whenever i turn on the AC, i always hear this "hissing" sound coming from the left of the dash

when i turn off the AC, the hiss goes away

i took it to the dealer, the tech told me it's normal since the high pressure air goes through low pressure bla bla bla....so the hose makes some noise


i am just wondering, am i being too sensitive or this is not normal?

thanks

 

I live in the north east I have a 2005 When I use it in the summer most of the time I have the top down so I might not hear the noise. I dont think the car should make any noise I would try another dealer. What year is your car
and did this noisejust start or was it allways there

Buddy

 

02 with 110k miles but serviced regularly . the noise is always there when i turn on the AC

 

I got the same problem. It's most annoying when idling at a stop... it's faint but high-pitched. Wish I could figure out how to fix it...

 

I looked at both your profiles and there is no sc430 listed Is the noise coming from the air conditioning vent in what year sc430 .

Buddy

 

yes. noise coming from the air conditioner vent, in my case, it comes from the left one. i just recent purchsed this car. in fact, only six days ago

 

AC on only or any vent air causes this noise? AC itself will not cause a higher pressure of air to come through the vents. The blower motor causes the air pressure. If your getting noise from the left vent I would look into an air leak there (lined with a little felt from the factory) or perhaps something got sucked into the system and is causing the noise.

 

Mine's a gs430, so lotsa the same parts. And yeah, mine comes from the far left air vent, only when the AC is on.

 

took my car in to the dealer. they said it's probably the air filter....but they are not very very sure....