Hissing sound

[Matt197]

I have just had my cambelt, water pump and aux belt changed + service (inc brake fluid change for some reason) and like always I check things over once I get home and I noticed that once I turned the engine off a constant hissing sound can be heard for around 2 minutes like pressured air escaping.

The sound is coming from the offside front around the aux belt but I cant pin point exactly where, any idea what might have been disturbed?

Obviously I will be taking the car back if I cant locate where its coming from or find something that's been broken, just wondered if anyone has had the same problem and if its a simple fix (save me going back).

 

[Foxspeed]

isn't the evap pipe work and control solenoid in that area? could it be a loose pipe?

(vents petrol fumes back to the engine when starting)

 

[Matt197]

Not sure.

I cant see anything obvious that's not connected but I did run the car with the air con switched off and I didn't hear the hissing sound but when I turned it back on and went for another drive when I turned the engine off I can hear the hissing.

Air con works fine though so not sure where to go from here.