I just did a coolant flush by pouring water in the rad with the small drain plug removed at the bottom of the radiator while the car was started. While doing this i did notice that when i started the car cool water was coming out of the top very slowly with my finger over the overflow outlet. After it warmed up it dropped as the thermostat opened and i shut it down right afterwards. All hoses are new as well as thermostat and water pump. Other than the coolant my car leaks nothing, and only smokes a little bit of grey smoke upon start up after its sat for atleast a day. One of my friends suggested bypassing the heater core to test to see if its some sort of blockage in the heater core, does this sound like something worth doing and are there any other tests or things i should be checking. Any new info to help figure this out is much appreciated!
Also there is no other blackish or anything other than green coloring to my coolant and i have a koyo rad. Just throwing any bit of info out there i can think of to help diagnose why my overflow is becoming pressurized. Oh and the hole right at the top of the tank has been plugged by someone, is this ok or should i drill it out?
Modified by demonyoka420 at 5:42 PM 8/20/2008
