 4+ minutes using these settings and the air in the car wasn’t cold. It was more like a low temperature setting as opposed to actual air con being on.

Noticed there was no hiss tho when I had this running.

 

[Ande]

Yep, most likely need refill, due to a small leak. Of course, something else could be wrong, but most likely what I wrote.
The sound is there only if the compressor still runs, with barely enough refrigerant.