Radiator Full Too Early?
Since you now have a water/cleaner mix in the system, the only way to get the system back to normal is to do a proper flush. You need to drain the radiator, overflow tank, and then remove the two engine block plugs on either side of the engine.
I have some more tips in this thread and other links to threads with pictures of the block drain plugs:
https://ls1tech.com/forums/general-m...el-ground.html
The plugs are a real PITA to get to... This thread is on an external site, but their tutorial is probably more helpful:
http://www.ls1.com/forums/f6/diy-coo...-flush-157898/
When you fill the radiator you want the front of the car to be raised on an incline to force air out of the motor into the highest point in the cooling system which is the radiator cap area.
Fill the cooling system and leave the cap off. Get in and start the car and turn your heater to hot and let the car get up to operating temperature with the cap off.
When the thermostat opens you should notice the level in the radiator goes down and you will need to add more coolant.
The easiest way to burp the system is with a tall funnel. Fill the funnel to a high point and you will see the level drop when the thermostat opens






