I've recently tried installing a skid plate and front splitter to my cruze because I've exceeded my budget on engine mods for the moment so I thought I'd start working on the aero. One problem came to mind... I heard earlier models were recalled because the skid plate from the factory wasn't allowing enough air flow to the engine and the engine would then catch fire! I looked under the car of many other cruzes and just like mine it looks like they literally just took a saw to the original skid plate made from plastic or whatever and cut out a space under the engine. I think the exhaust placement on the engine is the main source of heat but who knows.
I've since then tried coming up with ideas to get around the possibility of my engine catching fire but that calls for more money spending.
One idea I had was a new hood. There's been after market hoods made with vents allowing more air flow into the engine but mainly directed at the intake. I'm not too fond of the look of these hoods tho, and they're way too overpriced.
Another idea would be to add dual fans and take out the stock fan but I'm also not sure how much more that will do.
I've also looked into modifying my bumper and grille myself to allow more air flow through it.
If anybody has encountered this problem as I have or found ways around it I'd like to hear what your thoughts are.