Thermostat ni ubwoko bw'igikoresho kigenzura ubushyuhe cyikora, ubusanzwe kirimo igice cyo kumenya ubushyuhe, binyuze mu kwagura cyangwa kugabanya kugira ngo gifungure kandi kizimye amazi akonjesha, ni ukuvuga, guhindura amazi mu cyuma gikonjesha mu buryo bwikora hakurikijwe ubushyuhe bw'amazi akonjesha, guhindura urwego rw'amazi akonjesha azenguruka, kugira ngo gihindure ubushobozi bwo gukwirakwiza ubushyuhe mu buryo bukonjesha.
Thermostat nyamukuru ya moteri ni thermostat yo mu bwoko bwa wax, igenzurwa na parafini imbere binyuze mu ihame ryo kwaguka k'ubushyuhe no gukonja kugira ngo igenzure urujya n'uruza rw'ibikoresho bikonjesha. Iyo ubushyuhe bwo gukonjesha buri hasi y'agaciro kagenwe, parafini itunganijwe mu mubiri upima ubushyuhe bwa thermostat iba ikomeye, valve ya thermostat iri munsi y'igikorwa cy'isoko kugira ngo ifunge umuyoboro uri hagati ya moteri na radiator, coolant inyuze mu ipompe y'amazi kugira ngo igaruke kuri moteri, moteri igenda yihuta. Iyo ubushyuhe bw'ibikoresho bikonjesha bugeze ku gaciro kagenwe, parafini itangira gushonga hanyuma ihinduka amazi buhoro buhoro, kandi ingano iriyongera igakanda umuyoboro wa rubber kugira ngo igabanuke. Muri icyo gihe, umuyoboro wa rubber uragabanuka ugashyira hejuru ku mushumi usunika. Umushumi usunika ufite umushumi umanuka kuri valve kugira ngo valve ifunguke. Muri icyo gihe, coolant inyura muri radiator na valve ya thermostat, hanyuma igasubira muri moteri inyuze muri pompe y'amazi kugira ngo igere ku mugezi munini. Thermostat nyinshi ishyizwe mu muyoboro w'amazi w'umutwe wa silindiri, ufite akarusho koroshye kandi koroshye gusohora utubumbe mu buryo bwo gukonjesha; Ingorane ni uko thermostat ikunze gufungura no gufunga iyo ikora, bigatuma habaho guhindagurika kw'ikirere.
Iyo ubushyuhe bw'imikorere ya moteri buri hasi (munsi ya 70°C), thermostat ifunga inzira igana kuri radiator, igafungura inzira igana kuri pompe y'amazi. Amazi akonje ava mu gikapu cy'amazi yinjira mu gikapu cy'amazi anyuze mu muyoboro, maze yoherezwa mu gikapu cy'amazi anyuze kuri pompe y'amazi kugira ngo itembe. Kubera ko amazi akonje adashira muri radiator, ubushyuhe bw'imikorere ya moteri bushobora kwiyongera vuba. Iyo ubushyuhe bw'imikorere ya moteri buri hejuru (hejuru ya 80°C), thermostat ifunga inzira igana kuri pompe y'amazi, hanyuma igafungura inzira igana kuri radiator. Amazi akonje ava mu gikapu cy'amazi akonjeshwa na radiator hanyuma akoherezwa mu gikapu cy'amazi anyuze kuri pompe y'amazi, ibyo bikanoza ubushyuhe bw'ubukonje kandi bikabuza moteri gushyuha cyane. Iyi nzira y'ubushyuhe yitwa cycle nini. Iyo ubushyuhe bw'imikorere ya moteri buri hagati ya 70°C na 80°C, cycle nini n'izito zibaho icyarimwe, ni ukuvuga igice cy'amazi akonjeshwa mu gikapu kinini, n'ikindi gice cy'amazi akonjeshwa mu gikapu gito.
Akamaro k'ikinyabutabire cy'imodoka ni ugufunga imodoka mbere y'uko ubushyuhe butagera ku bushyuhe busanzwe. Muri iki gihe, amazi akonjesha ya moteri asubizwa muri moteri hakoreshejwe ipompo y'amazi, kandi amazi make azenguruka moteri agakorwa kugira ngo moteri ishyuhe vuba. Iyo ubushyuhe burenze ubusanzwe bushobora gufungurwa, kugira ngo amazi akonjesha anyure mu ruziga rwa radiateri yose kugira ngo agere ku muvuduko munini, bityo ubushyuhe bushobore gushonga vuba.
