Hissing sound

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Nov 10, 2012 | 11:52 PM

Flatbed Ed

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Hissing sound

What the hell is that hissing sound I hear all the time? Am I the only one?
I hear it a lot especially at lower speeds. Like a air valve opening and closing.

Nov 11, 2012 | 06:27 AM

2000silverbullet

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From: Gilbert

Got a video of it? Can you tell what part of the truck it's coming from (front/rear/outside cab/inside cab/etc)? Does it do it at idle?

I haven't heard any hissing out of mine, nor have I heard similar reports of this (that I remember).

Nov 11, 2012 | 07:52 AM

Flatbed Ed

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Quote:

Originally Posted by 2000silverbullet

No video. Seems to be coming from outside of cab. Maybe from the exhaust system or motor , not sure. I will start paying more attention to it and advise.

Nov 11, 2012 | 11:02 AM

socapots

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I cant say i have noticed a hiss..

Nov 11, 2012 | 07:12 PM

RZAR

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From: California

The hissing sound I get is from the A/C cycling. You can hear the freon pressurizing and depressurizing at the Evap core inside the truck, probably from the orifice tube.

Nov 12, 2012 | 07:35 PM

Flatbed Ed

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Quote:

Originally Posted by RZAR

The hissing sound I get is from the A/C cycling. You can hear the freon pressurizing and depressurizing at the Evap core inside the truck, probably from the orifice tube.

You may be on to something cause I did not use the AC today and I heard no "hissing". So if it is the AC, is that par for the course, or should I take it to Ford?