大連車載空調由壓(ya)縮機(ji)(ji)、冷(leng)(leng)(leng)凝器(qi)(qi)、節流(liu)元件、蒸(zheng)(zheng)發(fa)器(qi)(qi)、風機(ji)(ji)及(ji)必要(yao)(yao)的(de)(de)(de)控制(zhi)(zhi)部件構成，用(yong)于(yu)調(diao)(diao)節車(che)(che)內(nei)溫(wen)度(du)(du)、濕度(du)(du)，給乘員提供舒適環境的(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)系統。當壓(ya)縮機(ji)(ji)工作時(shi)，壓(ya)縮機(ji)(ji)吸(xi)入從(cong)蒸(zheng)(zheng)發(fa)器(qi)(qi)出來(lai)的(de)(de)(de)低(di)(di)溫(wen)低(di)(di)壓(ya)的(de)(de)(de)氣(qi)(qi)(qi)態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)(ji)，經壓(ya)縮，制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)(ji)的(de)(de)(de)溫(wen)度(du)(du)和壓(ya)力(li)(li)升高，并(bing)被送入冷(leng)(leng)(leng)凝器(qi)(qi)。在(zai)冷(leng)(leng)(leng)凝器(qi)(qi)內(nei)，高溫(wen)高壓(ya)的(de)(de)(de)氣(qi)(qi)(qi)態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)(ji)把(ba)熱量(liang)(liang)傳(chuan)遞給經過(guo)冷(leng)(leng)(leng)凝器(qi)(qi)的(de)(de)(de)車(che)(che)外(wai)(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)而液(ye)(ye)化，變成液(ye)(ye)體。液(ye)(ye)態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)(ji)流(liu)經節流(liu)裝置時(shi)，溫(wen)度(du)(du)和壓(ya)力(li)(li)降低(di)(di)，并(bing)進入蒸(zheng)(zheng)發(fa)器(qi)(qi)。在(zai)蒸(zheng)(zheng)發(fa)器(qi)(qi)內(nei)，低(di)(di)溫(wen)低(di)(di)壓(ya)的(de)(de)(de)液(ye)(ye)態(tai)(tai)制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)(ji)吸(xi)收經過(guo)蒸(zheng)(zheng)發(fa)器(qi)(qi)的(de)(de)(de)車(che)(che)內(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)熱量(liang)(liang)而蒸(zheng)(zheng)發(fa)，變成氣(qi)(qi)(qi)體。氣(qi)(qi)(qi)體又被壓(ya)縮機(ji)(ji)吸(xi)入進行下一輪循(xun)環。這樣，通過(guo)制(zhi)(zhi)冷(leng)(leng)(leng)劑(ji)(ji)在(zai)系統內(nei)的(de)(de)(de)循(xun)環，不斷(duan)吸(xi)收車(che)(che)內(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)熱量(liang)(liang)并(bing)排到車(che)(che)外(wai)(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)中(zhong)，使車(che)(che)內(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)溫(wen)度(du)(du)逐漸下降。內(nei)循(xun)環可以提高空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)效(xiao)(xiao)果(guo)(guo)，相當于(yu)把(ba)室(shi)內(nei)冷(leng)(leng)(leng)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)再制(zhi)(zhi)冷(leng)(leng)(leng)，空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)效(xiao)(xiao)果(guo)(guo)當然更好(hao)了。不過(guo)長(chang)時(shi)間使用(yong)內(nei)循(xun)環會使車(che)(che)內(nei)的(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)降低(di)(di)，可能(neng)讓(rang)人感覺頭昏腦漲。應(ying)當開一會兒內(nei)循(xun)環就使用(yong)幾分鐘外(wai)(wai)循(xun)環，讓(rang)新鮮空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)進入車(che)(che)內(nei)，改善(shan)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)。如(ru)果(guo)(guo)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)內(nei)外(wai)(wai)循(xun)環開關是機(ji)(ji)械式的(de)(de)(de)撥桿而非(fei)按鈕，可以把(ba)撥桿放在(zai)內(nei)外(wai)(wai)循(xun)環的(de)(de)(de)中(zhong)間，讓(rang)車(che)(che)外(wai)(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)適量(liang)(liang)進入，既(ji)能(neng)提升空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)，又能(neng)提高空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)效(xiao)(xiao)果(guo)(guo)。此外(wai)(wai)，在(zai)使用(yong)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)除霜除霧時(shi)，要(yao)(yao)使用(yong)外(wai)(wai)循(xun)環才有效(xiao)(xiao)。