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I drive a 1994 Hyundai Excel and recently, after parking the car, I heard the coolant boiling in the reservoir. Also noticed while driving that it was unusually hot inside the car. Meanwhile, the dashboard gauge was normal--right smack in the middle. I've read that it could be as simple as replacing the radiator cap to the thermostat to something more serious. Any thoughts?

By the way, where is the thermostat located?
 

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The thermostat housing is part of the inlet manifold and is located on the right hand side, could be your problem and best to swap it (follow the big hose from the radiator) and make sure you use a glycol mix at the correct percentage, best to drain and refil the system taking special care to release all the air from the system, don't forget leave the heater valves open when you drain and keep squezzing the hoses until all the air is out, I live in NZ and I use a 50% antifreeze mix (water/antifreeze)
 

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if your alternator / water pump belt breaks the car will still run but will overheat quickly. (and not charge, but the pressing issue is the heat) Check this belt on the far driver's side of the engine to see if you have a cheap fix on your hands.
 

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i bought a 1998 hyundai excel. I am not sure about what the previous owner using in coolant, I saw water in it and i am also using tap water, yesterday i saw rust on the coolant pipe. Please tell me how i can rectify the problem. I dont have owner manual as well.

I am looking for some expert suggestion to resolve the same.
thanks
 

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i bought a 1998 hyundai excel. I am not sure about what the previous owner using in coolant, I saw water in it and i am also using tap water, yesterday i saw rust on the coolant pipe. Please tell me how i can rectify the problem. I dont have owner manual as well.

I am looking for some expert suggestion to resolve the same.
thanks

You should be filled with 50/50 antifreeze/distilled water.

If there is rust you need to clean it out. Cooling system cleaners are pretty common and cheap. What I do is add it and drive for a day.

Then drain the system and fill with distilled water. If it is really rusty add some more cleaner and drive a bit.

The drain, refill with distilled water again. Drive a bit. Drain and then fill with 70/30 antifreeze/distilled water.
 

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I had same problem with my 98 X3. Temp gauge was fine but coolant overflow bottle was boiling. It wasn't a heating prob as such but was building up a lot of pressure. This was a result of the a/c fan not working which is attatched to the radiator next to the thermo fan. So when the car is stationary in a hot day, it's struggling for airflow with only one fan. Maybe check to see if they both working and always use manufacturers recomendation with oils and coolant. Use distilled water only. Happy car, longer life. Hope this helps.
 

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If your cap is loosing pressure the coolant will boil at a lower temperature. eg a 15 pound cap raises the boiling temp to 120 deg C. Cheap starting point.
 
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