大連車載空調由壓(ya)(ya)(ya)縮(suo)機、冷(leng)(leng)(leng)(leng)(leng)凝(ning)器(qi)(qi)、節流元件、蒸(zheng)發(fa)器(qi)(qi)、風機及必要(yao)的(de)(de)控制部件構成，用于調(diao)(diao)(diao)節車(che)內(nei)溫(wen)(wen)度、濕度，給(gei)乘員提(ti)供舒(shu)適環(huan)境的(de)(de)空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)系(xi)統(tong)。當(dang)壓(ya)(ya)(ya)縮(suo)機工作時，壓(ya)(ya)(ya)縮(suo)機吸(xi)入(ru)從蒸(zheng)發(fa)器(qi)(qi)出來的(de)(de)低(di)溫(wen)(wen)低(di)壓(ya)(ya)(ya)的(de)(de)氣(qi)態制冷(leng)(leng)(leng)(leng)(leng)劑(ji)，經(jing)壓(ya)(ya)(ya)縮(suo)，制冷(leng)(leng)(leng)(leng)(leng)劑(ji)的(de)(de)溫(wen)(wen)度和壓(ya)(ya)(ya)力(li)升高(gao)，并被送入(ru)冷(leng)(leng)(leng)(leng)(leng)凝(ning)器(qi)(qi)。在冷(leng)(leng)(leng)(leng)(leng)凝(ning)器(qi)(qi)內(nei)，高(gao)溫(wen)(wen)高(gao)壓(ya)(ya)(ya)的(de)(de)氣(qi)態制冷(leng)(leng)(leng)(leng)(leng)劑(ji)把(ba)熱量(liang)(liang)(liang)傳遞給(gei)經(jing)過冷(leng)(leng)(leng)(leng)(leng)凝(ning)器(qi)(qi)的(de)(de)車(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)而液化(hua)，變成液體。液態制冷(leng)(leng)(leng)(leng)(leng)劑(ji)流經(jing)節流裝置時，溫(wen)(wen)度和壓(ya)(ya)(ya)力(li)降低(di)，并進入(ru)蒸(zheng)發(fa)器(qi)(qi)。在蒸(zheng)發(fa)器(qi)(qi)內(nei)，低(di)溫(wen)(wen)低(di)壓(ya)(ya)(ya)的(de)(de)液態制冷(leng)(leng)(leng)(leng)(leng)劑(ji)吸(xi)收經(jing)過蒸(zheng)發(fa)器(qi)(qi)的(de)(de)車(che)內(nei)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)的(de)(de)熱量(liang)(liang)(liang)而蒸(zheng)發(fa)，變成氣(qi)體。氣(qi)體又被壓(ya)(ya)(ya)縮(suo)機吸(xi)入(ru)進行下一輪循(xun)環(huan)。這(zhe)樣，通過制冷(leng)(leng)(leng)(leng)(leng)劑(ji)在系(xi)統(tong)內(nei)的(de)(de)循(xun)環(huan)，不斷吸(xi)收車(che)內(nei)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)的(de)(de)熱量(liang)(liang)(liang)并排(pai)到車(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)中(zhong)，使(shi)(shi)車(che)內(nei)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)的(de)(de)溫(wen)(wen)度逐漸下降。內(nei)循(xun)環(huan)可以(yi)(yi)提(ti)高(gao)空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)(xiao)果(guo)(guo)，相當(dang)于把(ba)室內(nei)冷(leng)(leng)(leng)(leng)(leng)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)再(zai)制冷(leng)(leng)(leng)(leng)(leng)，空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)(xiao)果(guo)(guo)當(dang)然更好了(le)。不過長時間(jian)使(shi)(shi)用內(nei)循(xun)環(huan)會使(shi)(shi)車(che)內(nei)的(de)(de)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)質(zhi)量(liang)(liang)(liang)降低(di)，可能(neng)讓(rang)(rang)人感覺頭昏(hun)腦(nao)漲。應(ying)當(dang)開一會兒(er)內(nei)循(xun)環(huan)就使(shi)(shi)用幾分鐘外(wai)循(xun)環(huan)，讓(rang)(rang)新鮮(xian)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)進入(ru)車(che)內(nei)，改善空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)質(zhi)量(liang)(liang)(liang)。如果(guo)(guo)空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)內(nei)外(wai)循(xun)環(huan)開關是機械式(shi)的(de)(de)撥(bo)桿(gan)而非按鈕，可以(yi)(yi)把(ba)撥(bo)桿(gan)放在內(nei)外(wai)循(xun)環(huan)的(de)(de)中(zhong)間(jian)，讓(rang)(rang)車(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)適量(liang)(liang)(liang)進入(ru)，既能(neng)提(ti)升空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)質(zhi)量(liang)(liang)(liang)，又能(neng)提(ti)高(gao)空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)(xiao)果(guo)(guo)。此外(wai)，在使(shi)(shi)用空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)除(chu)霜(shuang)除(chu)霧時，要(yao)使(shi)(shi)用外(wai)循(xun)環(huan)才有效(xiao)(xiao)。