Should I go to the dealership to get my car check out?

I cannot tell you for sure what the problem is but I'd be leaning towards the intake gasket on that vehicle. Your best bet is to get the dealer to diagnose the problem and if you don't like their repair cost then go somewhere else to repair it. It'll cost you a bit more on diagnosis but the dealer has the best equipment, training and experience to look at your vehicle.

probably just needs a new thermostat, but your car is never to old for the dealership, most people don't' go there cause they are anywhere from 80-100$ an hr. for labor, but they usually know a lot more about your car that people like midas or jiffy lube. take it to the dealer they can get you fixed up if you can't do it yourself. Or if you have a family friend that is a mechanic ask them to see if they will help you out first try to save you some money.

You're car is never too old to visit a dealership, it's just about the cost. There are some things that can only be fixed by the dealership, but they are always the most expensive route and sometimes it's a matter of fiscal savvy-ness. At what point is it more feasible to get a newer car then to be sinking money into an older car?

Unless the repairs/service is under warranty, I do not recommend going to the dealer. I would recommend finding a reputable auto mechanic for assistance.