99 accord 3.0 Start car drive a 1/2 mile gauge comes up 1/4 way stay there. last couple days we've been about 95 degrees degrees after driving 15 mins with a/c on both fans working come to a stop light after a min gauge goes all the way up. tried put car in nuetral and rev up gauge stays up until I move more than 30 35 miles hr 40 50 gauge drops right away to 1/2 way next light same thing or if I'm cruzing 20 25 same gauge is all the way up new rad cap anti freeze id push into bottle and won't suck back into rad any suggestions thanks

 

Get it checked for combustion gasses in the coolant.