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Unread 04-05-2010, 01:23 PM   #1
Gomofast
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2008 JK Wrangler 
 
Join Date: Mar 2005
Location: Wappingers Falls, NY
Posts: 287
A/C low pressure switch

Can you replace the low pressure switch without venting the system? I need to replace the switch, but I don't know if all the freon is gonna come out. It would be lovely if the bung was fitted with a schrader valve to maintain system pressure when changing the switch.

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08 JK Unlimited X, 2" Black Diamond lift, 33's, 1.5" wheel spacers, stubby bumper mod.

98 TJ Sport, 4" Rough Country Lift, homemade discos,
35" BFG Mud Terrain T/A KM's, 4.56 gears, Detroit Truetrac
up front, factory Trac-Lok out back,Warn M8274 8000lb
winch, York OBA, rock guards, custom intake, 48" HI Lift.
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Unread 04-05-2010, 02:30 PM   #2
Slithering_Joe
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Join Date: Jun 2005
Location: Nobama, Morris County, NJ
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According to the 2005 KJ service manual is not neccessary to discharge the A/C system to remove the switch.
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Unread 04-06-2010, 02:19 PM   #3
Gomofast
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Quote:
Originally Posted by Slithering_Joe View Post
According to the 2005 KJ service manual is not neccessary to discharge the A/C system to remove the switch.
So there must be a valve built into the bung (where the switch screws in) to retain pressure?
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08 JK Unlimited X, 2" Black Diamond lift, 33's, 1.5" wheel spacers, stubby bumper mod.

98 TJ Sport, 4" Rough Country Lift, homemade discos,
35" BFG Mud Terrain T/A KM's, 4.56 gears, Detroit Truetrac
up front, factory Trac-Lok out back,Warn M8274 8000lb
winch, York OBA, rock guards, custom intake, 48" HI Lift.
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Unread 04-06-2010, 03:43 PM   #4
Slithering_Joe
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1998 TJ Wrangler 
 
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Location: Nobama, Morris County, NJ
Posts: 2,443
Quote:
Originally Posted by Gomofast View Post
So there must be a valve built into the bung (where the switch screws in) to retain pressure?
I would assume it is has a Schrader valve just as in the Ford A/C system. (My GM turd does not. You must evacuate the system to replace the switch.)
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Unread 05-13-2011, 07:34 PM   #5
Libbyowner
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I bought a jeep few months ago. And make the long story short, I just found out I need to get the low pressure sensor switch/sensor replace. So, do I have to vent out the system before I unscrew the sensor?
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Unread 05-13-2011, 07:42 PM   #6
Libbyowner
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P.s. Is there a schrader valve in the low pressure sensor?
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Unread 05-13-2011, 10:42 PM   #7
richd
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According to my SM,it says you dont need to discharge the A/C system to replace switch.
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Unread 03-25-2012, 09:47 AM   #8
Libbyowner
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So here is my answer to the Jeep liberty A/C problem. According to my AC mechanic, it is a very common issue with the Chrysler AC compressors.

1. Turn on your AC to full blast in a warm day.
2. Open the hood, locate the AC compressor which should be on top and right in front of you.
3. Use a stick or a rock (just anything but your hand), and turn the compressor clutch clockwise.
4. If it engaged, cold air should flow into your car, which means your AC actually works, it just needs to re-shim.
5. Go to locate AC/Radiator specialist, pay them $50, it should take about 30 mins and you should be good to go.
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a/c , ac switch , low pressure , pressure switch

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