大連車載空調由壓縮(suo)機、冷(leng)(leng)(leng)凝器(qi)、節(jie)流元件、蒸發(fa)器(qi)、風機及(ji)必要的(de)(de)(de)控制(zhi)(zhi)部件構成(cheng)，用(yong)(yong)于(yu)(yu)調(diao)(diao)節(jie)車(che)(che)內(nei)(nei)(nei)溫(wen)度(du)、濕度(du)，給(gei)(gei)乘員(yuan)提(ti)供(gong)舒適環(huan)(huan)境的(de)(de)(de)空(kong)(kong)(kong)調(diao)(diao)系統(tong)。當(dang)壓縮(suo)機工作時(shi)，壓縮(suo)機吸入(ru)從蒸發(fa)器(qi)出來的(de)(de)(de)低溫(wen)低壓的(de)(de)(de)氣(qi)(qi)(qi)(qi)態制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)，經(jing)壓縮(suo)，制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)的(de)(de)(de)溫(wen)度(du)和壓力升高(gao)，并被送(song)入(ru)冷(leng)(leng)(leng)凝器(qi)。在(zai)冷(leng)(leng)(leng)凝器(qi)內(nei)(nei)(nei)，高(gao)溫(wen)高(gao)壓的(de)(de)(de)氣(qi)(qi)(qi)(qi)態制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)把(ba)熱量(liang)(liang)傳遞給(gei)(gei)經(jing)過冷(leng)(leng)(leng)凝器(qi)的(de)(de)(de)車(che)(che)外(wai)(wai)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)而(er)液(ye)化，變成(cheng)液(ye)體。液(ye)態制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)流經(jing)節(jie)流裝置時(shi)，溫(wen)度(du)和壓力降低，并進(jin)入(ru)蒸發(fa)器(qi)。在(zai)蒸發(fa)器(qi)內(nei)(nei)(nei)，低溫(wen)低壓的(de)(de)(de)液(ye)態制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)吸收經(jing)過蒸發(fa)器(qi)的(de)(de)(de)車(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)(de)(de)熱量(liang)(liang)而(er)蒸發(fa)，變成(cheng)氣(qi)(qi)(qi)(qi)體。氣(qi)(qi)(qi)(qi)體又被壓縮(suo)機吸入(ru)進(jin)行下(xia)一(yi)輪循(xun)(xun)(xun)環(huan)(huan)。這樣，通過制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)在(zai)系統(tong)內(nei)(nei)(nei)的(de)(de)(de)循(xun)(xun)(xun)環(huan)(huan)，不(bu)(bu)斷吸收車(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)(de)(de)熱量(liang)(liang)并排(pai)到車(che)(che)外(wai)(wai)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)中，使(shi)(shi)(shi)(shi)車(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)的(de)(de)(de)溫(wen)度(du)逐漸下(xia)降。內(nei)(nei)(nei)循(xun)(xun)(xun)環(huan)(huan)可(ke)以提(ti)高(gao)空(kong)(kong)(kong)調(diao)(diao)效果(guo)，相當(dang)于(yu)(yu)把(ba)室內(nei)(nei)(nei)冷(leng)(leng)(leng)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)再制(zhi)(zhi)冷(leng)(leng)(leng)，空(kong)(kong)(kong)調(diao)(diao)效果(guo)當(dang)然更好了。不(bu)(bu)過長時(shi)間使(shi)(shi)(shi)(shi)用(yong)(yong)內(nei)(nei)(nei)循(xun)(xun)(xun)環(huan)(huan)會使(shi)(shi)(shi)(shi)車(che)(che)內(nei)(nei)(nei)的(de)(de)(de)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質(zhi)量(liang)(liang)降低，可(ke)能讓人感覺(jue)頭昏(hun)腦漲。應當(dang)開一(yi)會兒內(nei)(nei)(nei)循(xun)(xun)(xun)環(huan)(huan)就使(shi)(shi)(shi)(shi)用(yong)(yong)幾分(fen)鐘(zhong)外(wai)(wai)循(xun)(xun)(xun)環(huan)(huan)，讓新鮮(xian)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)進(jin)入(ru)車(che)(che)內(nei)(nei)(nei)，改善空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質(zhi)量(liang)(liang)。如果(guo)空(kong)(kong)(kong)調(diao)(diao)內(nei)(nei)(nei)外(wai)(wai)循(xun)(xun)(xun)環(huan)(huan)開關是機械式的(de)(de)(de)撥(bo)桿而(er)非(fei)按鈕，可(ke)以把(ba)撥(bo)桿放(fang)在(zai)內(nei)(nei)(nei)外(wai)(wai)循(xun)(xun)(xun)環(huan)(huan)的(de)(de)(de)中間，讓車(che)(che)外(wai)(wai)空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)適量(liang)(liang)進(jin)入(ru)，既能提(ti)升空(kong)(kong)(kong)氣(qi)(qi)(qi)(qi)質(zhi)量(liang)(liang)，又能提(ti)高(gao)空(kong)(kong)(kong)調(diao)(diao)效果(guo)。此外(wai)(wai)，在(zai)使(shi)(shi)(shi)(shi)用(yong)(yong)空(kong)(kong)(kong)調(diao)(diao)除霜除霧時(shi)，要使(shi)(shi)(shi)(shi)用(yong)(yong)外(wai)(wai)循(xun)(xun)(xun)環(huan)(huan)才有效。