soo i just slapped on a new d15b7 on my hatch
and when im driving on the street its fine but once im driving like 15 to 20 mintues on the freeway it starts to heat up to the H slowly...
it has radiator fluid and new water pump...
any suggetions or ideas on whats going on
pleaaase help!!!!!!!!!!!

 

is your radiator fan turning on?

 

If it isn't your fan then you could have a clog somewhere keeping the fluid from flowing completely. Turn the car on and squeeze all your coolant hoses to make sure they all have good solid pressure in them. If one of them gives more and easier than the others then you have a clog and fluid isn't flowing through it.

 

That is also another issue. Make sure that you have no air pockets in the system.

 

i have the adiator fan wired to stay on all the time...
and i will try to search for a clog...
thanks for the help...
would taking the thermostat help?

 

try bleeding the system properly first!

 

let the car sit and idle, don't let it overheat, feel the houses if they feel really hard, good chance your thermostate is stuck ... replace it, let it idle see if it still heats up ... i mean a thermostat is only around $10 and about 15min of your time ..