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: 19,760
Likes: 1,079
From: St Louis
That was eight years ago... check the date on posts...
Fleet Mechanic
Joined: Jan 2007
Posts: 1,293
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. 
Thread
Thread Starter
Forum
Replies
Last Post
9902ford
1997 - 2006 Expedition & Navigator
6
Nov 14, 2017 02:52 PM
3weelex
Explorer, Sport Trac, Mountaineer & Aviator
2
May 11, 2017 11:04 AM
thechainsawman
1987 - 1996 F150 & Larger F-Series Trucks
5
Nov 15, 2016 10:46 AM
