Dandy. That implies the radiator is not giving up the heat to the surrounding air and the heater core is doing that instead. Either the fan is not turning on or the cooling fins between the tubes in the radiator are corroded away. A 2005 model shouldn't really have a corroded radiator yet so be sure the fans are turning on. If that is the problem, it won't overheat on the highway. It will if the radiator fins are corroded, (or plugged with a butterfly collection).
Feel the top radiator hose too. It should be too hot to hold onto for very long. If it's not, coolant isn't circulating fast enough through the radiator. Feel all areas of the cooling tubes if you can reach them to see if there are any spots that are significantly colder than other areas. If there is, some of the tubes are blocked.
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Friday, October 26th, 2012 AT 11:35 PM