Hello Kelvin,
When i switch on the aircon it got the hissing sound..
even when driving / cruising, i can still hear a hissing sound machiam like leak gas...
My air con will not cold after driving for 30 mins in traffic jam or slow moving and if i step my accelerator hard, the aircon will become cold .. but after some time if i step a little accelerator it will become not cold again...
Just wondering what could be the problem before i go down to let u fix.. need to know what is wrong and budget..

are u open tomorrow? let me know what suspect could be wrong..