2008 JK AC cycling!
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JK Newbie
Joined: Sep 2019
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From: USA
2008 JK AC cycling!
My 2008 JK’s AC has been cycling. Took it in for a recharge but still same issue. Have not noticed pooling of water, so don’t think system is freezing up. Based on looking at forums, seems most likely issues are overpressurized charge, a bad AC clutch/switch, or a faulty expansion valve. Is anyone aware of any frequent issues with the 2008 JK I should ask mechanic to check? Trying not to get taken for a ride, not well versed on AC issues.fedloan irs.gov easybib
Last edited by kimblegomes; Oct 2, 2019 at 08:30 AM.
JK Jedi
Joined: Jun 2013
Posts: 11,360
Likes: 2,089
From: Willow Park, TX
So, this isn’t really JK specific, but more that every ac system in a car is operating the same way. I just went through rebuilding the ac system on a cheap commuter car I picked up. I pretty much spent ~$350 in parts, replacing the compressor, a high pressure line, condenser, dryer, expansion valve, and all seals along the way. “Borrowed” a vacuum pump and manifold from the auto store. I would go to Autozone, O’Reilly, or similar and get a manifold gauge. Pretty simple to use. Hook it to high and low pressure ports and get your readings. Then, there are sights that can help you interpret the readings. I am definiltey not an ac expert, but the system was pretty easy to work with on my vehicle.
If you do borrow a manifold or buy one from HF for yourself, mind the open/close knobs on the unit. First, verify that the knobs on the manifold itself are turned completely clockwise to ensure those ports are closed, otherwise when you connect to the high/low pressure ports you’ll lose refrigerant. The connections to the high and low pressure lines have to be closed to connect to the ac system’s ports (turned full counter-clockwise). Once you connect them to the H/L ports, you turn the knob all the way clockwise to OPEN the line (the open/close status is opposite between the knobs on the manifold and the knobs on the hoses).
Things that would make your compressor cycle: 1) the compressor clutch is starting to go out, 2) refrigerant is low and pressure sensor is picking that up, 3) pressure sensor is faulty. The manifold should really help narrow things down.
This isn’t the site I was looking to link for you, but it is very similar –
https://axleaddict.com/auto-repair/D...sis-by-Symptom
If you do borrow a manifold or buy one from HF for yourself, mind the open/close knobs on the unit. First, verify that the knobs on the manifold itself are turned completely clockwise to ensure those ports are closed, otherwise when you connect to the high/low pressure ports you’ll lose refrigerant. The connections to the high and low pressure lines have to be closed to connect to the ac system’s ports (turned full counter-clockwise). Once you connect them to the H/L ports, you turn the knob all the way clockwise to OPEN the line (the open/close status is opposite between the knobs on the manifold and the knobs on the hoses).
Things that would make your compressor cycle: 1) the compressor clutch is starting to go out, 2) refrigerant is low and pressure sensor is picking that up, 3) pressure sensor is faulty. The manifold should really help narrow things down.
This isn’t the site I was looking to link for you, but it is very similar –
https://axleaddict.com/auto-repair/D...sis-by-Symptom
Last edited by resharp001; Sep 30, 2019 at 08:28 AM.