大連車載空調由壓(ya)縮機(ji)(ji)、冷(leng)(leng)凝(ning)器、節流(liu)元件、蒸(zheng)(zheng)(zheng)發器、風機(ji)(ji)及必要的(de)(de)(de)(de)(de)(de)控制(zhi)(zhi)(zhi)部件構成，用(yong)于調(diao)(diao)(diao)節車(che)(che)(che)內(nei)(nei)(nei)溫(wen)度、濕度，給乘員提(ti)供舒適(shi)環(huan)境(jing)的(de)(de)(de)(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)系統。當(dang)壓(ya)縮機(ji)(ji)工(gong)作時(shi)，壓(ya)縮機(ji)(ji)吸(xi)入從蒸(zheng)(zheng)(zheng)發器出來的(de)(de)(de)(de)(de)(de)低(di)溫(wen)低(di)壓(ya)的(de)(de)(de)(de)(de)(de)氣(qi)(qi)(qi)態(tai)(tai)(tai)制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)，經壓(ya)縮，制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)的(de)(de)(de)(de)(de)(de)溫(wen)度和(he)壓(ya)力升高(gao)，并(bing)被(bei)送入冷(leng)(leng)凝(ning)器。在(zai)冷(leng)(leng)凝(ning)器內(nei)(nei)(nei)，高(gao)溫(wen)高(gao)壓(ya)的(de)(de)(de)(de)(de)(de)氣(qi)(qi)(qi)態(tai)(tai)(tai)制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)把(ba)熱(re)量傳遞給經過(guo)(guo)(guo)冷(leng)(leng)凝(ning)器的(de)(de)(de)(de)(de)(de)車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)而液(ye)化，變成液(ye)體(ti)(ti)。液(ye)態(tai)(tai)(tai)制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)流(liu)經節流(liu)裝置時(shi)，溫(wen)度和(he)壓(ya)力降(jiang)(jiang)低(di)，并(bing)進入蒸(zheng)(zheng)(zheng)發器。在(zai)蒸(zheng)(zheng)(zheng)發器內(nei)(nei)(nei)，低(di)溫(wen)低(di)壓(ya)的(de)(de)(de)(de)(de)(de)液(ye)態(tai)(tai)(tai)制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)吸(xi)收經過(guo)(guo)(guo)蒸(zheng)(zheng)(zheng)發器的(de)(de)(de)(de)(de)(de)車(che)(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)熱(re)量而蒸(zheng)(zheng)(zheng)發，變成氣(qi)(qi)(qi)體(ti)(ti)。氣(qi)(qi)(qi)體(ti)(ti)又被(bei)壓(ya)縮機(ji)(ji)吸(xi)入進行下(xia)一輪循(xun)(xun)環(huan)。這(zhe)樣，通(tong)過(guo)(guo)(guo)制(zhi)(zhi)(zhi)冷(leng)(leng)劑(ji)在(zai)系統內(nei)(nei)(nei)的(de)(de)(de)(de)(de)(de)循(xun)(xun)環(huan)，不斷吸(xi)收車(che)(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)熱(re)量并(bing)排到車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)中(zhong)，使(shi)(shi)車(che)(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)溫(wen)度逐漸下(xia)降(jiang)(jiang)。內(nei)(nei)(nei)循(xun)(xun)環(huan)可(ke)以(yi)提(ti)高(gao)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)，相當(dang)于把(ba)室內(nei)(nei)(nei)冷(leng)(leng)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)再制(zhi)(zhi)(zhi)冷(leng)(leng)，空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)當(dang)然更(geng)好了。不過(guo)(guo)(guo)長(chang)時(shi)間(jian)使(shi)(shi)用(yong)內(nei)(nei)(nei)循(xun)(xun)環(huan)會使(shi)(shi)車(che)(che)(che)內(nei)(nei)(nei)的(de)(de)(de)(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量降(jiang)(jiang)低(di)，可(ke)能讓人感覺頭昏腦漲。應當(dang)開一會兒內(nei)(nei)(nei)循(xun)(xun)環(huan)就使(shi)(shi)用(yong)幾(ji)分鐘外(wai)循(xun)(xun)環(huan)，讓新(xin)鮮(xian)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)進入車(che)(che)(che)內(nei)(nei)(nei)，改(gai)善空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量。如果(guo)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)內(nei)(nei)(nei)外(wai)循(xun)(xun)環(huan)開關是機(ji)(ji)械式的(de)(de)(de)(de)(de)(de)撥(bo)桿而非按鈕，可(ke)以(yi)把(ba)撥(bo)桿放在(zai)內(nei)(nei)(nei)外(wai)循(xun)(xun)環(huan)的(de)(de)(de)(de)(de)(de)中(zhong)間(jian)，讓車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)適(shi)量進入，既(ji)能提(ti)升空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)(qi)質量，又能提(ti)高(gao)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)效果(guo)。此外(wai)，在(zai)使(shi)(shi)用(yong)空(kong)(kong)(kong)(kong)(kong)調(diao)(diao)(diao)除霜除霧時(shi)，要使(shi)(shi)用(yong)外(wai)循(xun)(xun)環(huan)才(cai)有效。