Take off the radiator cap and run the engine for 10-15 mins until hot.
You should be able to look down into the radiator and see the water
moving if the thermostat is open. Never heard of a bleeder screw as it
is a recirculating system.
Could be too much hard deposit build up in the radiator or too many fins
bent over blocking air flow. Have you checked the fan and fan clutch?
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.