a/c question
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1st Gear Member
Joined: Oct 2003
Posts: 101
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a/c question
My compressor clutch does not engage all the time even on max ac. I had it in the dealer today and they said its normal to cycle when its cold out. Is this connected to the compter so that the comp clutch "knows" how cold it is? I have 2000miles left on the warranty and dont want to pay in the summer. BTW its in the 20s here.
Joined: Oct 2007
Posts: 21
From:
RE: a/c question
It is normal.
The job of the compressor is to raise the pressure of the refrigerant from a low pressure gas to a high pressure gas. The gas is turned into liquid in the condenser, which is located in front of the radiator. This is where the air conditioning system tranfers the heat to the outside air. The more heat that it can transfer, the lower the system pressure will be. The liquid is then metered into the evaporator coil located inside of your passenger compartment. The blower fan blows air across the evaporator coil. The temperature of the air drops as it passes over the evaporator coil. This is the cool air you feel out of your vents. The refrigerant inside of the evaporator “boils†as it absorbs the heat from the air that is being blown across it. As this gas inside of the evaporator coil continues to absorb heat, the pressure of the gas will continue to rise. In the winter, there is not as much heat to absorb so the pressure does not rise as fast. The gas from the evaporator goes to the suction of the compressor and it starts the cycle all over again. A pressure switch monitors the pressure of the gas as it enters the compressor. If it gets too low, it will turn off the compressor until the gas pressure rises to a predetermined value. The compressor will then turn on again to lower the pressure and pump the refrigerant through the system. During the summer months, the evaporator absorbs heat at a high enough rate that the compressor may never cycle off, but in the winter, it is normal for compressor to cycle off due to the low load on the air conditioning system and the fact that it can transfer a great deal of heat to the atmosphere via the condenser because of the low outside air temperatures.Both of these conditions contribute to lower compressor suction pressure, thus causing the compressor to cycle on and off based onpressure.Hope this helps.
The job of the compressor is to raise the pressure of the refrigerant from a low pressure gas to a high pressure gas. The gas is turned into liquid in the condenser, which is located in front of the radiator. This is where the air conditioning system tranfers the heat to the outside air. The more heat that it can transfer, the lower the system pressure will be. The liquid is then metered into the evaporator coil located inside of your passenger compartment. The blower fan blows air across the evaporator coil. The temperature of the air drops as it passes over the evaporator coil. This is the cool air you feel out of your vents. The refrigerant inside of the evaporator “boils†as it absorbs the heat from the air that is being blown across it. As this gas inside of the evaporator coil continues to absorb heat, the pressure of the gas will continue to rise. In the winter, there is not as much heat to absorb so the pressure does not rise as fast. The gas from the evaporator goes to the suction of the compressor and it starts the cycle all over again. A pressure switch monitors the pressure of the gas as it enters the compressor. If it gets too low, it will turn off the compressor until the gas pressure rises to a predetermined value. The compressor will then turn on again to lower the pressure and pump the refrigerant through the system. During the summer months, the evaporator absorbs heat at a high enough rate that the compressor may never cycle off, but in the winter, it is normal for compressor to cycle off due to the low load on the air conditioning system and the fact that it can transfer a great deal of heat to the atmosphere via the condenser because of the low outside air temperatures.Both of these conditions contribute to lower compressor suction pressure, thus causing the compressor to cycle on and off based onpressure.Hope this helps.
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