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Old 05-04-2014, 02:22 AM
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WK2 AC compressor cycle on off

Hi, I just charge my grand cherokee 2011 AC with freon then I noticed the AC compressor going on the off every 10 second. I've asked the mechanic and said it's normal. Like TOYOTA.
Is this normal??
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Old 05-04-2014, 06:34 AM
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Re: WK2 AC compressor cycle on off

IIRC that is pretty much normal.. almost all modern vehicles cycle the compressor clutch.

Why did you have to charge the system? If not done correctly, you could be getting a high-pressure or low-pressure cutout.

...tom
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Old 05-04-2014, 03:47 PM
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I've charge it due to it was not cooling well. So, after checking found low pressure. Then I notice the cycling. It wasn't cycling before that day.
The period between cycling 10 second! That why I have the doubt if it normal or not because of the short period.
I really don't know if the pressure become hi or not. How can I check? What is the normal pressure?
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Old 05-04-2014, 04:56 PM
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Re: WK2 AC compressor cycle on off

Unfortunately, you need to hook up a gauge manifold to see what's going on.

adding freon to a system that doesn't cool well almost never solves the problem; been there, done that

setting the AC controls to high fan, dash vents, and leaving all the windows open will pretty much avoid compressor cycling due to evaporator temperature (which is the normal reason for cycling).. but in my experience low charge usually ends up giving you a 5-15 second cycling time.

.. but you can't just add freon until that behavior goes away, you need to get the system checked out.

..tom
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Old 05-05-2014, 06:06 AM
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Conversely, adding r134 to my various cars' AC system has worked for me every time, personally. Aside from the time a mouse chewed through the compressor wires, of course.
Most folks I know that have tried recharging the refrigerant unsuccessfully didn't shake/roll/tilt the can of refrigerant enough while they were filling it, so it didn't actually fill the system.

I do have one if the filler hoses with a gauge on it though, so I've never over filled it.
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