大連車載空調由壓(ya)縮(suo)機(ji)、冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)凝(ning)器、節(jie)流(liu)元件、蒸(zheng)(zheng)(zheng)發(fa)器、風機(ji)及(ji)必要的(de)控制(zhi)部(bu)件構(gou)成，用(yong)于調(diao)(diao)(diao)節(jie)車(che)內(nei)溫度、濕度，給乘員提供舒適(shi)環(huan)境(jing)的(de)空(kong)(kong)(kong)調(diao)(diao)(diao)系(xi)統。當(dang)(dang)壓(ya)縮(suo)機(ji)工作時(shi)(shi)，壓(ya)縮(suo)機(ji)吸(xi)入從(cong)蒸(zheng)(zheng)(zheng)發(fa)器出來(lai)的(de)低溫低壓(ya)的(de)氣(qi)(qi)(qi)態制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)，經壓(ya)縮(suo)，制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)的(de)溫度和壓(ya)力升(sheng)高(gao)(gao)，并(bing)被送入冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)凝(ning)器。在(zai)(zai)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)凝(ning)器內(nei)，高(gao)(gao)溫高(gao)(gao)壓(ya)的(de)氣(qi)(qi)(qi)態制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)把熱(re)量(liang)(liang)傳遞給經過(guo)(guo)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)凝(ning)器的(de)車(che)外(wai)(wai)(wai)空(kong)(kong)(kong)氣(qi)(qi)(qi)而(er)液(ye)化，變(bian)成液(ye)體。液(ye)態制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)流(liu)經節(jie)流(liu)裝(zhuang)置時(shi)(shi)，溫度和壓(ya)力降(jiang)低，并(bing)進(jin)入蒸(zheng)(zheng)(zheng)發(fa)器。在(zai)(zai)蒸(zheng)(zheng)(zheng)發(fa)器內(nei)，低溫低壓(ya)的(de)液(ye)態制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)吸(xi)收經過(guo)(guo)蒸(zheng)(zheng)(zheng)發(fa)器的(de)車(che)內(nei)空(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)熱(re)量(liang)(liang)而(er)蒸(zheng)(zheng)(zheng)發(fa)，變(bian)成氣(qi)(qi)(qi)體。氣(qi)(qi)(qi)體又被壓(ya)縮(suo)機(ji)吸(xi)入進(jin)行下(xia)一(yi)輪循(xun)環(huan)。這樣，通過(guo)(guo)制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)劑(ji)(ji)在(zai)(zai)系(xi)統內(nei)的(de)循(xun)環(huan)，不斷吸(xi)收車(che)內(nei)空(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)熱(re)量(liang)(liang)并(bing)排到車(che)外(wai)(wai)(wai)空(kong)(kong)(kong)氣(qi)(qi)(qi)中，使(shi)車(che)內(nei)空(kong)(kong)(kong)氣(qi)(qi)(qi)的(de)溫度逐漸下(xia)降(jiang)。內(nei)循(xun)環(huan)可(ke)以(yi)提高(gao)(gao)空(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)果，相當(dang)(dang)于把室內(nei)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)空(kong)(kong)(kong)氣(qi)(qi)(qi)再制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)，空(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)果當(dang)(dang)然更好了。不過(guo)(guo)長時(shi)(shi)間使(shi)用(yong)內(nei)循(xun)環(huan)會(hui)使(shi)車(che)內(nei)的(de)空(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)降(jiang)低，可(ke)能(neng)讓(rang)人感覺(jue)頭(tou)昏腦漲(zhang)。應當(dang)(dang)開一(yi)會(hui)兒內(nei)循(xun)環(huan)就使(shi)用(yong)幾(ji)分鐘外(wai)(wai)(wai)循(xun)環(huan)，讓(rang)新鮮空(kong)(kong)(kong)氣(qi)(qi)(qi)進(jin)入車(che)內(nei)，改善空(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)。如果空(kong)(kong)(kong)調(diao)(diao)(diao)內(nei)外(wai)(wai)(wai)循(xun)環(huan)開關是機(ji)械式的(de)撥桿而(er)非按鈕，可(ke)以(yi)把撥桿放在(zai)(zai)內(nei)外(wai)(wai)(wai)循(xun)環(huan)的(de)中間，讓(rang)車(che)外(wai)(wai)(wai)空(kong)(kong)(kong)氣(qi)(qi)(qi)適(shi)量(liang)(liang)進(jin)入，既能(neng)提升(sheng)空(kong)(kong)(kong)氣(qi)(qi)(qi)質量(liang)(liang)，又能(neng)提高(gao)(gao)空(kong)(kong)(kong)調(diao)(diao)(diao)效(xiao)果。此外(wai)(wai)(wai)，在(zai)(zai)使(shi)用(yong)空(kong)(kong)(kong)調(diao)(diao)(diao)除(chu)霜除(chu)霧時(shi)(shi)，要使(shi)用(yong)外(wai)(wai)(wai)循(xun)環(huan)才有效(xiao)。