大連車載空調由壓(ya)縮(suo)(suo)機、冷(leng)(leng)(leng)凝(ning)器(qi)、節流(liu)元件(jian)、蒸(zheng)發(fa)器(qi)、風機及必要的控(kong)制(zhi)部件(jian)構成，用于調(diao)節車內(nei)(nei)(nei)溫度(du)(du)、濕度(du)(du)，給乘員提供舒適環(huan)(huan)(huan)(huan)境的空(kong)(kong)(kong)調(diao)系統(tong)。當壓(ya)縮(suo)(suo)機工作(zuo)時(shi)，壓(ya)縮(suo)(suo)機吸入(ru)從蒸(zheng)發(fa)器(qi)出來的低溫低壓(ya)的氣(qi)(qi)(qi)(qi)(qi)態制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)(ji)，經壓(ya)縮(suo)(suo)，制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)(ji)的溫度(du)(du)和(he)壓(ya)力升(sheng)高(gao)(gao)，并被送入(ru)冷(leng)(leng)(leng)凝(ning)器(qi)。在(zai)冷(leng)(leng)(leng)凝(ning)器(qi)內(nei)(nei)(nei)，高(gao)(gao)溫高(gao)(gao)壓(ya)的氣(qi)(qi)(qi)(qi)(qi)態制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)(ji)把熱量(liang)(liang)(liang)傳(chuan)遞給經過(guo)冷(leng)(leng)(leng)凝(ning)器(qi)的車外(wai)(wai)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)而液(ye)化，變成液(ye)體。液(ye)態制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)(ji)流(liu)經節流(liu)裝(zhuang)置時(shi)，溫度(du)(du)和(he)壓(ya)力降(jiang)低，并進(jin)(jin)入(ru)蒸(zheng)發(fa)器(qi)。在(zai)蒸(zheng)發(fa)器(qi)內(nei)(nei)(nei)，低溫低壓(ya)的液(ye)態制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)(ji)吸收經過(guo)蒸(zheng)發(fa)器(qi)的車內(nei)(nei)(nei)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)的熱量(liang)(liang)(liang)而蒸(zheng)發(fa)，變成氣(qi)(qi)(qi)(qi)(qi)體。氣(qi)(qi)(qi)(qi)(qi)體又(you)被壓(ya)縮(suo)(suo)機吸入(ru)進(jin)(jin)行下一(yi)輪循(xun)環(huan)(huan)(huan)(huan)。這樣，通過(guo)制(zhi)冷(leng)(leng)(leng)劑(ji)(ji)(ji)在(zai)系統(tong)內(nei)(nei)(nei)的循(xun)環(huan)(huan)(huan)(huan)，不斷吸收車內(nei)(nei)(nei)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)的熱量(liang)(liang)(liang)并排到車外(wai)(wai)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)中，使(shi)(shi)車內(nei)(nei)(nei)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)的溫度(du)(du)逐漸下降(jiang)。內(nei)(nei)(nei)循(xun)環(huan)(huan)(huan)(huan)可(ke)(ke)以提高(gao)(gao)空(kong)(kong)(kong)調(diao)效果，相(xiang)當于把室內(nei)(nei)(nei)冷(leng)(leng)(leng)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)再制(zhi)冷(leng)(leng)(leng)，空(kong)(kong)(kong)調(diao)效果當然更好了。不過(guo)長時(shi)間(jian)使(shi)(shi)用內(nei)(nei)(nei)循(xun)環(huan)(huan)(huan)(huan)會使(shi)(shi)車內(nei)(nei)(nei)的空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)質量(liang)(liang)(liang)降(jiang)低，可(ke)(ke)能讓(rang)人感(gan)覺頭昏腦漲。應當開(kai)一(yi)會兒內(nei)(nei)(nei)循(xun)環(huan)(huan)(huan)(huan)就使(shi)(shi)用幾分(fen)鐘外(wai)(wai)循(xun)環(huan)(huan)(huan)(huan)，讓(rang)新鮮空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)進(jin)(jin)入(ru)車內(nei)(nei)(nei)，改善空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)質量(liang)(liang)(liang)。如果空(kong)(kong)(kong)調(diao)內(nei)(nei)(nei)外(wai)(wai)循(xun)環(huan)(huan)(huan)(huan)開(kai)關是機械式的撥桿而非(fei)按(an)鈕(niu)，可(ke)(ke)以把撥桿放在(zai)內(nei)(nei)(nei)外(wai)(wai)循(xun)環(huan)(huan)(huan)(huan)的中間(jian)，讓(rang)車外(wai)(wai)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)適量(liang)(liang)(liang)進(jin)(jin)入(ru)，既能提升(sheng)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)(qi)質量(liang)(liang)(liang)，又(you)能提高(gao)(gao)空(kong)(kong)(kong)調(diao)效果。此外(wai)(wai)，在(zai)使(shi)(shi)用空(kong)(kong)(kong)調(diao)除霜除霧時(shi)，要使(shi)(shi)用外(wai)(wai)循(xun)環(huan)(huan)(huan)(huan)才有效。