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Old 05-17-2018, 08:18 PM
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Odd A/C issue???

Quick explanation - I hit my remote start today, A/C was off and 5 seconds after starting, I got a hissing and vapor cloud under the left front near the A/C compressor spraying downward. I immediately shut the engine off. There is a bright green liquid on the left frame rail near the LF shock and some on the ground - as in maybe a couple ounces or less. It smells like freon/PAG oil and looks like A/C leak dye. I started the Jeep back up, no noise, no venting, A/C works fine, blows cold and everything seems normal. WTF?

More details - '15 JKU with 34k miles on it. I bought it 14 months ago with 29k miles - everything has worked perfectly since I bought it, A/C normal, never have seen this issue before. First I thought it was a coolant line that blew out - but my coolant is not green. I drove a couple miles down the street and stopped at the dealer to look for a tech, they had all just left, so I chatted up two Service Writers and at first got the '$100 Diagnostic Fee' line and 'make an appointment' but I kept talking, obviously know what I'm talking about and they got interested. They both looked at it, checked my VIN (out of warranty, of course) but they were both stumped. Some other guy who worked there (no clue what he did) talked to me for a few and we discussed A/C leaks, factory injected dye on the assembly line and over-pressured systems. He suggested perhaps it was venting an over-pressure in the system. I wasn't going to argue with him - I do not know a lot about Jeeps specifically, but after being a Honda Tech for years and working on a lot of A/C systems -I have NEVER heard of such a thing. As far as I know, an A/C system is sealed and there is a pressure switch that will shut the compressor off it there is an over-pressure or an under-pressure in the system. If indeed it was over-pressurized, why vent today at 84° when it didn't after doing the same thing - running errands and parking, remote start, etc when it was 92° out? I haven't had the A/C system worked on since I bought it in April of 2017 and it hasn't vented like that before.

Any thoughts, ideas, theories, ramblings or answers? I'd love to hear them.

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Old 05-17-2018, 08:39 PM   #2
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If you used to be an A/C tech, if you still have a set of gauges, you might put them on the system and see what the pressures are. That would probably tell you more than most of us.

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Old 05-17-2018, 08:45 PM   #3
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I don't know what the problem could be if there actually is one. However, JK's do have an A/C pressure relief valve. If it was overcharged at some point, which it could have been since it was purchased used, then the excess pressure could have vented. As rgreen65 mentioned, check the system.
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Old 05-17-2018, 09:22 PM
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They do have a pressure relief valve? I have never heard of that before. I never had an A/C gauge set - our dealership had certain specialty tools so I never needed them. A/C was not my specialty either. It is still working great today too. I'm going to have to look into the pressure relief more too. I'll have to check back with the dealership when more techs are around to talk to. Thanks!
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Old 06-15-2018, 07:46 PM   #5
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I too am having the same issue. Third time it happen it would not produce cold air. Took it to a mechanic who advised it was low on Freon, which was added. 4 days later it blow again. They were unable to diagnose a cause. Each time it has blown it only last a few seconds. any suggestions or ideas?
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Old 06-15-2018, 11:14 PM   #6
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For what its worth: Having had something extremely similar on a non jeep. Yes ac is a sealed system on all cars. But if the pressure gets too high it will bypass an o ring somewhere. The expansion valve is what generally controls the difference between the high and low sides and would be the first suspect. An evacuation of the system, replace valve, flush and fill will probably clear up the issue.

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a/c , air conditioning , dye , leak , venting

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