Several-problems are in question.
1) low antifreeze coolant.
2)vacuum hose is unplugged from the circulation valve.
3) problem with your temperature control unit, heat/coldzperiodz
4) if it overheats is got stack thermostat.
5) the hose is bad having a bobble inside there for crating restriction flow of antifreeze.
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i can not find it
Check www.autozone.com
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I would guess the thermostat I would guess the thermostat