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2005-2010 V6 Mustang Tech Forum

2011-2014 Talk | 2011-2014 GT | 2011-2014 V6 | 2005-2010 Talk | 2005-2010 GT | 2005-2010 V6 | Shelby GT500 | Mustang Tech 
 

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Unread 06-26-2013   #1 (permalink)
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Default 2007 Mustang V6 A/C cycles on and off?

My A/C has been suboptimal. When trying to recharge the refrigerant, the pressure seemed to fluctuate high and low. I got some refrigerant into it though.
I noticed the compressor was cycling on and off at rapid intervals -- a few seconds on, a few seconds off. I noticed the outer portion of the pulley would stop spinning and start spinning (the interior part was always spinning since the belt was moving it). Is this a sign of a bad pulley or does it normally act like that when the compressor is cycling on and off?
I read somewhere about possibly the low pressure switch/cycling switch being bad. I have the part but couldn't get to it buried in there.

Any advice or hints?
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Unread 06-28-2013   #2 (permalink)
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If you know you have the proper amount of refrigerant in there, then my guess would also be the low pressure switch. If impossible to get too, might have to have the work done. Here in Phoenix, was supposed to reach 118 today. It may have made it, my patio about an hour ago hit 117. I took the attached a little while ago.
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Unread 07-18-2013   #3 (permalink)
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Thanks for the reply. I'll have to try to get to that part again to replace it. It seemed awkward to get to.
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Unread 07-19-2013   #4 (permalink)
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You likely don't have enough charge in there, or it is overcharged (less likely).
When the compressor turns on, watch your gauge, and see if the suction side drops; if it gets below around 20 or 25 (somewhere around there), the compressor will shut off due to low pressure. While the compressor is on, you should be able to get enough freon in there to get the charge high enough to keep the compressor running, then get the proper pressure.
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Unread 08-14-2013   #5 (permalink)
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Has the system been open? You could also have a restriction in the receiver dryer or filter for the AC system.
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