Yes there is a thermostat.If the engine is running rough first thing I would do is a compression test. Hopefully you didnt blow the head gasket from running the engine hot. Potential problems plugged radiator, low coolant level ( if so where is it leaking from) Circulation ( are both radiator hoses hot when warmed up)
If not make sure the radiator fluid is up if there is an air pocket it will get hot some have a bleeder screw to release the air from the top of the engine usually on the therm0stat housing or the radiator. Dont run the car if the guage is climbing to the top. The fan clutch will not spin fast enough with the engine idling will cause overheating. The radiator can have restriction from sludge or metal shavings inside and the flow can be blocked so it will not circulate. The water pump should be checked for play and lea\king dont confuse the play in the fan clutch to the play in the water pump bushing make sure you are watching the pully on the waterpump when you are moving it if it is moving at all your waterpump is shot. Be careful not to open the radiator cap when the engine is hot it will injure you hold a thick towel over the cap to loosen the cap and do it slowly let the air bleed off dont just remove it quickly that will protect you from the hot water shooting out of the cap if you remove it hot.Another place you can leak water is from the hoses or the intake gasket. fill it up check if both hoses are hot if not change the thermostat if still not both hot pull the radiator and flow test it at the radiator shop. check the waterpump play.replace it if it has play in the waterpump bushing or if it is leaking. You c you can do a combustion check on the water and if you fail the test the head gasket is blown.
Yes, there is a thermostat. That's a good place to start.
Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me.
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