The easiest thing to do is an grill block.
Step 1. Buy black pipe insulation from Home Depot or another building supply store
Step 2. Cut the insulation to the width of your grill
Step 3. Slide the open end of the pipe insulation over the horizontal slates in your grill
Step 4. Secure the pipe insulation to the grill with zip ties.
Step by step with pictures:
https://forums.tdiclub.com/index.php...lation.160835/
Alternate: Use duct tape instead of insulation - Choose any color duct tape you want.
Step 1: Clean your grill
Step 2: Cut small pieces of duct tape long enough to bridge the vertical gap between two or more openings in your grill.
Step 3: Stick these vertical pieces of tape to the grill with good overlap to make them stick
Step 4: Run a long piece of duct tape left to right to connect all the small pieces.