I have a Koyo radiator mounted in the stock position and my add coolant alarm will sound until the engine warms up. then when I shut it down or let it idle for a while the coolant just pours out of the overflow tank.

 

for starts, search 2 words: overflow tank

 

i seen this problem a few weeks ago on another car. problem came out to be the radiator cap, it was rated at a higher pressure than stock caps and whenever the car got warm coolant poured from the overflow tank...

 

Start by replacing your coolant pressure cap. Sounds like it's not holding pressure.

 

Thanks I'll try that. do you guys recommend the stock cap or the 1.3bar caps?

 

^^ The best advice I can give you is to purchase OEM caps. I had the same problem and I replaced my caps from local autostores. I went through a few of them because none would work. Once I coughed up the $25 bucks for an OEM the problem disapeared.