local overheat = 0

function overheatCheck()
  if getControlState("vehicle_secondary_fire") then
    -- minigun is active, adding the heat:
    overheat = overheat + 1
  else 
    -- minigun is inactive, cooling down to 0: 
    overheat = math.max(overheat - 1, 0)
  end  
  -- check for overheating/cooldown, toggle controls accordingly:
  if overheat >= 1000 and isControlEnabled("vehicle_secondary_fire") then
    toggleControl("vehicle_secondary_fire", false)
    outputChatBox("Minigun overheated!", 222, 0, 0)
  elseif overheat == 0 and not isControlEnabled("vehicle_secondary_fire") then
    toggleControl("vehicle_secondary_fire", true)
    outputChatBox("Minigun is back!", 0, 222, 0)
  end
end
addEventHandler("onClientPreRender", root, overHeatCheck)