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engine temperature too hot?

My E39 showing engine temperature too hot on-off at intervals even when engine is rested overnight. Pls help. Thanks.
Ed Malik, February 2011
overheating:1.insuffucient coolant in the system.2.water pump drivebelt defective or not adjusted properly.3.Radiator core blocked or radiator grille dirty and restricted.4.Thermostat faulty.5.Fan blades broken or cracked.6.Radiator cap not maintaining proper pressure.7.Ingition timing incorrect.

shadow_08, February 2011