I don't know about the lube as I belive the oil in the system is mixed with the refrigerant and spread throughout the system, coating the insides so unless the system has air or moisture in it (witch is very doubtful if it is running properly) I do not think it is necessary to run it just for the sake of lubrication.Corin said:...But I wonder more about how long the AC system will last if it's in constant use? Might that cause something to wear out sooner, or does it really help to "lube" the system so that it lasts longer?
Not necessarilly true... the system will trun the compressor to maintain AC system pressure. It might be less in the cooler months but it is still cycling.njjoe said:
Corin is correct when he says the A/C compressor is not necessarily running just because the A/C light is on. That just means the A/C is available if the conditions warrant.
Not necessarilly true... the system will trun the compressor to maintain AC system pressure. It might be less in the cooler months but it is still cycling.
Regarding lubing the system, at least with older systems and perhaps the new ones as well the system circulates the R42/freon or whatever they use these days which help to lube the fittings/seals.
Really I thought the pressure does change... wouldn't it have to as the system "removes heat" and thus changes temp and pressure? Why does it cycle then?njjoe said:
The A/C compressor does not cycle to maintain system pressure. There is no need for it, it is a closed system. In fact, it is easier to start the compressor after the high-pressure side had bled down. That is why room air conditioners need to wait a minute or so before the compressor can be restarted.
5.03 ounces of oil circulates within the refrigerant (R-134a) loop to lubricate the compressor.
Yes, you are right. Changes in pressure and physical state (gas <--> liquid) of the refrigerant are what is behind the transfer of heat from the evaporator inside the car to the condenser outside the car.Gonzo said:
Really I thought the pressure does change... wouldn't it have to as the system "removes heat" and thus changes temp and pressure? Why does it cycle then?