2 links
Automotive Overheating Troubleshooting
troubleshooters.com
If you keep a car long enough, you'll get cooling problems. The bad news is that overlooked, ignored or unchecked, cooling problems lead to ghastly expenses. The good news is that…
How Stuff Works: How Car Cooling Systems Work
howstuffworks.com
Tutorial with pictures and animations, including the description of the wax in a thermostat, with related links.