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Originally Posted by macarose
"Other than that, you might want to check that the cooling system does not have an air pocket in the cylinder head. this will cause the symptoms you describe. the bleed hole is a fiddly bolt in the cylinder head, between the sensors towards the front of the engine."
I need to figure out how to diagnose this.
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when the engine is cold, locate and remove the bleed screw. top up the coolant mixture with water from the overflow tank until it comes out the bleed hole. replace bleed screw. easy as that. if you're planning to change the coolant, that's the correct way to do it.
don't try it when the engine is warm, that's when you'll drop or cross thread the bleed screw.
i've found it's slightly easier to remove one of the temp sensors instead of the bleed screw. acheives the same thing.
good luck