A/C hissing
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New User
Joined: Feb 2007
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From: North Carolina
A/C hissing
I have a 2006 screw with the 5.4 and I get a hissing type noise from the A/C. It cycles every 7 seconds and sounds like it's coming from the far passenger vent area. It sounds like it's recharging itself or something. I've taken it into the dealer and the first time they said it was the vacuum driven system then the second time they said it was the freon recharging itself. Is every 7 seconds a little to often? It seems to get louder the longer I drive. Needless to say after a four hour trip to the beach hearing this hissing every 7 seconds drives me crazy. It will hiss then stop for seven seconds then hiss again. Anyone??? Thanks.
Junior User
Joined: Dec 2006
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This may not be the case, but I had the same problem with hissing a few months back. Every time I turned on the fan, the hissing got louder. I looked and looked and almost tore apart my dash. Then, I noticed the sound was coming from a bottled coke I had in the cup holder in front of the vent. Yes, I felt dumb. The noise was from a partially opened and partially shaken coke bottle. This probably is not your problem, but I thought it was worth mentioning.
New User
Joined: Jul 2006
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From: S. E. Kansas
Originally Posted by airborne89
I have a 2006 screw with the 5.4 and I get a hissing type noise from the A/C. It cycles every 7 seconds and sounds like it's coming from the far passenger vent area. It sounds like it's recharging itself or something. I've taken it into the dealer and the first time they said it was the vacuum driven system then the second time they said it was the freon recharging itself. Is every 7 seconds a little to often? It seems to get louder the longer I drive. Needless to say after a four hour trip to the beach hearing this hissing every 7 seconds drives me crazy. It will hiss then stop for seven seconds then hiss again. Anyone??? Thanks.
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Senior User
Joined: May 2003
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From: Baton Rouge, LA
My 07 Lariat also makes the intermittent "hissing" noise. I figure it is compressed refrigerant going through an expansion valve, but I do not hear it on my buddies 2004 XLT F-150. Maybe it has something to do with the automatic A/C control system.
New User
Joined: Jul 2006
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From: S. E. Kansas
Originally Posted by obxredneck
I hear it on all my newer ford vehicles so I guess that is just the way that it is, which is fine with me. 
Thanks
Senior User
Joined: Sep 2005
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From: Florida
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
Fleet Mechanic
Joined: Aug 2006
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From: Jacksonville, FL
