大連車載空調由壓(ya)(ya)(ya)(ya)縮機、冷(leng)(leng)(leng)凝(ning)器(qi)(qi)、節(jie)流(liu)元件、蒸(zheng)發(fa)(fa)器(qi)(qi)、風機及必要的(de)(de)(de)(de)控(kong)制(zhi)(zhi)(zhi)部件構成(cheng)，用(yong)于調(diao)(diao)(diao)節(jie)車(che)內(nei)溫(wen)(wen)(wen)度(du)、濕(shi)度(du)，給(gei)乘員提(ti)供舒適(shi)環境的(de)(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)系統。當(dang)壓(ya)(ya)(ya)(ya)縮機工作(zuo)時(shi)(shi)，壓(ya)(ya)(ya)(ya)縮機吸(xi)入從(cong)蒸(zheng)發(fa)(fa)器(qi)(qi)出(chu)來的(de)(de)(de)(de)低(di)溫(wen)(wen)(wen)低(di)壓(ya)(ya)(ya)(ya)的(de)(de)(de)(de)氣(qi)態制(zhi)(zhi)(zhi)冷(leng)(leng)(leng)劑，經(jing)壓(ya)(ya)(ya)(ya)縮，制(zhi)(zhi)(zhi)冷(leng)(leng)(leng)劑的(de)(de)(de)(de)溫(wen)(wen)(wen)度(du)和壓(ya)(ya)(ya)(ya)力(li)升高(gao)，并被送入冷(leng)(leng)(leng)凝(ning)器(qi)(qi)。在(zai)(zai)冷(leng)(leng)(leng)凝(ning)器(qi)(qi)內(nei)，高(gao)溫(wen)(wen)(wen)高(gao)壓(ya)(ya)(ya)(ya)的(de)(de)(de)(de)氣(qi)態制(zhi)(zhi)(zhi)冷(leng)(leng)(leng)劑把(ba)熱(re)(re)量(liang)傳遞給(gei)經(jing)過冷(leng)(leng)(leng)凝(ning)器(qi)(qi)的(de)(de)(de)(de)車(che)外(wai)(wai)(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)而(er)液化，變(bian)成(cheng)液體(ti)。液態制(zhi)(zhi)(zhi)冷(leng)(leng)(leng)劑流(liu)經(jing)節(jie)流(liu)裝置時(shi)(shi)，溫(wen)(wen)(wen)度(du)和壓(ya)(ya)(ya)(ya)力(li)降低(di)，并進入蒸(zheng)發(fa)(fa)器(qi)(qi)。在(zai)(zai)蒸(zheng)發(fa)(fa)器(qi)(qi)內(nei)，低(di)溫(wen)(wen)(wen)低(di)壓(ya)(ya)(ya)(ya)的(de)(de)(de)(de)液態制(zhi)(zhi)(zhi)冷(leng)(leng)(leng)劑吸(xi)收經(jing)過蒸(zheng)發(fa)(fa)器(qi)(qi)的(de)(de)(de)(de)車(che)內(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)的(de)(de)(de)(de)熱(re)(re)量(liang)而(er)蒸(zheng)發(fa)(fa)，變(bian)成(cheng)氣(qi)體(ti)。氣(qi)體(ti)又被壓(ya)(ya)(ya)(ya)縮機吸(xi)入進行下一輪循環。這樣(yang)，通過制(zhi)(zhi)(zhi)冷(leng)(leng)(leng)劑在(zai)(zai)系統內(nei)的(de)(de)(de)(de)循環，不斷(duan)吸(xi)收車(che)內(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)的(de)(de)(de)(de)熱(re)(re)量(liang)并排到車(che)外(wai)(wai)(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)中(zhong)，使(shi)(shi)(shi)車(che)內(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)的(de)(de)(de)(de)溫(wen)(wen)(wen)度(du)逐漸下降。內(nei)循環可以提(ti)高(gao)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)(guo)(guo)，相當(dang)于把(ba)室內(nei)冷(leng)(leng)(leng)空(kong)(kong)(kong)(kong)(kong)氣(qi)再制(zhi)(zhi)(zhi)冷(leng)(leng)(leng)，空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)(guo)(guo)當(dang)然更好了。不過長時(shi)(shi)間(jian)(jian)使(shi)(shi)(shi)用(yong)內(nei)循環會(hui)使(shi)(shi)(shi)車(che)內(nei)的(de)(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)氣(qi)質(zhi)量(liang)降低(di)，可能(neng)讓(rang)人感覺頭昏(hun)腦漲。應當(dang)開(kai)一會(hui)兒內(nei)循環就使(shi)(shi)(shi)用(yong)幾(ji)分鐘(zhong)外(wai)(wai)(wai)循環，讓(rang)新(xin)鮮空(kong)(kong)(kong)(kong)(kong)氣(qi)進入車(che)內(nei)，改善空(kong)(kong)(kong)(kong)(kong)氣(qi)質(zhi)量(liang)。如果(guo)(guo)(guo)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)內(nei)外(wai)(wai)(wai)循環開(kai)關是(shi)機械式的(de)(de)(de)(de)撥桿(gan)而(er)非按鈕，可以把(ba)撥桿(gan)放(fang)在(zai)(zai)內(nei)外(wai)(wai)(wai)循環的(de)(de)(de)(de)中(zhong)間(jian)(jian)，讓(rang)車(che)外(wai)(wai)(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)適(shi)量(liang)進入，既能(neng)提(ti)升空(kong)(kong)(kong)(kong)(kong)氣(qi)質(zhi)量(liang)，又能(neng)提(ti)高(gao)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)(guo)(guo)。此外(wai)(wai)(wai)，在(zai)(zai)使(shi)(shi)(shi)用(yong)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)除(chu)霜除(chu)霧時(shi)(shi)，要使(shi)(shi)(shi)用(yong)外(wai)(wai)(wai)循環才有效。