hunt247

Has anyone experienced this problem? I have a 2007 F-150 Screw, occasionally I hear a strange noise from the front-end. It almost sounds like a vaccum is releasing pressure, sort of a "pissing" sound. It is very noticable especially with the windows down. It's loud and sometimes can last for several seconds, then it stops. It has occurred during any driving conditions. I can't figure out what causes it, it almost seems to be a random event. The dealer has been no help so far.

Any ideas? Thanks in advance.

Schertz7

maybe you ran over a hoover? haha

pecahead

it definately is a vacuum noise. Instead of conventional hubs they use what is called a vacuum actuator (3c247). As well there has been a common problem with the vacuum tube that runs from the regulator on the fender apron down to the actuators (3a785). I work the shop counter for ford and have changed many of both.

hunt247

Thank you very much for your info, I will pass it along to my Ford dealer.

Thanks again

hunt247

Thanks pecahead. I told the dealer what you said and it turns out that was exactly the problem. I just got the truck back, all fixed up. No thanks to their investigation of the problem

Don't you just love doing the job yourself for your dealer. I asked the dealer if I would be getting a discount for my services, they just laughed a bit.

pecahead

Shhhh...don't post that was EXACTLY the problem or everyone will be coming to me for that stuff!
Glad I could help man! Working at a dealership our guys mis-diagnose things all the time and I constantly question why people come back! lol

Hause

That is too funny.

AAK625

If I am running my 04 5.4L and I stand in front of it, I hear a hissing as well. Is that just the AC compressor or am I way off?

pecahead

These trucks have lots of funny noises. I've heard the same thing in my 05 and have used the "ears" to pinpoint it to the a/c compressor.
I can't wait till it gets cold and everyone complains about a wicked whistle happening in the cab at times! I know EXACTLY what that is! lol

Dale

Recently I found that I have a problem with the vaccum that goes to myfront hubs I was just wondering if anyone knew when the 4x4 is on shoud there be vaccum on that line. any help would be greatly appreciated