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Aux Fan Cycles On/Off Every 5 Seconds

Old 04-23-2019, 02:51 PM
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Default Aux Fan Cycles On/Off Every 5 Seconds

So the title says pretty much everything. I have a 99 Cherokee and when I have the A/C turned on the fan will kick on for about 5 seconds then off for about 5 seconds and repeat.
I read that it might be caused by low refrigerant so the other day I filled it up. The cheap gauge that you get with the refrigerant bottles says that it is filled now, but the fan still cycles rapidly.
Also, I went to check it again this morning and was going to fill if needed but the A/C condenser and the lines were frosted up. I'm not sure if that is supposed to be like that, both my last XJ's had non functioning A/C. Of it helps, the weather here is 50's and humid and I had the Jeep running for about 5 minutes before I checked under the hood.
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Old 04-23-2019, 03:04 PM
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The hotter the out side temp gets the longer the fan will run , it is normal .
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Old 04-24-2019, 08:56 AM
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That is a little cold to be checking the functionality of the ac. You would get a better reading when it is in the 70's or warmer. Also, buy yourself a set of gauges from Harbor freight or somewhere, so you can read the high side and low side pressures and get a more accurate reading. Look around online or perhaps purchase a service manual and look for the ac section. There should be a chart that shows what range the pressures should be in at what ambient temperature.
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Old 04-24-2019, 11:15 AM
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Found this. Its the same chart as in my 97 FSM. I assume this is the chart in question?

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Old 04-25-2019, 09:35 AM
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That'd be it.
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Old 04-26-2019, 02:14 AM
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Thanks for the tip. I'll wait 'till it warms up a bit and see how it fairs. It just seemed odd to me the the cycle was so rapid.
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Old 04-26-2019, 08:55 AM
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That can happen when its too cool outside, or if its undercharged. I know my Ranger doesn't have an electric fan, but when it is too cool outside, the compressor will cycle on and off similar to that. I don't know what an XJ will do, mine didn't come with AC lol.
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Old 04-30-2019, 01:04 PM
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Originally Posted by Red1992XJ View Post
That can happen when its too cool outside, or if its undercharged. I know my Ranger doesn't have an electric fan, but when it is too cool outside, the compressor will cycle on and off similar to that. I don't know what an XJ will do, mine didn't come with AC lol.
A jeep with functional A/C is new to me. Haha.
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Old 04-30-2019, 01:38 PM
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In that table you'll see the general rule-of-thumb that the low-side (inlet port) pressure (in psi) should be approximately 1/2 the outside temperature (in deg F).
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