You can take the stat out and test it in a pot of boiling water to see id it is stuck ,if it opens all the way it is good .I am assuming that you checked the fluid level .how long has it been since you flush the system ? If it is due for a flush and refill I would consider that .have
you bleed the system lately ? That is something i do every six month as routine maintenance.there could be alot of problems to tackle here and of all fails then time to replace parts .
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