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Thread: A/C question.

  1. #1
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    A/C question.

    2000 TJ 4L flex O lite fan.

    I notice the A/C clutch keeps cycling on and off when i have the A/C on. I was under the impression that the clutch should stay engaged the entire time.

    The other problem is the fan kicks on and off with the clutch so both are cycling constantly.

    Is this normal or could the fan be overloading the circuit and causing the cycling or could this be from a high/low pressure issue?

  2. #2
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    Re: A/C question.

    I'm kind of leaning towards it being a high/low pressure switch because the relay in the fuse panel under the hood is actually cycling on and off too.

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    the a/c compressor is supposed to cycle on and off as controlled by the hi and low pressure switches. the engine fan will also cycle with the a/c clutch as it needs to pull air through the condenser to cool the gases before they enter the evaporator core in the cab. so yes this is normal

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    Ok, I knew the fan turning on and off with the clutch was normal. I just didn't realize that the clutch would cycle. I thought maybe it was being caused by the extra load of having the electric fan running on the same circuit.

    Thank you.

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    If it is cycling a lot, (eg: on 30secs, off 30secs) then I would have the system checked for pressure. When it starts getting low it will cycle on and off a lot. If the pressure drops too low, it will not come on at all. There is a pressure switch that shuts it down to keep it from running dry.
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    Its actually more like every 4-5 seconds... Hence why I figured there was a problem. But the AC line gets cold and blows cold.

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    Like on for 5, off for 5? Your charge is very low and it should be serviced. Clutch cycling can run from 1 to 2 minutes. Since you still have some charge in the system you could also try the top-up-in-a-can stuff from parts stores. It's about $50 in a kit.
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    Re: A/C question.

    Ya it's about a 50/50 cycle every 4-5 seconds. I was thinking the parts store recharge if it was low.

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