The only drain plug in town is located at the base of the radiator.
C4 corvette radiator drain plug location.
Open the hood and remove the radiator surge tank cap located next to the radiator for venting.
This is the time to consider upgrades.
Crawl under the right front side of the radiator and locate the drain plug.
Sorry i don t know the exact location but i think mine is on the passenger side bottom of course.
In this video i go about replacing the original corvette c4 radiator the car came with.
Place a drain pan under the drain plug and then turn the radiator drain plug.
Open the air bleeder screws located at the water pump and.
Some manufacturers are nice enough to give you a belch valve at the top of the heater core perhaps this is the one you d like to use if it isn t there fill the system and pull the top hose long enough to let the air out.
Be carefull with the inside thread of the radiator and have another petcock from the part store on hand when you do it.
In this case i opted to insta.
I have read on similar thread before that there is a risk that the petcock will get damaged when you remove it.