![]() (The refrigerant holds and circulates the oil as well! Especially if you begin to run low on refrigerant. As you will see, if they run without pumping the lubrication can become a problem. ![]() (negative impact on fuel efficiency)Īlso, some of the variable compressor did not last long when they were not used. It will cause wear and it draws a little power from the engine as well of course. The problem with this approach is that your variable compressor runs as soon as the engine starts, even if you are not using the AC. You will see that a variable compressor will run continuously, but the volume of refrigerant it pumps is controlled. We will see in more detail how the variable compressor works. Depending on the system and the circumstance, your clutch will cycle on and off all the time, usually with an interval of 20-60 seconds or so. On most cars you will hear a very distinct “click” when the clutch engages. On a clutch only system the compressor clutch is activated based on the low pressure part of the system. Combined clutch/variable is the most common variant these days. The main difference tends to be whether they have a clutch system or variable or a combination of both.Ĭlutch only, you will find on older systems/cars (E.g. There are a number of different compressors out there. It is probably a little more advanced now. This is the functional diagram of the Ford Fiesta AC system. Of course, these days on our modern cars the AC is controlled through various systems and has multiple sensor providing input (internal- external temperature, sunload (that little plastic blob on your dashboard close to the window!), various system pressures and temperatures. Here is a good explanation on how your car AC system works, showing some more detail, I don’t want to go into to much details/physics. In essence that is all, in reality it is a bit more complex, but not by much. The evaporator tends to be buried deep down in your dashboard. The expansion valves controls the amount of refrigerant flowing through the evaporator based on the upstream temperature of the refrigerant. Then cooled down, it is led through a drier absorbing any moisture. With the help of a fan it is cooled down. The condenser is usually fitted at the front of your car, either in front or behind the radiator. The compressor compresses (duh!) the refrigerant and pushes it through the condenser. I am not going to explain in detail how an AC system works. Mostly all mechanical so I hope most folks can follow! So buckle up and lets rip this compressor apart!! It is going to get a bit technical, if not nerdy. I also wanted to take this compressor apart to see if, over time, I can make it into one of these ‘cut-away’ display thingies. Usually I manage to put things back together. They only noticed when it was getting cold in the sitting room, and they had to call in a specialist to put it back together again. Apparently I took our central heating furnace apart when my parents were not looking. Initially, I did have problems putting stuff back together again. According to my mum I started taking things apart from when I was about 3 years old. I thought it would be interesting to open it up and get a feel for what is inside. Recently my friendly AC specialist and neighbour Jack and I replaced the AC compressor on the Fiesta. At the end of this post I will provide links to each repair job. All detailled in my thread of fiddling with my cars. I have worked on the AC systems of my Jeep Cherokee and my wife Ford Fiesta during the last 12 months or so. We have some excellent threads on the forum about airconditioning, notably car AC systems, obviously!
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