大連車載空調由壓縮(suo)(suo)機(ji)(ji)、冷(leng)凝(ning)器(qi)、節(jie)流元件(jian)、蒸(zheng)(zheng)(zheng)發(fa)器(qi)、風(feng)機(ji)(ji)及必要(yao)的(de)控制(zhi)部件(jian)構成，用(yong)(yong)(yong)(yong)于調(diao)節(jie)車(che)(che)(che)內(nei)(nei)(nei)(nei)溫度(du)、濕(shi)度(du)，給乘員提(ti)供(gong)舒適(shi)環(huan)境的(de)空(kong)(kong)(kong)(kong)(kong)調(diao)系(xi)統(tong)。當(dang)壓縮(suo)(suo)機(ji)(ji)工作時(shi)，壓縮(suo)(suo)機(ji)(ji)吸(xi)入(ru)從(cong)蒸(zheng)(zheng)(zheng)發(fa)器(qi)出來的(de)低(di)(di)(di)溫低(di)(di)(di)壓的(de)氣(qi)(qi)態(tai)(tai)制(zhi)冷(leng)劑(ji)(ji)，經壓縮(suo)(suo)，制(zhi)冷(leng)劑(ji)(ji)的(de)溫度(du)和(he)壓力升(sheng)高，并被(bei)送(song)入(ru)冷(leng)凝(ning)器(qi)。在(zai)(zai)冷(leng)凝(ning)器(qi)內(nei)(nei)(nei)(nei)，高溫高壓的(de)氣(qi)(qi)態(tai)(tai)制(zhi)冷(leng)劑(ji)(ji)把熱(re)(re)量(liang)(liang)傳遞給經過冷(leng)凝(ning)器(qi)的(de)車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)而液(ye)化，變成液(ye)體。液(ye)態(tai)(tai)制(zhi)冷(leng)劑(ji)(ji)流經節(jie)流裝置時(shi)，溫度(du)和(he)壓力降(jiang)低(di)(di)(di)，并進(jin)入(ru)蒸(zheng)(zheng)(zheng)發(fa)器(qi)。在(zai)(zai)蒸(zheng)(zheng)(zheng)發(fa)器(qi)內(nei)(nei)(nei)(nei)，低(di)(di)(di)溫低(di)(di)(di)壓的(de)液(ye)態(tai)(tai)制(zhi)冷(leng)劑(ji)(ji)吸(xi)收經過蒸(zheng)(zheng)(zheng)發(fa)器(qi)的(de)車(che)(che)(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)熱(re)(re)量(liang)(liang)而蒸(zheng)(zheng)(zheng)發(fa)，變成氣(qi)(qi)體。氣(qi)(qi)體又被(bei)壓縮(suo)(suo)機(ji)(ji)吸(xi)入(ru)進(jin)行下(xia)一輪循(xun)環(huan)。這樣，通過制(zhi)冷(leng)劑(ji)(ji)在(zai)(zai)系(xi)統(tong)內(nei)(nei)(nei)(nei)的(de)循(xun)環(huan)，不斷吸(xi)收車(che)(che)(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)熱(re)(re)量(liang)(liang)并排到車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)中，使(shi)(shi)車(che)(che)(che)內(nei)(nei)(nei)(nei)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)溫度(du)逐漸下(xia)降(jiang)。內(nei)(nei)(nei)(nei)循(xun)環(huan)可(ke)以(yi)提(ti)高空(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果，相當(dang)于把室內(nei)(nei)(nei)(nei)冷(leng)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)再制(zhi)冷(leng)，空(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果當(dang)然更好了。不過長時(shi)間(jian)(jian)使(shi)(shi)用(yong)(yong)(yong)(yong)內(nei)(nei)(nei)(nei)循(xun)環(huan)會使(shi)(shi)車(che)(che)(che)內(nei)(nei)(nei)(nei)的(de)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)質(zhi)量(liang)(liang)降(jiang)低(di)(di)(di)，可(ke)能讓人感覺(jue)頭昏腦漲。應當(dang)開(kai)一會兒內(nei)(nei)(nei)(nei)循(xun)環(huan)就使(shi)(shi)用(yong)(yong)(yong)(yong)幾分鐘外(wai)循(xun)環(huan)，讓新鮮空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)進(jin)入(ru)車(che)(che)(che)內(nei)(nei)(nei)(nei)，改善空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)質(zhi)量(liang)(liang)。如果空(kong)(kong)(kong)(kong)(kong)調(diao)內(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)開(kai)關是機(ji)(ji)械式的(de)撥(bo)桿而非按鈕，可(ke)以(yi)把撥(bo)桿放在(zai)(zai)內(nei)(nei)(nei)(nei)外(wai)循(xun)環(huan)的(de)中間(jian)(jian)，讓車(che)(che)(che)外(wai)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)適(shi)量(liang)(liang)進(jin)入(ru)，既能提(ti)升(sheng)空(kong)(kong)(kong)(kong)(kong)氣(qi)(qi)質(zhi)量(liang)(liang)，又能提(ti)高空(kong)(kong)(kong)(kong)(kong)調(diao)效(xiao)果。此(ci)外(wai)，在(zai)(zai)使(shi)(shi)用(yong)(yong)(yong)(yong)空(kong)(kong)(kong)(kong)(kong)調(diao)除(chu)霜除(chu)霧時(shi)，要(yao)使(shi)(shi)用(yong)(yong)(yong)(yong)外(wai)循(xun)環(huan)才有效(xiao)。