My Civic after running more than an hour, my temperature gauge on the dash will suddenly spike to the maximum, yon talagang dulo ng gauge, lampas pa sa red mark, pero after 10-15 seconds, babalik sya sa middle ng gauge,

Ano sa tinign nyo ang defective. the engine is not losing power naman. I already have a new radiator.looks ok naman ang cooling.

I hope you can help me with this poblem. THNAKS!!!!