大連車載空調由壓(ya)(ya)(ya)縮(suo)機、冷(leng)凝(ning)器(qi)、節(jie)流(liu)(liu)元件、蒸(zheng)(zheng)(zheng)發器(qi)、風機及必要(yao)的(de)(de)(de)控(kong)制部件構成，用(yong)(yong)于調(diao)(diao)(diao)節(jie)車內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)溫(wen)度、濕度，給乘員提供舒適環(huan)(huan)(huan)境的(de)(de)(de)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)系(xi)統(tong)。當(dang)壓(ya)(ya)(ya)縮(suo)機工作時(shi)，壓(ya)(ya)(ya)縮(suo)機吸(xi)入從蒸(zheng)(zheng)(zheng)發器(qi)出來的(de)(de)(de)低(di)(di)(di)溫(wen)低(di)(di)(di)壓(ya)(ya)(ya)的(de)(de)(de)氣(qi)態(tai)制冷(leng)劑(ji)，經(jing)壓(ya)(ya)(ya)縮(suo)，制冷(leng)劑(ji)的(de)(de)(de)溫(wen)度和壓(ya)(ya)(ya)力升(sheng)高，并被(bei)送入冷(leng)凝(ning)器(qi)。在冷(leng)凝(ning)器(qi)內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)，高溫(wen)高壓(ya)(ya)(ya)的(de)(de)(de)氣(qi)態(tai)制冷(leng)劑(ji)把熱(re)量(liang)傳遞給經(jing)過(guo)冷(leng)凝(ning)器(qi)的(de)(de)(de)車外(wai)空(kong)(kong)(kong)(kong)氣(qi)而液(ye)化，變成液(ye)體(ti)。液(ye)態(tai)制冷(leng)劑(ji)流(liu)(liu)經(jing)節(jie)流(liu)(liu)裝置時(shi)，溫(wen)度和壓(ya)(ya)(ya)力降(jiang)低(di)(di)(di)，并進(jin)(jin)入蒸(zheng)(zheng)(zheng)發器(qi)。在蒸(zheng)(zheng)(zheng)發器(qi)內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)，低(di)(di)(di)溫(wen)低(di)(di)(di)壓(ya)(ya)(ya)的(de)(de)(de)液(ye)態(tai)制冷(leng)劑(ji)吸(xi)收(shou)經(jing)過(guo)蒸(zheng)(zheng)(zheng)發器(qi)的(de)(de)(de)車內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)的(de)(de)(de)熱(re)量(liang)而蒸(zheng)(zheng)(zheng)發，變成氣(qi)體(ti)。氣(qi)體(ti)又(you)被(bei)壓(ya)(ya)(ya)縮(suo)機吸(xi)入進(jin)(jin)行下(xia)一輪循(xun)環(huan)(huan)(huan)。這樣，通過(guo)制冷(leng)劑(ji)在系(xi)統(tong)內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)的(de)(de)(de)循(xun)環(huan)(huan)(huan)，不斷(duan)吸(xi)收(shou)車內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)的(de)(de)(de)熱(re)量(liang)并排到車外(wai)空(kong)(kong)(kong)(kong)氣(qi)中，使(shi)車內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)的(de)(de)(de)溫(wen)度逐(zhu)漸下(xia)降(jiang)。內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)循(xun)環(huan)(huan)(huan)可(ke)(ke)以提高空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)果，相當(dang)于把室(shi)內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)冷(leng)空(kong)(kong)(kong)(kong)氣(qi)再制冷(leng)，空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)果當(dang)然更(geng)好(hao)了。不過(guo)長時(shi)間使(shi)用(yong)(yong)內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)循(xun)環(huan)(huan)(huan)會使(shi)車內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)的(de)(de)(de)空(kong)(kong)(kong)(kong)氣(qi)質量(liang)降(jiang)低(di)(di)(di)，可(ke)(ke)能(neng)(neng)(neng)讓(rang)人(ren)感覺頭昏腦漲(zhang)。應(ying)當(dang)開一會兒內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)循(xun)環(huan)(huan)(huan)就使(shi)用(yong)(yong)幾分(fen)鐘外(wai)循(xun)環(huan)(huan)(huan)，讓(rang)新鮮空(kong)(kong)(kong)(kong)氣(qi)進(jin)(jin)入車內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)，改善(shan)空(kong)(kong)(kong)(kong)氣(qi)質量(liang)。如果空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)(huan)(huan)開關(guan)是(shi)機械式的(de)(de)(de)撥(bo)桿而非按鈕，可(ke)(ke)以把撥(bo)桿放(fang)在內(nei)(nei)(nei)(nei)(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)(huan)(huan)的(de)(de)(de)中間，讓(rang)車外(wai)空(kong)(kong)(kong)(kong)氣(qi)適量(liang)進(jin)(jin)入，既能(neng)(neng)(neng)提升(sheng)空(kong)(kong)(kong)(kong)氣(qi)質量(liang)，又(you)能(neng)(neng)(neng)提高空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)果。此外(wai)，在使(shi)用(yong)(yong)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)除霜除霧(wu)時(shi)，要(yao)使(shi)用(yong)(yong)外(wai)循(xun)環(huan)(huan)(huan)才(cai)有效(xiao)。