The cooling system might not need bleeding after just changing the thermostat.
Lots of modern cooling systems are self-bleeding but some are so problematic special tools have been developed to cope. The tool evacuates the air from the cooling system and then when the vacuum is released the coolant fill is complete.
Some manufacturers fit one, two or more bleeder screws to help bleed the cooling system but others must have various hoses temporarily disconnected, either with a running engine or a pressurised cooling system - wet sleeves and a faceful of coolant soon teaches the apprentice the technique for minimum wetness.
Remove rad cap while cold start and run engine making sure to keep it full also check for air bleeds along the system usually near tstat or on top most cooling system component
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