I-thermostat ilungisa ngokuzenzekelayo ubungakanani bamanzi angena kwi-radiator ngokweqondo lobushushu bamanzi apholisayo kwaye itshintshe uluhlu lokujikeleza kwamanzi ukuze ilungise amandla okusasaza ubushushu kwenkqubo yokupholisa kwaye iqinisekise ukuba injini isebenza ngaphakathi komgangatho wobushushu ofanelekileyo. I-thermostat kufuneka igcinwe ikwimeko entle yobugcisa, kungenjalo iya kuchaphazela kakhulu ukusebenza kwesiqhelo kwenjini. Ukuba ivalvu ephambili ye-thermostat ivulwe kade kakhulu, iya kubangela ubushushu obukhulu benjini; Ukuba ivalvu ephambili ivulwe kwangethuba kakhulu, ixesha lokufudumeza injini liya kwanda kwaye ubushushu benjini buya kuba phantsi kakhulu.
Lilonke, injongo ye-thermostat kukugcina injini ingabandi kakhulu. Umzekelo, emva kokuba injini isebenza kakuhle, injini inokubanda kakhulu ngesantya sasebusika ngaphandle kwe-thermostat. Ngeli xesha, injini kufuneka iyeke ukujikeleza kwamanzi okwethutyana ukuqinisekisa ukuba ubushushu benjini abuphantsi kakhulu.
