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When coolant level is lower than normal, temperature spikes as you described are the symptoms.
Coolant looses sometimes are very difficult to detect with visual inspection as the leak is not fast enough to drip. At most you would only get stains and usually these are from joints of hoses.
You need to do a system pressure test to find the leakage.
Sunday, October 26th, 2008 AT 7:17 PM