im running a homemade setup on my stock b18a.. using a civic single core rad.

does this mean i have a blown headgasket?

 

Its cause you change the boiling point of the fluid when you take the rad cap off and then the fluid blows out.

 

keep in mind i can take the cap off days after last running the car.. and it still blows out.

 

Could be a block in the system. How old is the radiator? Lines? Motor?

 

rad is brand new. motor has 156k.

lines are as old as the engine.

could i possibly have air in the coolant system from when i changed the radiator?

 

I know you said it's new but you might want to try another radiator cap. If the headgasket was blown I'd imagine your radiator would have air in it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by djay86 &raquo;</TD></TR><TR><TD CLASS="quote">keep in mind i can take the cap off days after last running the car.. and it still blows out. </TD></TR></TABLE>
haha i was about to say...taking it off right after running it is bad

 

so does anyone else have this problem?

 

I did. After a flush and changing out a few spongy lines/hoses, my problem went away. Just my .02, though.

 

which spongy lines and hoses?

when doing a flush do you just open up the bleeder on the head, and keep the rad full?