A/C Clutch cycles every 4-6 seconds - JeepForum.com
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post #1 of 11 Old 06-05-2019, 09:09 AM Thread Starter
Hudsonhawk59
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Wj A/C Clutch cycles every 4-6 seconds

Hi I hope someone can help with this.

So a/c turned off, fan on manual and set to low, air st to blow in footwell, car stood and idling 500rpm, no error codes
ok with the above in place the a/c compressor cycles on and off all the time if I turn the a/c on it blows very cold and the compressor continues to cycle the same.

I'm not sure where to start looking so any help would be appreciated

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post #2 of 11 Old 06-05-2019, 10:19 AM
jtec
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Are you sure there are NO codes - did you scan?

Anyway - It is normal for AC to cycle, you say its cold your satisfied.

If concerned = pressures both Hi and Low a @150 0rpm - but I think you are OK

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 11 Old 06-05-2019, 02:51 PM
paulvon
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What are your high and low pressures.

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post #4 of 11 Old 06-06-2019, 11:28 AM Thread Starter
Hudsonhawk59
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Not sure how to check the pressure and dont have the tools to do it, have read several posts that say the a/c system may need re-pressurising, so although its blowing cold air I will do that first.

I still dont understand why the a/c pump should be cycling even though the a/c is switched off and the cabin air is directed to the floor ( so no defrost options set)
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post #5 of 11 Old 06-06-2019, 11:37 AM
LuthWJ77
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I think we all missed the part where you said it was off and still cycling. Shouldn't be doing that. What happens when you turn whole system off not just AC button? Any difference?

If you go to a parts store they'll have recharge kits that come with a cheap gauge to at least check the high side. If it's cold I wouldn't bother sounds like the not turning off thing is your real issue for now though.
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post #6 of 11 Old 06-07-2019, 12:26 AM Thread Starter
Hudsonhawk59
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Will turn off the hvac completely and see what happens, I live in the UK, in the country we do have parts stores but they dont have the sort of equipment that you guys in the states seem able to hire.

Unless of course anyone on here from Norfolk UK that knows of anywhere ?
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post #7 of 11 Old 06-07-2019, 12:29 AM Thread Starter
Hudsonhawk59
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Mis read that, I could buy a cheap kit of ebay, but like you said its cold so getting a recharge was last resort. Will investigate the electrical side of it.
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post #8 of 11 Old 06-07-2019, 03:34 AM Thread Starter
Hudsonhawk59
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OK so I started again with fresh eyes.
all settings below tried with temperature at max then min

AZC turned off:- compressor does not cycle
AZC set to footwell A/C off:- compressor does not cycle
AZC set to footwell and dash vents A/C off :- compressor does not cycle
AZC set to dash vents A/C off:-compressor does not cycle

AZC set to footwell and windscreen A/C off :- compressor cycles
AZC set to windscreen A/C off:- compressor cycles

with that all said should it still cycle every 4-6 seconds.

I have owned the car for 5 years and I have never had the a/c system serviced or recharged and I have no idea if the previous owners did so, I do remember that after I bought the car the a/c compressor was disconnected at the electrical connector, this is what has lead me to believe there was a problem.
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post #9 of 11 Old 06-07-2019, 08:23 AM
Magnum
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Possible causes can be undercharged, overcharged, air and moisture in system, blocked orifice or expansion valve, bad compressor...
You really need to put a set of gauges on it to see what is happening. There are standard tests - checking pressures with system off, then with AC on. Those tests will give a good indication of what is going on. Without gauges, you're just guessing. In the states, anyone can buy the gauges. We just cannot purchase certain refrigerants without being licensed. I have no idea if you can purchase the gauges in the UK, or if they are restricted.

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post #10 of 11 Old 06-07-2019, 08:27 AM
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Sounds like it's working correctly to me. Set to windscreen depending on if it's fogged up or frozen over you'd turn the knob hot or cold appropriately but I would assume compressor is still cycling in case it's called for. You'd need it to defog but not to defrost but system wouldn't be smart enough to decipher. Once it warms up you may notice it cycles longer but that sounds about right and I live in Houston where it's mid 90s for half the year.
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post #11 of 11 Old 06-07-2019, 11:16 AM
jtpeters
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Sounds like correct operation to me.
Defrost (windscreen) = A/C compressor cycling.

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