A/C hissing
Tuned
Joined: Jul 2002
Posts: 292
Likes: 1
From: Houston, Tejas
If you have the EATC then yes it is normal, the computer will control the ac and do a bunch of different thing to control the ac, one thing is to put in on 60 degrees and press the vent button with the max ac/recirculate button, this eliminates the AUTO function, which is the computer controlled function
Senior User
Joined: Aug 2008
Posts: 152
Likes: 0
From: Cypress, TX
Mine does the same thing, took it in the first time for just the hissing noise and they said it was normal. The second time I took it in there was a clicking noise on the passenger side along with the hissing noise which turned out to be the blend door actuator. I have just learned to deal with mine.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
That was eight years ago... check the date on posts...
Fleet Mechanic
Joined: Jan 2007
Posts: 1,294
Likes: 18
Anyway, its the refrigerant flashing back to gas at the orifice in the evaporator - the thing that gets cold behind the dash. As the compressor cycles on and off, you get the hissing on and off. Compressors will cycle more often when they get a little low on refrigerant so on an older vehicle you should have the refrigerant pressures checked once in awhile. In the meanwhile, just turn the radio up. 
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