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Old 04-09-2005
Kyle F's Avatar
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Join Date: Mar 2005
Location: Knoxville, TN
Posts: 37
Truck Starts... Lots of Noise form AC

Well I changed my oil today, and afterward I started it up.. checked the plug and filter for leaks... shut it off and it started hissing. And the A/C pipes were cold, but the AC is not on. What gives?
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Old 04-09-2005
V8 Level II's Avatar
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Join Date: Nov 2004
Location: Michigan
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The AC hisses when shut off as the high and low pressure sides equalize in pressure.

On your 2004, the AC compressor is enabled in the folowing modes:

Floor only
Max AC

The only modes where it is not enabled are

Panel only (vent)
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Old 07-14-2009
Join Date: Nov 2006
Location: Dublin, GA
Posts: 23
Bringing this thread back '98 is hissing while on.
I can tell the compressor is on and then it clicks off and hisses inside (cold air still blowing throughout all of this), then clicks back on, then clicks off and hisses inside, etc.
I had a buddy charge it on sunday, its tuesday and I think I'm already running low on freon again. We sniffed it and couldnt find a leak, so we assumed on sunday it was leaking in the evaporator coil. Any thoughts on this? Thanks
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Old 07-14-2009
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Join Date: Oct 2007
Location: NH
Posts: 191
When i saw the post my first thought was the click clack problem. It is a known issue. There is a TSB on it. I never bothered to fix mine on my 1995 because I read somewhere it is not harmful, just noisy.

Here is a link to the known issue for my year. You can find yours by doing a search.
Automotive Recalls and Technical Service Bulletins for 1995 Ford Truck Ranger 4WD V6-182 3.0L. Provided by ALLDATA

01-21-2 OCT 01 A/C Clutch - Loud Engagement Noise

But they want $$ if you want the info to fix. Someone here may know what to do but Ford seems to have known about the issue and what to do.
You can also check with your dealer, if they will give you the info.

EDIT: Of course the hiss, I don't know. The clutch click clacking might be this, in my totally unprofessional opinion.
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