大連車載空調由壓(ya)縮(suo)機、冷(leng)(leng)(leng)凝器(qi)(qi)、節流元件、蒸發(fa)(fa)器(qi)(qi)、風機及(ji)必要的(de)(de)(de)控制(zhi)部(bu)件構(gou)成，用(yong)(yong)(yong)于調(diao)節車(che)(che)內(nei)(nei)溫度、濕度，給乘(cheng)員提供舒適環(huan)(huan)(huan)境的(de)(de)(de)空(kong)(kong)(kong)(kong)調(diao)系統(tong)(tong)。當壓(ya)縮(suo)機工作(zuo)時(shi)(shi)(shi)，壓(ya)縮(suo)機吸入(ru)(ru)從蒸發(fa)(fa)器(qi)(qi)出來(lai)的(de)(de)(de)低溫低壓(ya)的(de)(de)(de)氣(qi)態制(zhi)冷(leng)(leng)(leng)劑(ji)，經壓(ya)縮(suo)，制(zhi)冷(leng)(leng)(leng)劑(ji)的(de)(de)(de)溫度和壓(ya)力升高，并(bing)被(bei)送入(ru)(ru)冷(leng)(leng)(leng)凝器(qi)(qi)。在(zai)(zai)冷(leng)(leng)(leng)凝器(qi)(qi)內(nei)(nei)，高溫高壓(ya)的(de)(de)(de)氣(qi)態制(zhi)冷(leng)(leng)(leng)劑(ji)把(ba)熱(re)(re)量(liang)(liang)(liang)傳遞給經過冷(leng)(leng)(leng)凝器(qi)(qi)的(de)(de)(de)車(che)(che)外(wai)空(kong)(kong)(kong)(kong)氣(qi)而液化，變(bian)成液體(ti)。液態制(zhi)冷(leng)(leng)(leng)劑(ji)流經節流裝置時(shi)(shi)(shi)，溫度和壓(ya)力降(jiang)低，并(bing)進入(ru)(ru)蒸發(fa)(fa)器(qi)(qi)。在(zai)(zai)蒸發(fa)(fa)器(qi)(qi)內(nei)(nei)，低溫低壓(ya)的(de)(de)(de)液態制(zhi)冷(leng)(leng)(leng)劑(ji)吸收經過蒸發(fa)(fa)器(qi)(qi)的(de)(de)(de)車(che)(che)內(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)的(de)(de)(de)熱(re)(re)量(liang)(liang)(liang)而蒸發(fa)(fa)，變(bian)成氣(qi)體(ti)。氣(qi)體(ti)又(you)被(bei)壓(ya)縮(suo)機吸入(ru)(ru)進行下(xia)一(yi)輪循環(huan)(huan)(huan)。這樣，通過制(zhi)冷(leng)(leng)(leng)劑(ji)在(zai)(zai)系統(tong)(tong)內(nei)(nei)的(de)(de)(de)循環(huan)(huan)(huan)，不(bu)斷吸收車(che)(che)內(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)的(de)(de)(de)熱(re)(re)量(liang)(liang)(liang)并(bing)排(pai)到(dao)車(che)(che)外(wai)空(kong)(kong)(kong)(kong)氣(qi)中，使車(che)(che)內(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)的(de)(de)(de)溫度逐(zhu)漸下(xia)降(jiang)。內(nei)(nei)循環(huan)(huan)(huan)可以提高空(kong)(kong)(kong)(kong)調(diao)效果，相當于把(ba)室內(nei)(nei)冷(leng)(leng)(leng)空(kong)(kong)(kong)(kong)氣(qi)再(zai)制(zhi)冷(leng)(leng)(leng)，空(kong)(kong)(kong)(kong)調(diao)效果當然(ran)更好了。不(bu)過長時(shi)(shi)(shi)間使用(yong)(yong)(yong)內(nei)(nei)循環(huan)(huan)(huan)會(hui)使車(che)(che)內(nei)(nei)的(de)(de)(de)空(kong)(kong)(kong)(kong)氣(qi)質量(liang)(liang)(liang)降(jiang)低，可能(neng)讓人(ren)感覺頭(tou)昏腦漲。應(ying)當開一(yi)會(hui)兒(er)內(nei)(nei)循環(huan)(huan)(huan)就使用(yong)(yong)(yong)幾分鐘外(wai)循環(huan)(huan)(huan)，讓新(xin)鮮(xian)空(kong)(kong)(kong)(kong)氣(qi)進入(ru)(ru)車(che)(che)內(nei)(nei)，改善空(kong)(kong)(kong)(kong)氣(qi)質量(liang)(liang)(liang)。如果空(kong)(kong)(kong)(kong)調(diao)內(nei)(nei)外(wai)循環(huan)(huan)(huan)開關(guan)是機械式的(de)(de)(de)撥桿而非按鈕(niu)，可以把(ba)撥桿放在(zai)(zai)內(nei)(nei)外(wai)循環(huan)(huan)(huan)的(de)(de)(de)中間，讓車(che)(che)外(wai)空(kong)(kong)(kong)(kong)氣(qi)適量(liang)(liang)(liang)進入(ru)(ru)，既能(neng)提升空(kong)(kong)(kong)(kong)氣(qi)質量(liang)(liang)(liang)，又(you)能(neng)提高空(kong)(kong)(kong)(kong)調(diao)效果。此外(wai)，在(zai)(zai)使用(yong)(yong)(yong)空(kong)(kong)(kong)(kong)調(diao)除霜除霧時(shi)(shi)(shi)，要使用(yong)(yong)(yong)外(wai)循環(huan)(huan)(huan)才有(you)效。