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AC Hissing

 
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DanJetta



Joined: 03 Oct 2012
Posts: 478

PostPosted: Wed Sep 11, 2013 5:58 am    Post subject: AC Hissing Reply with quote

Hey guys,

My AC hisses when it's on. Anyone else's do this? It sounds like pressure is being released in varying intensities. It's pretty loud and another one of those things that makes my passengers ask, "What the hell is that?"

It's coming from under the dash somewhere and it comes and goes, louder at times. Not sure if it's the coolant converting to gas, a vacuum line or what.

AC works well.
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ShipFixer



Joined: 24 May 2009
Posts: 420
Location: Arlington, VA

PostPosted: Wed Sep 11, 2013 6:17 am    Post subject: Reply with quote

Sometimes that's a sign of low refrigerant...
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disallow
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Joined: 13 Aug 2008
Posts: 2689
Location: Winnipeg, Canada

PostPosted: Wed Sep 11, 2013 8:16 am    Post subject: Reply with quote

mine did the same. Its not cooling, and it hisses.

It was low on refrigerant, as soon as I topped it off, it cooled great and the hissing went away.

I've never had to top off again either, I assume it leaked out of the seals on the compressor, and the new refrigerant I put in has a lubricating leak sealer, I think it makes the seals swell to prevent more seapage.

If there is a leak elsewhere in the system, this may not be the solution.

t
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 315000kms (195000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Bilstein 4600 rear shocks, Cooper Discoverer ATw P265/70/16
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NmexMAX



Joined: 11 Oct 2010
Posts: 796
Location: Northern New Mexico

PostPosted: Wed Sep 11, 2013 10:51 am    Post subject: Reply with quote

Mine does this only when I come close to or to a complete stop. I've also seen my AC condenser fan doesn't work. Doesn't spin when the AC is on.

AC blows cold when driving, but not when at a stop.
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DanJetta



Joined: 03 Oct 2012
Posts: 478

PostPosted: Wed Sep 11, 2013 11:49 am    Post subject: Reply with quote

I think you're all correct... it all sounds like what mine is doing. I'll top off the refrigerant and see if that helps.

I'm hoping I don't have the issue with the rear AC lines yet. We'll see.

Thanks much for the feedback!
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Joined: 13 Aug 2008
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Location: Winnipeg, Canada

PostPosted: Wed Sep 11, 2013 11:57 am    Post subject: Reply with quote

I think the rear AC lines are aluminum, which means they won't rust, but will rub through pretty easily...
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'05 Pathfinder SE Premium 4x4 - 315000kms (195000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Bilstein 4600 rear shocks, Cooper Discoverer ATw P265/70/16
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Taavi



Joined: 27 Jul 2010
Posts: 79
Location: Estonia

PostPosted: Sun Sep 22, 2013 11:52 am    Post subject: Reply with quote

I had exactly same symptoms. Turned out that AC pressure was low. Next I found a leak in rear AC lines under the body. First I was lucky, workshop was able to weld and stop the leak.
2 years later, same problem. Now the AC lines are replaced with somekind of rubber lines.

disallow wrote:
I think the rear AC lines are aluminum, which means they won't rust, but will rub through pretty easily...

I do not agree with this, mine looked like rusted (under dirt and salt).
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Taavi



Joined: 27 Jul 2010
Posts: 79
Location: Estonia

PostPosted: Sun Sep 22, 2013 11:52 am    Post subject: Reply with quote

I had exactly same symptoms. Turned out that AC pressure was low. Next I found a leak in rear AC lines under the body. First I was lucky, workshop was able to weld and stop the leak.
2 years later, same problem. Now the AC lines are replaced with somekind of rubber lines.

disallow wrote:
I think the rear AC lines are aluminum, which means they won't rust, but will rub through pretty easily...

I do not agree with this, mine looked like rusted (under dirt and salt).
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JAHBLESSINGS
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Joined: 13 Oct 2008
Posts: 1399
Location: 90 DEGREES FLORIDA

PostPosted: Mon Sep 23, 2013 3:07 am    Post subject: Reply with quote

NmexMAX wrote:
Mine does this only when I come close to or to a complete stop. I've also seen my AC condenser fan doesn't work. Doesn't spin when the AC is on.

AC blows cold when driving, but not when at a stop.

i had the same ac only cooling when driving issue also. i cheched the ac fan a noticed it was not running. i removed it and wired in a aftermarket 8 inch unit that made a world of difference. i only used two of the four wires from the oem ac fan. taped up the other two.
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JAHBLESSINGS
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Joined: 13 Oct 2008
Posts: 1399
Location: 90 DEGREES FLORIDA

PostPosted: Mon Sep 23, 2013 3:10 am    Post subject: Re: AC Hissing Reply with quote

DanJetta wrote:
Hey guys,

My AC hisses when it's on. Anyone else's do this? It sounds like pressure is being released in varying intensities. It's pretty loud and another one of those things that makes my passengers ask, "What the hell is that?"

It's coming from under the dash somewhere and it comes and goes, louder at times. Not sure if it's the coolant converting to gas, a vacuum line or what.

AC works well.

sounds like you might have a evaporator leak since it's loud from the passenger side in the truck . check the freon level and the ac fan to make sure it's functioning properly.
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DanJetta



Joined: 03 Oct 2012
Posts: 478

PostPosted: Tue Sep 24, 2013 2:39 pm    Post subject: Reply with quote

Alrighty, so I put in a full can of coolant and the hissing is gone.

The process was confusing, though. When I connected the gauge, the meter went from "way overcharged" to the low part of "normal" as the compressor clicked on and off. Adding a full can didn't cause the level to read any differently. Makes me wonder how much coolant this thing takes.
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