Use a vacuum with a brush adapter to remove dust from the vector drive vents . Install the heat sink cover  to the front of the vector drive. Do not install it on the top of the vector drive. Install the cover . Examine the weather strips on the door for the electrical cabinet. Replace them if necessary.
Make sure the Vector Drive operates correctly: Run the spindle for several minutes. The fan on the vector drive will only operate when it becomes hot.Optional: Add a filter to your electrical cabinet door to decrease the amount of dust that enters the electrical cabinet. Go to parts.haascnc.com. Under Find Replacement Parts, search for your Filter in the category Electrical Cabinet.