There are a couple things you can do. First you need to check the coolant level. If it's low it could cause it to read hotter than normal. You can do this by looking in your coolant reservoir. It's usually a plastic bottle with a hose going to the radiator. There is a fill line on the side of the bottle that it should be filled to. Make sure you check your owner's manual for the proper coolant.
The next thing I would ask is when you last changed the coolant. There are additives in coolant that break down over time. Most vehicles should have the coolant changed around every 30,000 miles or 2 years. Again, check your owner's manual to see your maintenance schedule. When the coolant gets old it isn't as efficient and can cause the vehicle to run hotter or even heat up faster.
Either way, you want to have this looked at. If the engine overheats it can be damaged. Hope this helps.
〉 Answered on Jan 5th, 2008 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines