· Premium Member
The key is to get the top of the radiator higher than any hoses to the engine, I like the steep hill option, usually safer as far as standing on jack stands and the likes, easier to get to the engine that way, it is still on the ground. Open the radiator cap and remove, start the engine after the fluid is topped off, let the engine warm and open the thermostat, keep topping off the fluid. Rev the engine a few times to force air out of the engine occasionally, and watch the fluid go from the radiator to the overflow. Keep the heater on full blast so the air gets pumped into that little radiator core and doesn't hold air. Not sure about the 2.5 V6, but this works for any engine, any closed hose on the engine higher than the radiator opening itself will always cause a problem, air will go to the highest point in any system, the revving helps push the air through the system to that highest point.