why does my ac compressor turn on and off

I have 2011 Mazda CX7. When I first turn the car on I can see the A/C clutch being engaged, but after the car runs for bit, then clutch disengages. After a while it starts to engage for few seconds and than back off for about 10-15. While A/C clutch is engaged, pressure gauge shows it to be on bottom side of green. I have followed direction on bottle of A/C Pro to fill my unit. But it have not made any difference. It seems that sometimes it decides to start blowing slightly colder air while other times it just blows hot air. After taking it to Pep Boy's for diagnostics. It turned out to be a relay. Once relay was repaired it turned out that I overcharged the system. Now I taking it to service for evac and recharge. In the end $49 for diagnosis, $60 for evac and recharge, $40 for bottle of A/C pro. In the end I feel lucky to get system repaired for under $200.


If I took it to get it diagnosed in the first place it would have cost me whole lot less. Lesson Learned: Do not charge system unless you have a gauge to read both LOW and HIGH pressure. Next time before I waste money on charging system I will buy the following gauge
Is your air conditioner running for 2 minutes, turning off for another 2, then turning on again? This is called short cycling. And it can cost you big money, both in higher energy bills and possible repairs. We re going to be honest with you: this problem could be caused by a LOT of different things. So it s difficult to troubleshoot without seeing and hearing the problem. However, we ll go through some of the most common causes. Bad thermostat placement (or a bad thermostat) Your thermostat should be placed in a central location, away from windows and air vents.


A thermostat that is near an air vent can be tricked into thinking your home is cool because it senses the cool air blowing over it. Similarly, one near a window may turn on frequently because the sun heats up the surrounding area, making the thermostat think your home is warmer than it really is. The culprit could also be a bad thermostat. A dirty air filter If it seems like this is a possible problem in almost every article we write, it s because it is one of the most common causes of AC problems. In this case, a dirty filter can restrict airflow to your air conditioner to the point where your coils freeze up. This would cause the air conditioner to shut off prematurely (before it had finished cooling your home to your set temperature).


Then, a few minutes later, your thermostat will turn your air conditioner on again and the cycle will continue. Refrigerant leak Your air conditioner could be low on refrigerant. Similar to a dirty air filter, this will cause your coils to freeze and the air conditioner to turn on and off for short intervals. Related: Important note : If an air conditioning company determines this is the cause, don t let them simply top off your air conditioner with more refrigerant. Refrigerant isn t used up like gas in a car. It is constantly re-used. So, if you re low on refrigerant, you have a leak that needs to be fixed. Otherwise you ll have the same problem again later. Dirty condenser coils If you haven t had, the short cycling could be caused by dirty condenser coils. These coils are in the outside unit of your air conditioner and are responsible for dissipating the heat from your home to the outside air.


When they get dirty, their job gets harder. And as your air conditioner struggles, it can overheat and shut off. An air conditioner that s too big for your home If you ve always had this problem, or it just started when you got a new air conditioning system, it could be that the AC system you installed is too big. An oversized air conditioner will quickly cool your home and then shut off. While this might seem like a good thing (it only takes 2 minutes to cool your home off! ), this can actually increase your energy bills and lead to uneven cooling in your home. Need a professional air conditioning company in the Dallas, Georgia area to take a look at your AC that keeps turning on and off?.

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