大連車載空調由壓(ya)(ya)(ya)縮機、冷(leng)(leng)(leng)(leng)凝(ning)(ning)器(qi)、節流(liu)元件、蒸(zheng)(zheng)發(fa)器(qi)、風機及(ji)必要(yao)(yao)的(de)控(kong)制(zhi)(zhi)部件構成，用(yong)于調(diao)節車(che)(che)內(nei)(nei)(nei)溫(wen)度、濕度，給乘員(yuan)提(ti)供舒適環(huan)境的(de)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)系統。當(dang)(dang)壓(ya)(ya)(ya)縮機工作時，壓(ya)(ya)(ya)縮機吸入(ru)從蒸(zheng)(zheng)發(fa)器(qi)出(chu)來的(de)低(di)(di)溫(wen)低(di)(di)壓(ya)(ya)(ya)的(de)氣(qi)(qi)(qi)(qi)態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)(leng)(leng)劑，經壓(ya)(ya)(ya)縮，制(zhi)(zhi)冷(leng)(leng)(leng)(leng)劑的(de)溫(wen)度和壓(ya)(ya)(ya)力(li)升高(gao)(gao)(gao)(gao)，并(bing)被(bei)送入(ru)冷(leng)(leng)(leng)(leng)凝(ning)(ning)器(qi)。在(zai)(zai)(zai)冷(leng)(leng)(leng)(leng)凝(ning)(ning)器(qi)內(nei)(nei)(nei)，高(gao)(gao)(gao)(gao)溫(wen)高(gao)(gao)(gao)(gao)壓(ya)(ya)(ya)的(de)氣(qi)(qi)(qi)(qi)態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)(leng)(leng)劑把(ba)熱(re)量(liang)(liang)傳遞給經過冷(leng)(leng)(leng)(leng)凝(ning)(ning)器(qi)的(de)車(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)而(er)液化，變成液體(ti)。液態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)(leng)(leng)劑流(liu)經節流(liu)裝(zhuang)置時，溫(wen)度和壓(ya)(ya)(ya)力(li)降低(di)(di)，并(bing)進入(ru)蒸(zheng)(zheng)發(fa)器(qi)。在(zai)(zai)(zai)蒸(zheng)(zheng)發(fa)器(qi)內(nei)(nei)(nei)，低(di)(di)溫(wen)低(di)(di)壓(ya)(ya)(ya)的(de)液態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)(leng)(leng)劑吸收經過蒸(zheng)(zheng)發(fa)器(qi)的(de)車(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)熱(re)量(liang)(liang)而(er)蒸(zheng)(zheng)發(fa)，變成氣(qi)(qi)(qi)(qi)體(ti)。氣(qi)(qi)(qi)(qi)體(ti)又被(bei)壓(ya)(ya)(ya)縮機吸入(ru)進行(xing)下一(yi)輪循(xun)環(huan)。這樣，通過制(zhi)(zhi)冷(leng)(leng)(leng)(leng)劑在(zai)(zai)(zai)系統內(nei)(nei)(nei)的(de)循(xun)環(huan)，不(bu)斷吸收車(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)熱(re)量(liang)(liang)并(bing)排到車(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)中，使(shi)車(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)溫(wen)度逐漸下降。內(nei)(nei)(nei)循(xun)環(huan)可(ke)以提(ti)高(gao)(gao)(gao)(gao)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)效果，相當(dang)(dang)于把(ba)室(shi)內(nei)(nei)(nei)冷(leng)(leng)(leng)(leng)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)再制(zhi)(zhi)冷(leng)(leng)(leng)(leng)，空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)效果當(dang)(dang)然更好(hao)了(le)。不(bu)過長時間(jian)使(shi)用(yong)內(nei)(nei)(nei)循(xun)環(huan)會(hui)使(shi)車(che)(che)內(nei)(nei)(nei)的(de)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質量(liang)(liang)降低(di)(di)，可(ke)能(neng)(neng)讓人感覺頭昏腦(nao)漲(zhang)。應當(dang)(dang)開(kai)一(yi)會(hui)兒內(nei)(nei)(nei)循(xun)環(huan)就使(shi)用(yong)幾分鐘外(wai)循(xun)環(huan)，讓新鮮空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)進入(ru)車(che)(che)內(nei)(nei)(nei)，改善(shan)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質量(liang)(liang)。如果空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)內(nei)(nei)(nei)外(wai)循(xun)環(huan)開(kai)關是機械式的(de)撥桿而(er)非(fei)按鈕(niu)，可(ke)以把(ba)撥桿放在(zai)(zai)(zai)內(nei)(nei)(nei)外(wai)循(xun)環(huan)的(de)中間(jian)，讓車(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)適量(liang)(liang)進入(ru)，既能(neng)(neng)提(ti)升空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質量(liang)(liang)，又能(neng)(neng)提(ti)高(gao)(gao)(gao)(gao)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)效果。此外(wai)，在(zai)(zai)(zai)使(shi)用(yong)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)除霜除霧時，要(yao)(yao)使(shi)用(yong)外(wai)循(xun)環(huan)才有效。