大連車載空調由壓(ya)縮機(ji)、冷(leng)(leng)(leng)(leng)(leng)(leng)凝器(qi)(qi)(qi)、節(jie)流元(yuan)件(jian)、蒸(zheng)(zheng)發(fa)器(qi)(qi)(qi)、風(feng)機(ji)及必要的(de)(de)控制(zhi)部(bu)件(jian)構成，用于調節(jie)車(che)內(nei)(nei)溫度(du)、濕度(du)，給乘員提供舒適環(huan)境的(de)(de)空(kong)(kong)(kong)調系(xi)統。當壓(ya)縮機(ji)工作時(shi)，壓(ya)縮機(ji)吸(xi)(xi)入(ru)從蒸(zheng)(zheng)發(fa)器(qi)(qi)(qi)出來的(de)(de)低(di)(di)溫低(di)(di)壓(ya)的(de)(de)氣態(tai)(tai)制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)，經壓(ya)縮，制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)的(de)(de)溫度(du)和壓(ya)力升高(gao)(gao)，并(bing)被(bei)送入(ru)冷(leng)(leng)(leng)(leng)(leng)(leng)凝器(qi)(qi)(qi)。在冷(leng)(leng)(leng)(leng)(leng)(leng)凝器(qi)(qi)(qi)內(nei)(nei)，高(gao)(gao)溫高(gao)(gao)壓(ya)的(de)(de)氣態(tai)(tai)制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)把熱(re)量傳遞給經過(guo)(guo)冷(leng)(leng)(leng)(leng)(leng)(leng)凝器(qi)(qi)(qi)的(de)(de)車(che)外(wai)空(kong)(kong)(kong)氣而液(ye)(ye)化，變(bian)成液(ye)(ye)體(ti)。液(ye)(ye)態(tai)(tai)制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)流經節(jie)流裝(zhuang)置時(shi)，溫度(du)和壓(ya)力降低(di)(di)，并(bing)進入(ru)蒸(zheng)(zheng)發(fa)器(qi)(qi)(qi)。在蒸(zheng)(zheng)發(fa)器(qi)(qi)(qi)內(nei)(nei)，低(di)(di)溫低(di)(di)壓(ya)的(de)(de)液(ye)(ye)態(tai)(tai)制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)吸(xi)(xi)收經過(guo)(guo)蒸(zheng)(zheng)發(fa)器(qi)(qi)(qi)的(de)(de)車(che)內(nei)(nei)空(kong)(kong)(kong)氣的(de)(de)熱(re)量而蒸(zheng)(zheng)發(fa)，變(bian)成氣體(ti)。氣體(ti)又被(bei)壓(ya)縮機(ji)吸(xi)(xi)入(ru)進行(xing)下一(yi)輪循(xun)(xun)環(huan)。這(zhe)樣，通過(guo)(guo)制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)在系(xi)統內(nei)(nei)的(de)(de)循(xun)(xun)環(huan)，不斷吸(xi)(xi)收車(che)內(nei)(nei)空(kong)(kong)(kong)氣的(de)(de)熱(re)量并(bing)排(pai)到車(che)外(wai)空(kong)(kong)(kong)氣中(zhong)，使車(che)內(nei)(nei)空(kong)(kong)(kong)氣的(de)(de)溫度(du)逐漸下降。內(nei)(nei)循(xun)(xun)環(huan)可以提高(gao)(gao)空(kong)(kong)(kong)調效果(guo)，相當于把室內(nei)(nei)冷(leng)(leng)(leng)(leng)(leng)(leng)空(kong)(kong)(kong)氣再(zai)制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)，空(kong)(kong)(kong)調效果(guo)當然更好了。不過(guo)(guo)長時(shi)間使用內(nei)(nei)循(xun)(xun)環(huan)會使車(che)內(nei)(nei)的(de)(de)空(kong)(kong)(kong)氣質量降低(di)(di)，可能(neng)讓(rang)(rang)人感覺頭昏腦漲。應(ying)當開一(yi)會兒(er)內(nei)(nei)循(xun)(xun)環(huan)就使用幾分鐘外(wai)循(xun)(xun)環(huan)，讓(rang)(rang)新鮮空(kong)(kong)(kong)氣進入(ru)車(che)內(nei)(nei)，改善空(kong)(kong)(kong)氣質量。如(ru)果(guo)空(kong)(kong)(kong)調內(nei)(nei)外(wai)循(xun)(xun)環(huan)開關是機(ji)械(xie)式(shi)的(de)(de)撥(bo)(bo)桿而非按鈕，可以把撥(bo)(bo)桿放在內(nei)(nei)外(wai)循(xun)(xun)環(huan)的(de)(de)中(zhong)間，讓(rang)(rang)車(che)外(wai)空(kong)(kong)(kong)氣適量進入(ru)，既能(neng)提升空(kong)(kong)(kong)氣質量，又能(neng)提高(gao)(gao)空(kong)(kong)(kong)調效果(guo)。此外(wai)，在使用空(kong)(kong)(kong)調除霜除霧時(shi)，要使用外(wai)循(xun)(xun)環(huan)才有效。