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Old 07-14-2009, 12:07 PM   #1
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AC constantly disengaging engaging.

In my 03 Svt, my AC is ice cold and works fine, however it sounds like it is constantly engaging and disengaging? Any idea what this could mean? If im sitting at a light you can hear it click on and off about 5 times. The air is always cold.

Could this be low coolant? Bad AC clutch? anyone ever come across this?


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Old 07-14-2009, 12:52 PM   #2
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It is normal for the compressor to cycle. Excessive cycling is an indication of low refrigerant; however, if your AC is "ice cold," then the cycling must be normal operation. If it did not cycle when it was running very cold, the condenser could ice-up. To prevent this, the AC cycles.
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Old 07-14-2009, 03:49 PM   #3
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hmm i learned something new, yay my ac is fine WOOT!
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Old 07-14-2009, 04:40 PM   #4
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I would recommend that you check the low side pressure though. There's some common confusion with how refrigerant works. It is fairly simple though. The more refrigerant is in the system, then the higher the pressure is, and vice versa. Where the confusion comes in is that people think that more refrigerant = lower AC temperature. It's really the other way around. The pressure basically corresponds to the temperature of the evaporator in F. It's a little different for 134, but close enough. Your low pressure, or cycling switch, cuts power to the clutch when pressure drops below 20 psi. As Penguin said, this keeps the evaporator from freezing. Your pressure should drop no lower than 34 psi when the compressor is running. If it's going lower than that and cycling the low pressure switch as a result- it won't be long before you're searching out the leak if that is the case.

It could be something else entirely though- like the clutch, or the temperature selector. I'm not disagreeing with Penguin though because I firmly believe you shouldn't fix what's not broken- I'm just being a good boy scout about it.
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Old 07-14-2009, 06:25 PM   #5
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You will also find that if you put the air on defrost, it will cycle as well. One winter I was sitting there with the defrost on and the heat turned up and it was cycling.
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