大連車載空調由壓(ya)縮(suo)(suo)機(ji)、冷(leng)凝(ning)器、節(jie)流元件(jian)(jian)、蒸(zheng)發器、風機(ji)及必(bi)要(yao)(yao)的(de)(de)(de)(de)控制(zhi)(zhi)(zhi)部件(jian)(jian)構(gou)成(cheng)，用于(yu)調(diao)節(jie)車(che)(che)內(nei)(nei)(nei)溫度(du)、濕度(du)，給(gei)(gei)乘員提(ti)(ti)供(gong)舒適環(huan)境(jing)的(de)(de)(de)(de)空(kong)(kong)(kong)(kong)調(diao)系統(tong)。當(dang)壓(ya)縮(suo)(suo)機(ji)工作時(shi)，壓(ya)縮(suo)(suo)機(ji)吸(xi)入(ru)從蒸(zheng)發器出來的(de)(de)(de)(de)低(di)(di)(di)(di)溫低(di)(di)(di)(di)壓(ya)的(de)(de)(de)(de)氣(qi)(qi)態制(zhi)(zhi)(zhi)冷(leng)劑(ji)，經(jing)壓(ya)縮(suo)(suo)，制(zhi)(zhi)(zhi)冷(leng)劑(ji)的(de)(de)(de)(de)溫度(du)和壓(ya)力(li)升(sheng)高(gao)(gao)，并被送入(ru)冷(leng)凝(ning)器。在(zai)(zai)(zai)冷(leng)凝(ning)器內(nei)(nei)(nei)，高(gao)(gao)溫高(gao)(gao)壓(ya)的(de)(de)(de)(de)氣(qi)(qi)態制(zhi)(zhi)(zhi)冷(leng)劑(ji)把熱量(liang)(liang)(liang)傳(chuan)遞給(gei)(gei)經(jing)過冷(leng)凝(ning)器的(de)(de)(de)(de)車(che)(che)外(wai)(wai)(wai)(wai)(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)而(er)液(ye)化，變(bian)成(cheng)液(ye)體。液(ye)態制(zhi)(zhi)(zhi)冷(leng)劑(ji)流經(jing)節(jie)流裝(zhuang)置時(shi)，溫度(du)和壓(ya)力(li)降低(di)(di)(di)(di)，并進(jin)入(ru)蒸(zheng)發器。在(zai)(zai)(zai)蒸(zheng)發器內(nei)(nei)(nei)，低(di)(di)(di)(di)溫低(di)(di)(di)(di)壓(ya)的(de)(de)(de)(de)液(ye)態制(zhi)(zhi)(zhi)冷(leng)劑(ji)吸(xi)收(shou)經(jing)過蒸(zheng)發器的(de)(de)(de)(de)車(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)(de)(de)熱量(liang)(liang)(liang)而(er)蒸(zheng)發，變(bian)成(cheng)氣(qi)(qi)體。氣(qi)(qi)體又被壓(ya)縮(suo)(suo)機(ji)吸(xi)入(ru)進(jin)行(xing)下(xia)(xia)一(yi)輪循(xun)環(huan)。這樣，通過制(zhi)(zhi)(zhi)冷(leng)劑(ji)在(zai)(zai)(zai)系統(tong)內(nei)(nei)(nei)的(de)(de)(de)(de)循(xun)環(huan)，不斷(duan)吸(xi)收(shou)車(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)(de)(de)熱量(liang)(liang)(liang)并排到車(che)(che)外(wai)(wai)(wai)(wai)(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)中(zhong)，使(shi)(shi)車(che)(che)內(nei)(nei)(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)(de)(de)溫度(du)逐漸下(xia)(xia)降。內(nei)(nei)(nei)循(xun)環(huan)可(ke)(ke)(ke)以提(ti)(ti)高(gao)(gao)空(kong)(kong)(kong)(kong)調(diao)效果(guo)，相當(dang)于(yu)把室內(nei)(nei)(nei)冷(leng)空(kong)(kong)(kong)(kong)氣(qi)(qi)再制(zhi)(zhi)(zhi)冷(leng)，空(kong)(kong)(kong)(kong)調(diao)效果(guo)當(dang)然更好了。不過長時(shi)間(jian)使(shi)(shi)用內(nei)(nei)(nei)循(xun)環(huan)會(hui)使(shi)(shi)車(che)(che)內(nei)(nei)(nei)的(de)(de)(de)(de)空(kong)(kong)(kong)(kong)氣(qi)(qi)質量(liang)(liang)(liang)降低(di)(di)(di)(di)，可(ke)(ke)(ke)能讓人感覺頭昏(hun)腦漲。應當(dang)開一(yi)會(hui)兒內(nei)(nei)(nei)循(xun)環(huan)就使(shi)(shi)用幾分鐘外(wai)(wai)(wai)(wai)(wai)循(xun)環(huan)，讓新鮮(xian)空(kong)(kong)(kong)(kong)氣(qi)(qi)進(jin)入(ru)車(che)(che)內(nei)(nei)(nei)，改(gai)善(shan)空(kong)(kong)(kong)(kong)氣(qi)(qi)質量(liang)(liang)(liang)。如果(guo)空(kong)(kong)(kong)(kong)調(diao)內(nei)(nei)(nei)外(wai)(wai)(wai)(wai)(wai)循(xun)環(huan)開關是(shi)機(ji)械式的(de)(de)(de)(de)撥桿而(er)非按鈕，可(ke)(ke)(ke)以把撥桿放在(zai)(zai)(zai)內(nei)(nei)(nei)外(wai)(wai)(wai)(wai)(wai)循(xun)環(huan)的(de)(de)(de)(de)中(zhong)間(jian)，讓車(che)(che)外(wai)(wai)(wai)(wai)(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)適量(liang)(liang)(liang)進(jin)入(ru)，既(ji)能提(ti)(ti)升(sheng)空(kong)(kong)(kong)(kong)氣(qi)(qi)質量(liang)(liang)(liang)，又能提(ti)(ti)高(gao)(gao)空(kong)(kong)(kong)(kong)調(diao)效果(guo)。此外(wai)(wai)(wai)(wai)(wai)，在(zai)(zai)(zai)使(shi)(shi)用空(kong)(kong)(kong)(kong)調(diao)除(chu)霜除(chu)霧時(shi)，要(yao)(yao)使(shi)(shi)用外(wai)(wai)(wai)(wai)(wai)循(xun)環(huan)才有效。