大連車載空調由壓(ya)(ya)縮機(ji)、冷(leng)凝(ning)(ning)器、節(jie)流元件、蒸(zheng)發(fa)器、風機(ji)及必要的(de)(de)(de)(de)控制部件構(gou)成，用(yong)于調(diao)(diao)節(jie)車內(nei)溫度、濕度，給乘(cheng)員提供舒適(shi)環(huan)境的(de)(de)(de)(de)空(kong)(kong)(kong)(kong)調(diao)(diao)系統。當壓(ya)(ya)縮機(ji)工作(zuo)時(shi)，壓(ya)(ya)縮機(ji)吸入(ru)(ru)從蒸(zheng)發(fa)器出來的(de)(de)(de)(de)低溫低壓(ya)(ya)的(de)(de)(de)(de)氣(qi)(qi)態(tai)制冷(leng)劑，經壓(ya)(ya)縮，制冷(leng)劑的(de)(de)(de)(de)溫度和壓(ya)(ya)力升高，并(bing)被(bei)送入(ru)(ru)冷(leng)凝(ning)(ning)器。在(zai)(zai)(zai)冷(leng)凝(ning)(ning)器內(nei)，高溫高壓(ya)(ya)的(de)(de)(de)(de)氣(qi)(qi)態(tai)制冷(leng)劑把(ba)熱量(liang)(liang)傳遞給經過冷(leng)凝(ning)(ning)器的(de)(de)(de)(de)車外(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)而液(ye)化，變(bian)成液(ye)體。液(ye)態(tai)制冷(leng)劑流經節(jie)流裝(zhuang)置時(shi)，溫度和壓(ya)(ya)力降低，并(bing)進(jin)(jin)入(ru)(ru)蒸(zheng)發(fa)器。在(zai)(zai)(zai)蒸(zheng)發(fa)器內(nei)，低溫低壓(ya)(ya)的(de)(de)(de)(de)液(ye)態(tai)制冷(leng)劑吸收經過蒸(zheng)發(fa)器的(de)(de)(de)(de)車內(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)(de)(de)熱量(liang)(liang)而蒸(zheng)發(fa)，變(bian)成氣(qi)(qi)體。氣(qi)(qi)體又被(bei)壓(ya)(ya)縮機(ji)吸入(ru)(ru)進(jin)(jin)行下(xia)一(yi)輪循(xun)(xun)環(huan)。這樣(yang)，通(tong)過制冷(leng)劑在(zai)(zai)(zai)系統內(nei)的(de)(de)(de)(de)循(xun)(xun)環(huan)，不斷(duan)吸收車內(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)(de)(de)熱量(liang)(liang)并(bing)排到車外(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)中(zhong)，使(shi)車內(nei)空(kong)(kong)(kong)(kong)氣(qi)(qi)的(de)(de)(de)(de)溫度逐漸(jian)下(xia)降。內(nei)循(xun)(xun)環(huan)可(ke)以(yi)(yi)提高空(kong)(kong)(kong)(kong)調(diao)(diao)效(xiao)果(guo)(guo)，相(xiang)當于把(ba)室內(nei)冷(leng)空(kong)(kong)(kong)(kong)氣(qi)(qi)再制冷(leng)，空(kong)(kong)(kong)(kong)調(diao)(diao)效(xiao)果(guo)(guo)當然更好了。不過長時(shi)間(jian)使(shi)用(yong)內(nei)循(xun)(xun)環(huan)會使(shi)車內(nei)的(de)(de)(de)(de)空(kong)(kong)(kong)(kong)氣(qi)(qi)質量(liang)(liang)降低，可(ke)能(neng)讓人感覺頭昏腦漲。應當開一(yi)會兒內(nei)循(xun)(xun)環(huan)就使(shi)用(yong)幾分鐘外(wai)循(xun)(xun)環(huan)，讓新鮮空(kong)(kong)(kong)(kong)氣(qi)(qi)進(jin)(jin)入(ru)(ru)車內(nei)，改(gai)善空(kong)(kong)(kong)(kong)氣(qi)(qi)質量(liang)(liang)。如果(guo)(guo)空(kong)(kong)(kong)(kong)調(diao)(diao)內(nei)外(wai)循(xun)(xun)環(huan)開關是(shi)機(ji)械(xie)式(shi)的(de)(de)(de)(de)撥桿而非按(an)鈕，可(ke)以(yi)(yi)把(ba)撥桿放在(zai)(zai)(zai)內(nei)外(wai)循(xun)(xun)環(huan)的(de)(de)(de)(de)中(zhong)間(jian)，讓車外(wai)空(kong)(kong)(kong)(kong)氣(qi)(qi)適(shi)量(liang)(liang)進(jin)(jin)入(ru)(ru)，既能(neng)提升空(kong)(kong)(kong)(kong)氣(qi)(qi)質量(liang)(liang)，又能(neng)提高空(kong)(kong)(kong)(kong)調(diao)(diao)效(xiao)果(guo)(guo)。此外(wai)，在(zai)(zai)(zai)使(shi)用(yong)空(kong)(kong)(kong)(kong)調(diao)(diao)除(chu)霜除(chu)霧(wu)時(shi)，要使(shi)用(yong)外(wai)循(xun)(xun)環(huan)才有效(xiao)。