Coolant Overfilling

[robs1280]

So what happens when you overfill the cooling system? I am trying to understand why coolant keeps coming out of what I thought was a bad reservoir cap. Under closer inspection I noticed that there is a little whole on the threaded neck filler neck of the reservoir. When ovetfilling the system ( by the crossover pipe ) id it normal for the coolant to come out of this little hole? No there is no air in system- burped it plenty of times. And the coolant only comes out when I fill water level into what I was thinking was full, but I think I was overfilling. It's either this I have a bad reservoir cap.

 

[stangaholic280]

Pretty sure coolant isn't supposed to be coming out of the cooling system at all. Sounds like that hole might be your issue.

 

[01cobravortech]

Replace reservoir tank.

 

[2004 REDFIRE]

im pretty sure that hole is there so when your cooling system overheats and expands thats where the coolant releases from when you hit the pressure point.(14psi??) for what its worth i just got done porting my s/c. when i put it back together it kept leaking out also. i burped and burped that dumb thing. finally i went cheapest route and replaced cap. NO MORE LEAK. i cant believe it was weak before s/c install but a new cap fixed it.