Cowl Flaps

I hope that this is enough, if not please ask for more.

http://www.stoenworks.com/Tutorials/Cowl%20Flaps%20%26%20Engine%20C.html

If the aircraft is equipped with adjustable Cowl Flaps:

Cowl Flap Position Control - Cowl Flaps are opened during high power/low airspeed operations like takeoff to maximize the volume of cooling airflow over the engine's radiator fins. They are closed during normal cruise flight to maintain normal engine operating temperature and minimize drag.
Cylinder Head Temperature Gauge - Indicates the temperature of the cylinder with the least cooling airflow. A Cylinder Head Temperature Gauge has a much shorter response time than the oil temperature gauge so it can be used to fine tune the engine's power output. Engine overheating may be caused by:
Running too long at a high power setting.
Running too lean on the fuel mixture.
Restricting the volume of cooling airflow too much.
Insufficient delivery of lubricating oil to the engine's moving parts.

Thanks! I'm pretty new to the 'Sim and while the tutorials are really good, it's hard to find a couple things (like cowl flaps).

I'm making all the rookie mistakes (such as feathering too early on landings and trying to land 10 feet off the ground!). But I just landed an Air New Zealand Beechcraft 1900D into Rapid Valley, South Dakota - in a downpour without bouncing - with the crabbing technique. What a rush!

Sounds good, practice, practice, that's the way I'm learning also.
You did a great job with weather like that. 👍

Keeping the cowl flaps closed during descent also keeps you from damaging the engine. It prevents shock cooling which can crack the cylinders, heads, and crankcase.