Okay, so I got the newly rebuilt D16Z6 put into my 92' Hatch. Everything is running great except that after I drive a while the coolant reservoir fills up all the way. What the hell could it be? It's starting to over heat a little bit but only after about more than an hour of driving. The radiator is new, the thermostat is new, the cap is new, the head gasket is new, the water pump is new. So what gives? I'm only losing coolant because is leaking out of the top of the coolant reservoir. Thanks. I want every issue taken care of before I boost it.

 

Could be that you just have too much coolant in your system.

 

make sure you're thermo is in the right way and make sure there are no clogs in the system. i hope you changed your hoses, too.

 

Headgasket could be bad, even if it is new. It's unlikely, but you never know.

 

There is a bleeder screw on some honda's near the thermostat housing. Warm up your car and let it idle, the coolant overflow should be between the lines of low and full, fill your radiator to the top and then bleed it. When the bleeder screw stops bubbling air and is flowing coolant, top the radiator off.

 

yeah, I bled it when I slappe dthe new motor in but I guess I could try again.

 

Run the car with heater on full blast and radiator cap open until normal temperature

 

Exactly.