大連車載空調由壓(ya)(ya)(ya)縮(suo)(suo)機(ji)(ji)、冷(leng)(leng)凝(ning)(ning)器(qi)、節流元件(jian)、蒸(zheng)(zheng)發(fa)器(qi)、風機(ji)(ji)及必要的(de)(de)控(kong)制(zhi)(zhi)(zhi)部件(jian)構(gou)成，用(yong)(yong)于調(diao)(diao)(diao)節車(che)(che)(che)內(nei)(nei)(nei)溫(wen)(wen)(wen)度(du)、濕度(du)，給乘(cheng)員提供舒適環(huan)(huan)(huan)(huan)境的(de)(de)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)系(xi)統。當壓(ya)(ya)(ya)縮(suo)(suo)機(ji)(ji)工作時，壓(ya)(ya)(ya)縮(suo)(suo)機(ji)(ji)吸(xi)入從(cong)蒸(zheng)(zheng)發(fa)器(qi)出來的(de)(de)低(di)(di)溫(wen)(wen)(wen)低(di)(di)壓(ya)(ya)(ya)的(de)(de)氣(qi)(qi)態(tai)制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)，經(jing)壓(ya)(ya)(ya)縮(suo)(suo)，制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)的(de)(de)溫(wen)(wen)(wen)度(du)和(he)(he)壓(ya)(ya)(ya)力(li)升高，并被送入冷(leng)(leng)凝(ning)(ning)器(qi)。在(zai)冷(leng)(leng)凝(ning)(ning)器(qi)內(nei)(nei)(nei)，高溫(wen)(wen)(wen)高壓(ya)(ya)(ya)的(de)(de)氣(qi)(qi)態(tai)制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)把(ba)熱量傳遞給經(jing)過冷(leng)(leng)凝(ning)(ning)器(qi)的(de)(de)車(che)(che)(che)外(wai)(wai)(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)而液(ye)(ye)化，變(bian)成液(ye)(ye)體(ti)。液(ye)(ye)態(tai)制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)流經(jing)節流裝(zhuang)置時，溫(wen)(wen)(wen)度(du)和(he)(he)壓(ya)(ya)(ya)力(li)降低(di)(di)，并進入蒸(zheng)(zheng)發(fa)器(qi)。在(zai)蒸(zheng)(zheng)發(fa)器(qi)內(nei)(nei)(nei)，低(di)(di)溫(wen)(wen)(wen)低(di)(di)壓(ya)(ya)(ya)的(de)(de)液(ye)(ye)態(tai)制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)吸(xi)收經(jing)過蒸(zheng)(zheng)發(fa)器(qi)的(de)(de)車(che)(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)熱量而蒸(zheng)(zheng)發(fa)，變(bian)成氣(qi)(qi)體(ti)。氣(qi)(qi)體(ti)又(you)被壓(ya)(ya)(ya)縮(suo)(suo)機(ji)(ji)吸(xi)入進行下一輪循(xun)(xun)環(huan)(huan)(huan)(huan)。這(zhe)樣，通過制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)在(zai)系(xi)統內(nei)(nei)(nei)的(de)(de)循(xun)(xun)環(huan)(huan)(huan)(huan)，不斷(duan)吸(xi)收車(che)(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)熱量并排到車(che)(che)(che)外(wai)(wai)(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)中，使車(che)(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)溫(wen)(wen)(wen)度(du)逐漸下降。內(nei)(nei)(nei)循(xun)(xun)環(huan)(huan)(huan)(huan)可以提高空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)，相當于把(ba)室內(nei)(nei)(nei)冷(leng)(leng)空(kong)(kong)(kong)(kong)氣(qi)(qi)再(zai)制(zhi)(zhi)(zhi)冷(leng)(leng)，空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)當然(ran)更好了。不過長時間使用(yong)(yong)內(nei)(nei)(nei)循(xun)(xun)環(huan)(huan)(huan)(huan)會(hui)使車(che)(che)(che)內(nei)(nei)(nei)的(de)(de)空(kong)(kong)(kong)(kong)氣(qi)(qi)質量降低(di)(di)，可能讓人感覺頭(tou)昏腦漲。應當開一會(hui)兒內(nei)(nei)(nei)循(xun)(xun)環(huan)(huan)(huan)(huan)就使用(yong)(yong)幾分(fen)鐘(zhong)外(wai)(wai)(wai)循(xun)(xun)環(huan)(huan)(huan)(huan)，讓新鮮空(kong)(kong)(kong)(kong)氣(qi)(qi)進入車(che)(che)(che)內(nei)(nei)(nei)，改善空(kong)(kong)(kong)(kong)氣(qi)(qi)質量。如果(guo)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)內(nei)(nei)(nei)外(wai)(wai)(wai)循(xun)(xun)環(huan)(huan)(huan)(huan)開關是機(ji)(ji)械式的(de)(de)撥桿(gan)而非按鈕，可以把(ba)撥桿(gan)放(fang)在(zai)內(nei)(nei)(nei)外(wai)(wai)(wai)循(xun)(xun)環(huan)(huan)(huan)(huan)的(de)(de)中間，讓車(che)(che)(che)外(wai)(wai)(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)適量進入，既能提升空(kong)(kong)(kong)(kong)氣(qi)(qi)質量，又(you)能提高空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)。此(ci)外(wai)(wai)(wai)，在(zai)使用(yong)(yong)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)除霜除霧時，要使用(yong)(yong)外(wai)(wai)(wai)循(xun)(xun)環(huan)(huan)(huan)(huan)才有效。