What makes this not regenerate?

I am making a regenerating race car when I step on a brick, however when the car's seat is at the same place as it was when you regen it, it deletes the car then spawns a new one. Thanks to Ki11aRoboTech for the regen button. The problem is, when I step on the button (it used to work when I didn't edit the code) it does nothing, no matter what. Code:

--Made by Ki11aRoboTech, just group with the model to get it to work.  This button also works for planes.
--Do not change anything besides the lines mentioned below.Again,Group it to anything you want(Cars,Trains,Planes Etc.)

model = script.Parent.Parent--Indicates that the script interacts with the model the button is grouped with.
messageText = ""--If you want a message to appear upon pressing, type it here.

message = Instance.new("Message")
message.Text = messageText
backup = model:clone()
enabled = true

function regenerate()
    message.Parent = game.Workspace
-- Part I edited
if model.VehicleSeat.Position.X == -161 and
   model.VehicleSeat.Position.Y == 11.5 and
   model.VehicleSeat.Position.Z == 159 then
    model:remove()


    wait(3)--Change this number to display the regen message as long as you want in seconds.

    model = backup:clone()
    model.Parent = game.Workspace
    model:makeJoints()
    message.Parent = nil

    script.Disabled = true
    script.Parent.BrickColor = BrickColor.new(26)--Black
    wait(5)--Change this number to change the time in between regenerations via the button, in seconds..
    script.Parent.BrickColor = BrickColor.new(104)--Purple
    script.Disabled = false
end

function onHit(hit)
    if (hit.Parent:FindFirstChild("Humanoid") ~= nil) and enabled then
        regenerate()
    end
end
end
        wait(3)--Change this number to display the regen message as long as you want in seconds.

    model = backup:clone()
    model.Parent = game.Workspace
    model:makeJoints()
    message.Parent = nil

    script.Disabled = true
    script.Parent.BrickColor = BrickColor.new(26)--Black
    wait(5)--Change this number to change the time in between regenerations via the button, in seconds..
    script.Parent.BrickColor = BrickColor.new(104)--Purple
    script.Disabled = false
end

function onHit(hit)
    if (hit.Parent:FindFirstChild("Humanoid") ~= nil) and enabled then
        regenerate()
end
script.Parent.Touched:connect(onHit)

--Remember To read EVERYTHING on this button that includes the top >_> Edit it only for Pros.

Done.