大連車載空調由壓(ya)縮機(ji)、冷(leng)(leng)凝器、節(jie)流(liu)元(yuan)件、蒸(zheng)發(fa)(fa)(fa)(fa)器、風機(ji)及必要(yao)的(de)(de)控制(zhi)部(bu)件構(gou)成(cheng)，用于調(diao)節(jie)車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)溫(wen)度(du)(du)、濕度(du)(du)，給乘員提(ti)供(gong)舒適環(huan)境的(de)(de)空(kong)(kong)(kong)(kong)(kong)調(diao)系統。當壓(ya)縮機(ji)工作時，壓(ya)縮機(ji)吸(xi)(xi)(xi)入(ru)從蒸(zheng)發(fa)(fa)(fa)(fa)器出(chu)來的(de)(de)低(di)(di)溫(wen)低(di)(di)壓(ya)的(de)(de)氣(qi)(qi)(qi)態(tai)制(zhi)冷(leng)(leng)劑(ji)(ji)(ji)(ji)，經(jing)(jing)壓(ya)縮，制(zhi)冷(leng)(leng)劑(ji)(ji)(ji)(ji)的(de)(de)溫(wen)度(du)(du)和壓(ya)力(li)升高(gao)(gao)，并(bing)被送入(ru)冷(leng)(leng)凝器。在(zai)(zai)冷(leng)(leng)凝器內(nei)(nei)(nei)(nei)(nei)，高(gao)(gao)溫(wen)高(gao)(gao)壓(ya)的(de)(de)氣(qi)(qi)(qi)態(tai)制(zhi)冷(leng)(leng)劑(ji)(ji)(ji)(ji)把熱(re)量(liang)(liang)(liang)傳遞給經(jing)(jing)過冷(leng)(leng)凝器的(de)(de)車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)而液化，變成(cheng)液體(ti)(ti)。液態(tai)制(zhi)冷(leng)(leng)劑(ji)(ji)(ji)(ji)流(liu)經(jing)(jing)節(jie)流(liu)裝置時，溫(wen)度(du)(du)和壓(ya)力(li)降低(di)(di)，并(bing)進(jin)入(ru)蒸(zheng)發(fa)(fa)(fa)(fa)器。在(zai)(zai)蒸(zheng)發(fa)(fa)(fa)(fa)器內(nei)(nei)(nei)(nei)(nei)，低(di)(di)溫(wen)低(di)(di)壓(ya)的(de)(de)液態(tai)制(zhi)冷(leng)(leng)劑(ji)(ji)(ji)(ji)吸(xi)(xi)(xi)收(shou)經(jing)(jing)過蒸(zheng)發(fa)(fa)(fa)(fa)器的(de)(de)車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)熱(re)量(liang)(liang)(liang)而蒸(zheng)發(fa)(fa)(fa)(fa)，變成(cheng)氣(qi)(qi)(qi)體(ti)(ti)。氣(qi)(qi)(qi)體(ti)(ti)又被壓(ya)縮機(ji)吸(xi)(xi)(xi)入(ru)進(jin)行下(xia)一輪循(xun)環(huan)。這(zhe)樣(yang)，通(tong)過制(zhi)冷(leng)(leng)劑(ji)(ji)(ji)(ji)在(zai)(zai)系統內(nei)(nei)(nei)(nei)(nei)的(de)(de)循(xun)環(huan)，不(bu)斷吸(xi)(xi)(xi)收(shou)車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)熱(re)量(liang)(liang)(liang)并(bing)排到車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)中，使(shi)車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)溫(wen)度(du)(du)逐漸下(xia)降。內(nei)(nei)(nei)(nei)(nei)循(xun)環(huan)可以提(ti)高(gao)(gao)空(kong)(kong)(kong)(kong)(kong)調(diao)效果(guo)，相當于把室(shi)內(nei)(nei)(nei)(nei)(nei)冷(leng)(leng)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)再制(zhi)冷(leng)(leng)，空(kong)(kong)(kong)(kong)(kong)調(diao)效果(guo)當然更好了(le)。不(bu)過長時間(jian)使(shi)用內(nei)(nei)(nei)(nei)(nei)循(xun)環(huan)會使(shi)車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)的(de)(de)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)(liang)降低(di)(di)，可能讓人感覺(jue)頭昏(hun)腦(nao)漲。應(ying)當開(kai)一會兒內(nei)(nei)(nei)(nei)(nei)循(xun)環(huan)就使(shi)用幾(ji)分鐘外(wai)循(xun)環(huan)，讓新(xin)鮮空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)進(jin)入(ru)車(che)(che)(che)內(nei)(nei)(nei)(nei)(nei)，改(gai)善空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)(liang)。如果(guo)空(kong)(kong)(kong)(kong)(kong)調(diao)內(nei)(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)開(kai)關是機(ji)械(xie)式的(de)(de)撥桿而非按鈕，可以把撥桿放在(zai)(zai)內(nei)(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)的(de)(de)中間(jian)，讓車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)適量(liang)(liang)(liang)進(jin)入(ru)，既能提(ti)升空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)(liang)，又能提(ti)高(gao)(gao)空(kong)(kong)(kong)(kong)(kong)調(diao)效果(guo)。此(ci)外(wai)，在(zai)(zai)使(shi)用空(kong)(kong)(kong)(kong)(kong)調(diao)除(chu)霜除(chu)霧時，要(yao)使(shi)用外(wai)循(xun)環(huan)才有效。