'14 JKUS A/C control issue - Jeep Wrangler Forum
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Old 07-28-2016, 10:44 PM
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Join Date: Dec 2013
Location: Middle TN
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Lightbulb '14 JKUS A/C control issue

OK. So I have read dozens of posts on here from folks having heat/A/C issues, but I haven't seen one quite like mine. Similar, but mine has an interesting twist that may lead me to the control module as the culprit.

My A/C is the same temperature no matter where I turn the dial ( I don't have climate control), even all the way to red and it still blows ice cold. When I turn off the A/C the temp also stays constant no matter where the dial is (blue or red), so I tried burping the radiator, adding coolant to the overflow, etc...all the stuff that everyone else has tried or suggested for this problem. My engine temp rises as it should, but definitely doesn't OVERheat, and I have now driven a few thousand miles with this condition.

Knowing that I have until the dead of Winter to really worry about this has made me sort of lazy in finding a solution...until today while I was changing my oil I had a revelation that may point to the control module itself with some certainty.

With the A/C OFF, as I mentioned, the temp doesn't change with the rotation of the temp dial...BUT when I turn it to defrost, the A/C compressor kicks on and blows ice cold air at the windshield, and the A/C LED is NOT illuminated.

Has anyone else experienced this oddity? I figured I would ask before I buy another module. I think I could probably test my module with a multi-meter if i had access to a schematic, but other than that I don't think I would trust the dealer to troubleshoot this issue, as I have 66K on this Jeep and no extended warranty.

Does anyone have any tips for testing/troubleshooting the control module?

The only other thing that I can think of (that may be MY fault) is that when I ran my amp wire through the rubber plug in the firewall up in the passenger wheel well, perhaps I nicked a wire in there or knocked a connector loose...but I doubt that, as I haven't blown any fuses, and I do have A/C functioning still. The last 3 Winters I have had absolutely nuclear heat from this Jeep.

I look forward to hearing if anyone else has seen anything like this.

Thanks,
Joe

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a/c , control module , heat , hvac

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