大連車載空調由壓(ya)縮(suo)機、冷凝(ning)器(qi)(qi)(qi)、節(jie)流(liu)元(yuan)件(jian)、蒸(zheng)發(fa)器(qi)(qi)(qi)、風(feng)機及必要(yao)的(de)(de)控制(zhi)部件(jian)構(gou)成，用(yong)于(yu)調(diao)(diao)(diao)節(jie)車(che)(che)(che)內(nei)(nei)溫(wen)度、濕度，給乘員提(ti)供舒適環(huan)境(jing)的(de)(de)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)系統。當壓(ya)縮(suo)機工作時(shi)(shi)，壓(ya)縮(suo)機吸(xi)入從(cong)蒸(zheng)發(fa)器(qi)(qi)(qi)出來(lai)的(de)(de)低(di)溫(wen)低(di)壓(ya)的(de)(de)氣(qi)(qi)(qi)態制(zhi)冷劑(ji)，經壓(ya)縮(suo)，制(zhi)冷劑(ji)的(de)(de)溫(wen)度和壓(ya)力升(sheng)高(gao)，并(bing)(bing)被(bei)送入冷凝(ning)器(qi)(qi)(qi)。在(zai)(zai)冷凝(ning)器(qi)(qi)(qi)內(nei)(nei)，高(gao)溫(wen)高(gao)壓(ya)的(de)(de)氣(qi)(qi)(qi)態制(zhi)冷劑(ji)把熱(re)量(liang)傳遞給經過(guo)(guo)冷凝(ning)器(qi)(qi)(qi)的(de)(de)車(che)(che)(che)外(wai)(wai)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)而液(ye)化(hua)，變成液(ye)體。液(ye)態制(zhi)冷劑(ji)流(liu)經節(jie)流(liu)裝置(zhi)時(shi)(shi)，溫(wen)度和壓(ya)力降低(di)，并(bing)(bing)進(jin)(jin)入蒸(zheng)發(fa)器(qi)(qi)(qi)。在(zai)(zai)蒸(zheng)發(fa)器(qi)(qi)(qi)內(nei)(nei)，低(di)溫(wen)低(di)壓(ya)的(de)(de)液(ye)態制(zhi)冷劑(ji)吸(xi)收經過(guo)(guo)蒸(zheng)發(fa)器(qi)(qi)(qi)的(de)(de)車(che)(che)(che)內(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)熱(re)量(liang)而蒸(zheng)發(fa)，變成氣(qi)(qi)(qi)體。氣(qi)(qi)(qi)體又被(bei)壓(ya)縮(suo)機吸(xi)入進(jin)(jin)行(xing)下一輪循(xun)(xun)環(huan)。這樣，通過(guo)(guo)制(zhi)冷劑(ji)在(zai)(zai)系統內(nei)(nei)的(de)(de)循(xun)(xun)環(huan)，不斷(duan)吸(xi)收車(che)(che)(che)內(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)熱(re)量(liang)并(bing)(bing)排到車(che)(che)(che)外(wai)(wai)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)中，使車(che)(che)(che)內(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)溫(wen)度逐漸下降。內(nei)(nei)循(xun)(xun)環(huan)可以提(ti)高(gao)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)果，相當于(yu)把室內(nei)(nei)冷空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)再制(zhi)冷，空(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)果當然更好了(le)。不過(guo)(guo)長時(shi)(shi)間使用(yong)內(nei)(nei)循(xun)(xun)環(huan)會使車(che)(che)(che)內(nei)(nei)的(de)(de)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質(zhi)量(liang)降低(di)，可能讓人(ren)感覺(jue)頭昏腦漲。應當開(kai)一會兒內(nei)(nei)循(xun)(xun)環(huan)就使用(yong)幾分(fen)鐘外(wai)(wai)循(xun)(xun)環(huan)，讓新鮮空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)進(jin)(jin)入車(che)(che)(che)內(nei)(nei)，改善空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質(zhi)量(liang)。如果空(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)內(nei)(nei)外(wai)(wai)循(xun)(xun)環(huan)開(kai)關是機械式的(de)(de)撥桿而非(fei)按鈕，可以把撥桿放在(zai)(zai)內(nei)(nei)外(wai)(wai)循(xun)(xun)環(huan)的(de)(de)中間，讓車(che)(che)(che)外(wai)(wai)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)適量(liang)進(jin)(jin)入，既能提(ti)升(sheng)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質(zhi)量(liang)，又能提(ti)高(gao)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)果。此(ci)外(wai)(wai)，在(zai)(zai)使用(yong)空(kong)(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)除霜除霧時(shi)(shi)，要(yao)使用(yong)外(wai)(wai)循(xun)(xun)環(huan)才有效(xiao)。