I have this problem regarding my civic VTI 2002. After riding for atleast 5-6 hours. My temp gauge will rise after heavy acceleration and sometimes in idle. I've noticed that everytime the car will run even atleast 20kph, no temperature rising encountered, even in high speed (120-140 kph) and traffic. High temp will only encountered when after riding for 5-6 hours. What should be the problem. Ihave my radiator overholed. I also removed my thermostat and replaced my thermoswitch. i also noticed bubbles in my radiator and in a long drive. my reservoir is full. no tagas of water naman so far. please help