大連車載空調由壓縮(suo)機(ji)、冷(leng)(leng)凝器(qi)(qi)(qi)、節流元件(jian)、蒸(zheng)發(fa)(fa)(fa)器(qi)(qi)(qi)、風(feng)機(ji)及必要的(de)(de)(de)(de)控制(zhi)(zhi)部件(jian)構成，用(yong)于調(diao)節車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)溫度、濕(shi)度，給乘員提(ti)供舒適(shi)環(huan)(huan)境的(de)(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)系統(tong)。當壓縮(suo)機(ji)工作(zuo)時，壓縮(suo)機(ji)吸(xi)入(ru)從蒸(zheng)發(fa)(fa)(fa)器(qi)(qi)(qi)出來(lai)的(de)(de)(de)(de)低(di)溫低(di)壓的(de)(de)(de)(de)氣(qi)(qi)(qi)態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)劑(ji)，經壓縮(suo)，制(zhi)(zhi)冷(leng)(leng)劑(ji)的(de)(de)(de)(de)溫度和壓力升高，并被(bei)送入(ru)冷(leng)(leng)凝器(qi)(qi)(qi)。在(zai)冷(leng)(leng)凝器(qi)(qi)(qi)內(nei)(nei)(nei)(nei)(nei)，高溫高壓的(de)(de)(de)(de)氣(qi)(qi)(qi)態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)劑(ji)把熱(re)量傳(chuan)遞(di)給經過(guo)冷(leng)(leng)凝器(qi)(qi)(qi)的(de)(de)(de)(de)車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)而液(ye)化，變成液(ye)體(ti)(ti)。液(ye)態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)劑(ji)流經節流裝置時，溫度和壓力降(jiang)低(di)，并進(jin)入(ru)蒸(zheng)發(fa)(fa)(fa)器(qi)(qi)(qi)。在(zai)蒸(zheng)發(fa)(fa)(fa)器(qi)(qi)(qi)內(nei)(nei)(nei)(nei)(nei)，低(di)溫低(di)壓的(de)(de)(de)(de)液(ye)態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)劑(ji)吸(xi)收經過(guo)蒸(zheng)發(fa)(fa)(fa)器(qi)(qi)(qi)的(de)(de)(de)(de)車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)(de)熱(re)量而蒸(zheng)發(fa)(fa)(fa)，變成氣(qi)(qi)(qi)體(ti)(ti)。氣(qi)(qi)(qi)體(ti)(ti)又(you)被(bei)壓縮(suo)機(ji)吸(xi)入(ru)進(jin)行下一輪循(xun)環(huan)(huan)。這樣，通過(guo)制(zhi)(zhi)冷(leng)(leng)劑(ji)在(zai)系統(tong)內(nei)(nei)(nei)(nei)(nei)的(de)(de)(de)(de)循(xun)環(huan)(huan)，不斷(duan)吸(xi)收車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)(de)熱(re)量并排到車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)中，使車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)(de)溫度逐漸下降(jiang)。內(nei)(nei)(nei)(nei)(nei)循(xun)環(huan)(huan)可以(yi)提(ti)高空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)效果(guo)，相當于把室內(nei)(nei)(nei)(nei)(nei)冷(leng)(leng)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)再制(zhi)(zhi)冷(leng)(leng)，空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)效果(guo)當然更好了(le)。不過(guo)長時間使用(yong)內(nei)(nei)(nei)(nei)(nei)循(xun)環(huan)(huan)會(hui)使車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)的(de)(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量降(jiang)低(di)，可能(neng)(neng)讓人(ren)感覺頭昏腦漲。應(ying)當開(kai)一會(hui)兒內(nei)(nei)(nei)(nei)(nei)循(xun)環(huan)(huan)就使用(yong)幾(ji)分鐘外(wai)循(xun)環(huan)(huan)，讓新鮮空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)進(jin)入(ru)車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)，改善空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量。如果(guo)空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)內(nei)(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)(huan)開(kai)關是機(ji)械式的(de)(de)(de)(de)撥桿而非按鈕，可以(yi)把撥桿放(fang)在(zai)內(nei)(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)(huan)的(de)(de)(de)(de)中間，讓車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)適(shi)量進(jin)入(ru)，既能(neng)(neng)提(ti)升空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量，又(you)能(neng)(neng)提(ti)高空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)效果(guo)。此外(wai)，在(zai)使用(yong)空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)除霜除霧時，要使用(yong)外(wai)循(xun)環(huan)(huan)才(cai)有(you)效。