From a person who had been wrenching since the '70s and teaching automotive service TECHNOLOGY since the early '90s, reinstall or replace the thermostat. Stay away from that "mechanic"
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Yes balak ko ipabalik. How do i test the thermostat if it's working? Natry ko ilublob sa boiling water pero nothing happened eh.
EDIT: Pinakulo ko ung thermostat, bumukas siya. so working pa siya.