大連車載空調由壓縮(suo)機(ji)、冷(leng)(leng)(leng)凝(ning)(ning)器(qi)、節流(liu)元件、蒸(zheng)發(fa)器(qi)、風機(ji)及必(bi)要(yao)的(de)控制部件構(gou)成(cheng)，用于調(diao)節車內(nei)(nei)(nei)溫(wen)度(du)、濕度(du)，給(gei)乘員提(ti)供舒適環(huan)(huan)境的(de)空(kong)(kong)(kong)(kong)(kong)調(diao)系統(tong)。當(dang)壓縮(suo)機(ji)工(gong)作時(shi)，壓縮(suo)機(ji)吸入(ru)從蒸(zheng)發(fa)器(qi)出來(lai)的(de)低溫(wen)低壓的(de)氣(qi)(qi)態制冷(leng)(leng)(leng)劑，經壓縮(suo)，制冷(leng)(leng)(leng)劑的(de)溫(wen)度(du)和壓力(li)升高，并被(bei)送入(ru)冷(leng)(leng)(leng)凝(ning)(ning)器(qi)。在(zai)冷(leng)(leng)(leng)凝(ning)(ning)器(qi)內(nei)(nei)(nei)，高溫(wen)高壓的(de)氣(qi)(qi)態制冷(leng)(leng)(leng)劑把(ba)(ba)熱量(liang)(liang)傳遞給(gei)經過冷(leng)(leng)(leng)凝(ning)(ning)器(qi)的(de)車外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)而液(ye)(ye)化(hua)，變成(cheng)液(ye)(ye)體。液(ye)(ye)態制冷(leng)(leng)(leng)劑流(liu)經節流(liu)裝置(zhi)時(shi)，溫(wen)度(du)和壓力(li)降(jiang)低，并進(jin)(jin)入(ru)蒸(zheng)發(fa)器(qi)。在(zai)蒸(zheng)發(fa)器(qi)內(nei)(nei)(nei)，低溫(wen)低壓的(de)液(ye)(ye)態制冷(leng)(leng)(leng)劑吸收(shou)經過蒸(zheng)發(fa)器(qi)的(de)車內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)熱量(liang)(liang)而蒸(zheng)發(fa)，變成(cheng)氣(qi)(qi)體。氣(qi)(qi)體又被(bei)壓縮(suo)機(ji)吸入(ru)進(jin)(jin)行下一輪循(xun)(xun)環(huan)(huan)。這(zhe)樣，通(tong)過制冷(leng)(leng)(leng)劑在(zai)系統(tong)內(nei)(nei)(nei)的(de)循(xun)(xun)環(huan)(huan)，不斷吸收(shou)車內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)熱量(liang)(liang)并排到車外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)中，使(shi)車內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)溫(wen)度(du)逐漸下降(jiang)。內(nei)(nei)(nei)循(xun)(xun)環(huan)(huan)可(ke)以提(ti)高空(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果，相當(dang)于把(ba)(ba)室(shi)內(nei)(nei)(nei)冷(leng)(leng)(leng)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)再制冷(leng)(leng)(leng)，空(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果當(dang)然更好了。不過長時(shi)間使(shi)用內(nei)(nei)(nei)循(xun)(xun)環(huan)(huan)會(hui)使(shi)車內(nei)(nei)(nei)的(de)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)質(zhi)(zhi)量(liang)(liang)降(jiang)低，可(ke)能(neng)讓人(ren)感覺頭昏腦漲。應當(dang)開一會(hui)兒內(nei)(nei)(nei)循(xun)(xun)環(huan)(huan)就使(shi)用幾(ji)分鐘外(wai)循(xun)(xun)環(huan)(huan)，讓新鮮空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)進(jin)(jin)入(ru)車內(nei)(nei)(nei)，改善空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)質(zhi)(zhi)量(liang)(liang)。如果空(kong)(kong)(kong)(kong)(kong)調(diao)內(nei)(nei)(nei)外(wai)循(xun)(xun)環(huan)(huan)開關是機(ji)械(xie)式的(de)撥桿(gan)而非按(an)鈕，可(ke)以把(ba)(ba)撥桿(gan)放(fang)在(zai)內(nei)(nei)(nei)外(wai)循(xun)(xun)環(huan)(huan)的(de)中間，讓車外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)適量(liang)(liang)進(jin)(jin)入(ru)，既能(neng)提(ti)升空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)質(zhi)(zhi)量(liang)(liang)，又能(neng)提(ti)高空(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果。此外(wai)，在(zai)使(shi)用空(kong)(kong)(kong)(kong)(kong)調(diao)除霜除霧時(shi)，要(yao)使(shi)用外(wai)循(xun)(xun)環(huan)(huan)才有效(xiao)。