positon = position + vector3 works in roblox studio but not in the roblox client?

for i=1,70 do
print("e")
script.Parent.Parent.Door.Position = script.Parent.Parent.Door.Position + Vector3.new(0,0.08,0)
wait()
end

so, im wondering why the loop works but the door isnt moving in client, it prints e 70 times but the door doesnt move, remember that its in a script, not localscript

The problem is that you are using Vector3 instead of CFrame. CFrame usually works MUCH better than Vector3 for movement. Although Vector3 is a good way to make parts enlarge themselves.

Use this script:

local door = script.Parent.Parent.Door
for i=1,70 do
	print("e")
	door.CFrame = door.CFrame * CFrame.new(0,0.08,0)
	wait()
end