A common problem with older model Jeeps, it can lead to premature electrical and mechanical engine component failure. (I've already burned through a couple ignition coils and it's stranded me from a failed CPS during the last 2 years).
This mod cools down the engine compartment by allowing trapped heat to escape through holes cut into the hood.
Now, I'm not interested in gaping holes in the hood of my Jeep, but I also don't want to pay $$$ for expensive sheet metal louver panel kits.
*** The classic disclaimer *** This is my own experience. If you want to do this to your Jeep, have fun, but it's on your own responsibility. Don't do something your not comfortable with. I'm not responsible for your actions, or your vehicle, and I'm only responsible for my own vehicle.
That being said, let's roll....
keywords: ( Jeep Wrangler CJ TJ YJ XJ ZJ LJ hot heat engine motor hood Cherokee Comanche 4.0 overheat )
Step 1: Figure Out Where You Want to Put the Holes
One set of holes will go here. Another set (in a future instructable) will go towards the rear sides of the hood.
These spots are the mapped low pressure areas in the engine compartment and yield the best results (I will leave it to you to Google it up).
Try doing an image search for Jeep louvers. You will see there are several patterns. Many patterns have a long thin louver panel that goes along the front edge of the hood.
Mine are different (obviously).
Step 2: Figure Out the Shape
This also helps to lay out the design on the hood prior to doing any cutting.
Step 3: Choose Your Material
Trace the pattern onto the metal. Use a jig saw to cut it along the outide and inside perimeter.
The inside perimeter can be started by trilling a hole for the jig saw blade.
Step 4: Choose / Apply Netting and Insulating Material
You will also want to use the sponge rubber weatherstripping material to put on the bottom of the ring. It will be used to hold the net to the ring and also to keep the metal and plastic from rubbing against the hood where it will be fastened.
Cut some netting the same size of the ring. Cut lengths of the weatherstrip and stick it to the ring.
Step 5: Drill Holes in the Rings
2. Clamp the rings together.
3. Drill the holes just small enough to keep the head from popping through. You'll need to have room to move the fastener around in order to screw it down.
Step 6: Transfer Hole Pattern to Hood
Hold each ring against where you want to, then lightly pressing the drill bit through each hole to the hood.
Step 7: Figure Out How You Will Fasten the Rings to the Hood and Drill the Holes
The size of the drill bit corresponds to which fastener that you decide to use.
Step 8: Cut the Holes
This can be done with a grinder or a jig saw.
Be highly careful....the radiator, hoses, and belts are just below the surface. Raise the hood before cutting.
Make sure not to hit any of the holes....it's easier than one would expect.
Step 9: Paint the Rings and Netting
Step 10: Attach the Rings - Finished Product
Start all screws before tightening them. Also, tighten them all the way and evenly, so the rings are not bent.