大連車載空調由(you)壓縮機(ji)(ji)、冷(leng)(leng)(leng)(leng)(leng)凝器(qi)、節流元件(jian)(jian)、蒸發(fa)器(qi)、風機(ji)(ji)及必要的(de)(de)(de)控制(zhi)(zhi)部件(jian)(jian)構成(cheng)，用(yong)(yong)于(yu)調(diao)(diao)(diao)節車(che)內(nei)(nei)(nei)(nei)溫(wen)度(du)、濕(shi)度(du)，給乘員提(ti)(ti)(ti)供舒適環(huan)境的(de)(de)(de)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)系統(tong)。當(dang)壓縮機(ji)(ji)工作時，壓縮機(ji)(ji)吸入從蒸發(fa)器(qi)出來(lai)的(de)(de)(de)低(di)溫(wen)低(di)壓的(de)(de)(de)氣(qi)(qi)態制(zhi)(zhi)冷(leng)(leng)(leng)(leng)(leng)劑(ji)，經(jing)(jing)壓縮，制(zhi)(zhi)冷(leng)(leng)(leng)(leng)(leng)劑(ji)的(de)(de)(de)溫(wen)度(du)和壓力(li)升高(gao)，并被(bei)送(song)入冷(leng)(leng)(leng)(leng)(leng)凝器(qi)。在(zai)冷(leng)(leng)(leng)(leng)(leng)凝器(qi)內(nei)(nei)(nei)(nei)，高(gao)溫(wen)高(gao)壓的(de)(de)(de)氣(qi)(qi)態制(zhi)(zhi)冷(leng)(leng)(leng)(leng)(leng)劑(ji)把熱量(liang)傳遞給經(jing)(jing)過(guo)冷(leng)(leng)(leng)(leng)(leng)凝器(qi)的(de)(de)(de)車(che)外(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)而(er)液(ye)(ye)化(hua)，變(bian)(bian)成(cheng)液(ye)(ye)體(ti)(ti)。液(ye)(ye)態制(zhi)(zhi)冷(leng)(leng)(leng)(leng)(leng)劑(ji)流經(jing)(jing)節流裝(zhuang)置(zhi)時，溫(wen)度(du)和壓力(li)降(jiang)低(di)，并進入蒸發(fa)器(qi)。在(zai)蒸發(fa)器(qi)內(nei)(nei)(nei)(nei)，低(di)溫(wen)低(di)壓的(de)(de)(de)液(ye)(ye)態制(zhi)(zhi)冷(leng)(leng)(leng)(leng)(leng)劑(ji)吸收(shou)經(jing)(jing)過(guo)蒸發(fa)器(qi)的(de)(de)(de)車(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)(de)熱量(liang)而(er)蒸發(fa)，變(bian)(bian)成(cheng)氣(qi)(qi)體(ti)(ti)。氣(qi)(qi)體(ti)(ti)又被(bei)壓縮機(ji)(ji)吸入進行下一輪循(xun)環(huan)。這樣，通過(guo)制(zhi)(zhi)冷(leng)(leng)(leng)(leng)(leng)劑(ji)在(zai)系統(tong)內(nei)(nei)(nei)(nei)的(de)(de)(de)循(xun)環(huan)，不斷吸收(shou)車(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)(de)熱量(liang)并排到車(che)外(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)中，使(shi)車(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)(de)溫(wen)度(du)逐漸下降(jiang)。內(nei)(nei)(nei)(nei)循(xun)環(huan)可(ke)(ke)以(yi)提(ti)(ti)(ti)高(gao)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)，相當(dang)于(yu)把室(shi)內(nei)(nei)(nei)(nei)冷(leng)(leng)(leng)(leng)(leng)空(kong)(kong)(kong)(kong)氣(qi)(qi)再制(zhi)(zhi)冷(leng)(leng)(leng)(leng)(leng)，空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)當(dang)然更好(hao)了。不過(guo)長時間使(shi)用(yong)(yong)內(nei)(nei)(nei)(nei)循(xun)環(huan)會使(shi)車(che)內(nei)(nei)(nei)(nei)的(de)(de)(de)空(kong)(kong)(kong)(kong)氣(qi)(qi)質量(liang)降(jiang)低(di)，可(ke)(ke)能讓(rang)(rang)人感覺頭昏腦漲。應當(dang)開一會兒內(nei)(nei)(nei)(nei)循(xun)環(huan)就使(shi)用(yong)(yong)幾分鐘外(wai)循(xun)環(huan)，讓(rang)(rang)新(xin)鮮空(kong)(kong)(kong)(kong)氣(qi)(qi)進入車(che)內(nei)(nei)(nei)(nei)，改善空(kong)(kong)(kong)(kong)氣(qi)(qi)質量(liang)。如果(guo)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)內(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)開關是(shi)機(ji)(ji)械式的(de)(de)(de)撥桿(gan)而(er)非按鈕，可(ke)(ke)以(yi)把撥桿(gan)放在(zai)內(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)的(de)(de)(de)中間，讓(rang)(rang)車(che)外(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)適量(liang)進入，既(ji)能提(ti)(ti)(ti)升空(kong)(kong)(kong)(kong)氣(qi)(qi)質量(liang)，又能提(ti)(ti)(ti)高(gao)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)。此外(wai)，在(zai)使(shi)用(yong)(yong)空(kong)(kong)(kong)(kong)調(diao)(diao)(diao)除霜(shuang)除霧時，要使(shi)用(yong)(yong)外(wai)循(xun)環(huan)才(cai)有效。