I put a new radiator in my car and the cap that came with it leaked so i changed it back to the stock Honda cap, i drove it about 10 miles and i poped the hood and the overflow bottle was boiling. WTF is up with that, it didn't over heat but it only did that with that cap.They were both rated at 1.1

 

ttt

 

TTT

 

was your radiator a oem replacement or a performance aluminum radiator?

 

your engine's probably getting a little too hot. When you had the leaky cap on, it was probably releiving itself through the cap instead of boiling into the overflow bottle. Maybe your thermostat's not opening all the way, or your fan's not coming on or something like that???

 

Performance aluminum, The cap i replaced it with didn't leak before and when i had no other radiator it didn't leak and never boiled over

 

aluminum radiator suppose to have 1.3 cap

 

O, is that like the standard for aluminun radiators

 

yes

 

my hatch did this and it was a thermostat problem, i replaced it and it never did it again. just my $.02

 

good information...im aiming more towards the radiator simply because it only does it with that particular radiator. try the 1.3 cap like that one guy said

 

I'll try the cap it makes sense

 

what if you put a 1.3 cap ona stock radiator??

 

u shouldent, to much pressure. the stock is 1.1 i think