You don't need to
remove the radiator cap to fill the overflow.
Remove radiator cap, and check to see that radiator coolant level is low enough to prevent plugging of unit.
With a full - sized beach towel I opened the hood, and
removed the radiator cap, steam and hot water exploded out, gushing over the engine; this is good because pressure release causes cooling.
Not exact matches
Removing the rad
cap revealed the
radiator was empty (again).
Air lock in coolant system (with engine cold and shut off,
remove coolant filler
cap (fill to water level if required) then squeeze bottom
radiator hose several times until no air bubbles come from the place you filled with water.
The standard recommendation is to allow the engine to cool before
removing the
radiator or coolant reservoir
cap.
He informed me that he cleaned the passage of the coolant in the engine but I should expect some oil in the
radiator for three days after cleaning and I can
remove it by opening the
cap and use some tissue to
remove it.