大連車載空調由壓(ya)(ya)縮(suo)(suo)機(ji)(ji)(ji)(ji)、冷(leng)凝器(qi)(qi)、節(jie)流(liu)元件(jian)、蒸發(fa)器(qi)(qi)、風機(ji)(ji)(ji)(ji)及必(bi)要的(de)(de)控制(zhi)(zhi)部件(jian)構成，用于(yu)(yu)調(diao)節(jie)車(che)內(nei)(nei)(nei)(nei)溫度(du)(du)(du)、濕(shi)度(du)(du)(du)，給乘員提供舒適(shi)環(huan)境的(de)(de)空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)系(xi)統。當壓(ya)(ya)縮(suo)(suo)機(ji)(ji)(ji)(ji)工作時，壓(ya)(ya)縮(suo)(suo)機(ji)(ji)(ji)(ji)吸(xi)(xi)入(ru)(ru)(ru)從蒸發(fa)器(qi)(qi)出來的(de)(de)低(di)(di)溫低(di)(di)壓(ya)(ya)的(de)(de)氣(qi)(qi)(qi)(qi)態(tai)(tai)制(zhi)(zhi)冷(leng)劑(ji)(ji)，經(jing)壓(ya)(ya)縮(suo)(suo)，制(zhi)(zhi)冷(leng)劑(ji)(ji)的(de)(de)溫度(du)(du)(du)和壓(ya)(ya)力(li)(li)升高(gao)(gao)，并被送(song)入(ru)(ru)(ru)冷(leng)凝器(qi)(qi)。在冷(leng)凝器(qi)(qi)內(nei)(nei)(nei)(nei)，高(gao)(gao)溫高(gao)(gao)壓(ya)(ya)的(de)(de)氣(qi)(qi)(qi)(qi)態(tai)(tai)制(zhi)(zhi)冷(leng)劑(ji)(ji)把熱(re)量(liang)傳(chuan)遞給經(jing)過(guo)冷(leng)凝器(qi)(qi)的(de)(de)車(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)而液(ye)化，變(bian)成液(ye)體。液(ye)態(tai)(tai)制(zhi)(zhi)冷(leng)劑(ji)(ji)流(liu)經(jing)節(jie)流(liu)裝(zhuang)置時，溫度(du)(du)(du)和壓(ya)(ya)力(li)(li)降(jiang)低(di)(di)，并進(jin)(jin)入(ru)(ru)(ru)蒸發(fa)器(qi)(qi)。在蒸發(fa)器(qi)(qi)內(nei)(nei)(nei)(nei)，低(di)(di)溫低(di)(di)壓(ya)(ya)的(de)(de)液(ye)態(tai)(tai)制(zhi)(zhi)冷(leng)劑(ji)(ji)吸(xi)(xi)收經(jing)過(guo)蒸發(fa)器(qi)(qi)的(de)(de)車(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)(de)熱(re)量(liang)而蒸發(fa)，變(bian)成氣(qi)(qi)(qi)(qi)體。氣(qi)(qi)(qi)(qi)體又(you)被壓(ya)(ya)縮(suo)(suo)機(ji)(ji)(ji)(ji)吸(xi)(xi)入(ru)(ru)(ru)進(jin)(jin)行下一(yi)輪循(xun)環(huan)。這樣，通(tong)過(guo)制(zhi)(zhi)冷(leng)劑(ji)(ji)在系(xi)統內(nei)(nei)(nei)(nei)的(de)(de)循(xun)環(huan)，不斷(duan)吸(xi)(xi)收車(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)(de)熱(re)量(liang)并排(pai)到車(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)中，使(shi)(shi)車(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)(de)溫度(du)(du)(du)逐漸(jian)下降(jiang)。內(nei)(nei)(nei)(nei)循(xun)環(huan)可以提高(gao)(gao)空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果，相當于(yu)(yu)把室內(nei)(nei)(nei)(nei)冷(leng)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)再制(zhi)(zhi)冷(leng)，空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果當然(ran)更(geng)好了(le)。不過(guo)長(chang)時間使(shi)(shi)用內(nei)(nei)(nei)(nei)循(xun)環(huan)會(hui)使(shi)(shi)車(che)內(nei)(nei)(nei)(nei)的(de)(de)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質量(liang)降(jiang)低(di)(di)，可能讓(rang)人感覺頭(tou)昏腦(nao)漲。應當開(kai)(kai)一(yi)會(hui)兒內(nei)(nei)(nei)(nei)循(xun)環(huan)就使(shi)(shi)用幾分鐘(zhong)外(wai)循(xun)環(huan)，讓(rang)新鮮空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)進(jin)(jin)入(ru)(ru)(ru)車(che)內(nei)(nei)(nei)(nei)，改善(shan)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質量(liang)。如果空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)內(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)開(kai)(kai)關是機(ji)(ji)(ji)(ji)械式的(de)(de)撥(bo)桿而非按鈕，可以把撥(bo)桿放(fang)在內(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)的(de)(de)中間，讓(rang)車(che)外(wai)空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)適(shi)量(liang)進(jin)(jin)入(ru)(ru)(ru)，既能提升空(kong)(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質量(liang)，又(you)能提高(gao)(gao)空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果。此(ci)外(wai)，在使(shi)(shi)用空(kong)(kong)(kong)(kong)(kong)(kong)調(diao)除霜(shuang)除霧時，要使(shi)(shi)用外(wai)循(xun)環(huan)才有效(xiao)。