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Originally Posted by John_AZ
You mentioned the coolant level looked OK.
Have you noticed any small loss of coolant in the reservoir?
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No loss of coolant, sitting spot on the max mark
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When you check the spark plugs, does one look like it was steam cleaned?
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Plugs all look the same with nice tan colour.
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Before you drain the coolant and check the thermostat, "burp" the coolant system to make sure you do not have an air pocket. Lift the front up on jack stands.
Open the coolant air relief bolt, wrap a rag around the part to catch overflow and squeeze the top hose gently.
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Tried this yesterday and the hose was quite firm directly after driving the car and it did produce a 'burp' into the expansion tank. However today the hose was soft and no 'burp' was produced when I squeezed it, though this was after the car had been sitting for an hour or so.
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Sometimes the radiator fan switch contacts get fouled and not make contact correctly or soon enough. Replace the switch with the same temp as the old one. (3 temps available)
Make sure the contacts on the coolant temp sensor are clean.
Bad grounds can cause overheating. Clean the battery posts and the large negative cable connection on top of the bell housing. Cover the TDC hole with tape.
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Not tried these yet, interestingly why does the TDC hole need to be covered with tape?
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Clean the front of the radiator. Spray with a strong cleaner and rinse from the engine side to push the dirt out and not further in the radiator fins.
Just a few ideas.
GL
John
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Not tried this yet either.