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Dave wrote:Was the replacement fan new or used? It may need the silicone fluid to lock it up to keep up with the engine.
adnj wrote:The engine operating temperature cannot exhibit wide fluctuations in the space of a few seconds.
If the temperature sender is located in a vapor pocket of the cooling system, the temperature can go up quickly while surrounded by higher temperature vapor and then drop quickly when surrounded by lower temperature fluid.
Check the coolant system and be certain that it doesn't have any air in it.
If the temperature sender fails, you could possibly be reading the changes in vehicle voltage as you rev the engine.
The gauge should move from normal temperature to cold after the engine has been allowed to cool overnight. Check the sensor with an ohm meter. The resistance should be about 50 kΩ. The resistance should be about 2 kΩ at normal operating temperature.
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