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Intermittent ac problem

2007 Focus. The a/c intermittently comes and goes. This is primarily a back and forth to work car. The a/s always works in the morning, during lunch and when I leave in the late afternoon. Some days while driving home, the compressor stops engaging and thus the a/c stops blowing cold and won't work for thew rest of the day. The next moring it will be fine again, and may be fine for several days. In the spring of this year I took it to the dealer, they drained and recharged the system. This certainly appears to be an electronic issue. Any help is appreciated.

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Assuming the Dealer used a Vacuum pump on the system when they drained it, the moisture should be out of it. There are 2 pressure switches which can be switched and the unit does not have to be discharged to do this. I have had problems more with the Low pressure switch than any High pressure one. The spring or diaphragm gets weak and it may disconnect power to the compressor randomly.
Now another thing you said was when driving home you have more problems. If you are driving into the Sun some A/C units behave differently. Some units have a Solar sensor which aids A/C output by taking into account the Solar radiation penetrating the car interior. This loosely follows the logic that shade and Sunshine are not equal measures of temperature and that Fabric surface temperature can vary regardless of the air temperature depending on if the Sun is beating down on it.
Not all vehicles have this system. But it is a factor to bring up.

Posted on Jul 09, 2013

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Posted on Jan 02, 2017

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SOURCE: 97 Olds Aurora AC blowing warm air a day after recharging system

Several- The system should hold freon for years without leaking. There are pressure switches and they cut off the compressor with an undercharge and an overcharge. You need guages to measure the charge. There are testers the A/C shops have called "sniffers" which can detect a leak. If you have no leak then you need a technician to add or remove freon to get the concentration right. Or you need guages.

Posted on Jun 12, 2009

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SOURCE: 2000 Mitsubishi Spyder ac replay intermittent trouble

two things you may try, relocate ambient sensor to colder place, remove it from front bumper, and connect the two wires on refregerant temp sensor located @ rear of compressor, be carefull and observe your a/c system after doing this

Posted on Jun 21, 2010

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SOURCE: I have a 2008 Honda

Well I have a few Ideas for you. One, it has a leak and your dealer needs to find it..... Now if he is using a recover machine that weighs out the same refrigerant as he is putting in, I would say, ok, no leak you have other issues. One is has he used or is he using die in the oil. If so he needs to replace the receiver/drier replace the TXV valve and run a cleaning (flush) agent through your system. If you do not have a leak then there is too much oil in the system and he is adding to that oil with die every time he is adding die to the system. If you pull out all the freon then add it back the oil gets pulled out of the evap and condenser coils for a brief time, as you run the A/c it will work it's way back into the evap. where it hurts the systems ability to cool. Next Idea, is to teach you how to put freon in it your self. But first have the dealer run the flush through the system replace the drier, and see how long it last then. If he does that and that does not fix it. learn how to add freon, it is very easy.

Posted on Aug 23, 2011

SOURCE: The A/C in my car works intermittently. When it does come on, it works fine and blows very cold air. But sometimes the compressor doesn't come on at all. Is this possibly just a switch not work

In this case you may have one of two things going wrong, Either there isn't enough freon in your a/c unit or you have a bad switch

Posted on Jun 27, 2012

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