大連車載空調由壓(ya)縮(suo)機、冷(leng)凝器、節(jie)流(liu)元件(jian)、蒸發器、風機及必(bi)要的(de)(de)控制(zhi)(zhi)(zhi)部件(jian)構(gou)成，用(yong)于調(diao)(diao)節(jie)車內(nei)(nei)溫(wen)(wen)度(du)(du)、濕度(du)(du)，給(gei)乘員提供舒適環(huan)(huan)(huan)境的(de)(de)空(kong)(kong)(kong)(kong)調(diao)(diao)系統(tong)。當(dang)壓(ya)縮(suo)機工作(zuo)時(shi)，壓(ya)縮(suo)機吸(xi)(xi)入從蒸發器出來(lai)的(de)(de)低(di)溫(wen)(wen)低(di)壓(ya)的(de)(de)氣(qi)(qi)態(tai)制(zhi)(zhi)(zhi)冷(leng)劑，經(jing)壓(ya)縮(suo)，制(zhi)(zhi)(zhi)冷(leng)劑的(de)(de)溫(wen)(wen)度(du)(du)和壓(ya)力升高，并(bing)被(bei)送入冷(leng)凝器。在(zai)(zai)冷(leng)凝器內(nei)(nei)，高溫(wen)(wen)高壓(ya)的(de)(de)氣(qi)(qi)態(tai)制(zhi)(zhi)(zhi)冷(leng)劑把熱量傳遞給(gei)經(jing)過(guo)冷(leng)凝器的(de)(de)車外(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)而液(ye)化，變成液(ye)體(ti)。液(ye)態(tai)制(zhi)(zhi)(zhi)冷(leng)劑流(liu)經(jing)節(jie)流(liu)裝(zhuang)置(zhi)時(shi)，溫(wen)(wen)度(du)(du)和壓(ya)力降(jiang)低(di)，并(bing)進入蒸發器。在(zai)(zai)蒸發器內(nei)(nei)，低(di)溫(wen)(wen)低(di)壓(ya)的(de)(de)液(ye)態(tai)制(zhi)(zhi)(zhi)冷(leng)劑吸(xi)(xi)收(shou)經(jing)過(guo)蒸發器的(de)(de)車內(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)熱量而蒸發，變成氣(qi)(qi)體(ti)。氣(qi)(qi)體(ti)又被(bei)壓(ya)縮(suo)機吸(xi)(xi)入進行(xing)下(xia)一(yi)輪循(xun)(xun)(xun)環(huan)(huan)(huan)。這樣，通過(guo)制(zhi)(zhi)(zhi)冷(leng)劑在(zai)(zai)系統(tong)內(nei)(nei)的(de)(de)循(xun)(xun)(xun)環(huan)(huan)(huan)，不斷吸(xi)(xi)收(shou)車內(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)熱量并(bing)排到車外(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)中，使車內(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)溫(wen)(wen)度(du)(du)逐漸(jian)下(xia)降(jiang)。內(nei)(nei)循(xun)(xun)(xun)環(huan)(huan)(huan)可(ke)以提高空(kong)(kong)(kong)(kong)調(diao)(diao)效(xiao)(xiao)果，相(xiang)當(dang)于把室(shi)內(nei)(nei)冷(leng)空(kong)(kong)(kong)(kong)氣(qi)(qi)再(zai)制(zhi)(zhi)(zhi)冷(leng)，空(kong)(kong)(kong)(kong)調(diao)(diao)效(xiao)(xiao)果當(dang)然更好了(le)。不過(guo)長時(shi)間使用(yong)內(nei)(nei)循(xun)(xun)(xun)環(huan)(huan)(huan)會使車內(nei)(nei)的(de)(de)空(kong)(kong)(kong)(kong)氣(qi)(qi)質量降(jiang)低(di)，可(ke)能讓人感覺頭昏腦漲。應(ying)當(dang)開(kai)(kai)一(yi)會兒內(nei)(nei)循(xun)(xun)(xun)環(huan)(huan)(huan)就使用(yong)幾分鐘外(wai)循(xun)(xun)(xun)環(huan)(huan)(huan)，讓新(xin)鮮(xian)空(kong)(kong)(kong)(kong)氣(qi)(qi)進入車內(nei)(nei)，改善(shan)空(kong)(kong)(kong)(kong)氣(qi)(qi)質量。如(ru)果空(kong)(kong)(kong)(kong)調(diao)(diao)內(nei)(nei)外(wai)循(xun)(xun)(xun)環(huan)(huan)(huan)開(kai)(kai)關是機械(xie)式的(de)(de)撥桿而非(fei)按(an)鈕，可(ke)以把撥桿放(fang)在(zai)(zai)內(nei)(nei)外(wai)循(xun)(xun)(xun)環(huan)(huan)(huan)的(de)(de)中間，讓車外(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)適量進入，既(ji)能提升空(kong)(kong)(kong)(kong)氣(qi)(qi)質量，又能提高空(kong)(kong)(kong)(kong)調(diao)(diao)效(xiao)(xiao)果。此外(wai)，在(zai)(zai)使用(yong)空(kong)(kong)(kong)(kong)調(diao)(diao)除霜(shuang)除霧時(shi)，要使用(yong)外(wai)循(xun)(xun)(xun)環(huan)(huan)(huan)才(cai)有效(xiao)(xiao)。