Not Ranked
Tan,
I drilled mine when I was having difficulty burping the system last year. I don't think drilling helps you run cooler per se, unless your overheating problem is due to a trapped air pocket.
Even after successful burping, the car ran hot. Dave B. suggested that I run Evans coolant, and that definitely helped until I blew a hose, lost it all and decided not to spend the $ to replace it. Finally, I installed a fill tank and now run about 50/50 distilled water/anti-freeze.
Since that mod, it's been pretty rare for the engine to run hot enough to turn on the fans.
Chuck
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