My hyundai tiburon keeps running hot even after i have changed the thermostat and housing, water pump, and a mechanic said nuthng looks wrong with my radiator. what else can make it run hot?

1. Stuck thermostat
2. Low on coolant
3. bad water pump..

(#1 is best bet). .. FLUSH entire system when replacing the thermostat... check the hoses for wear..(they wear out from the inside.. look for bubbling, cracking, being soft inside.....replace if any questions...(not fun being stuck because of a $10 hose..!!!)

http://www.hyundai-forums.com/grandeur.../111323-please-help-where-my-thermostat.htm..
Hyundai XG350 Thermostat
Upper Lower Radiator Hoses Thermostat Replacement Hyundai Tiburon 2001 2008

check the oxygen sensor
chech the exhust system

the heater core could be stopped up not letting the liquid circulate or if there is a switch or a thermostat in heater hose it may be broke not letting the coolant flow .radiator cap bad .all these things can make the system lose a little coolant at a time until it is to low to cool then it will run hot & boil the rest out.check these things.i wish you luck all things can be a pain in the astric if you know what i mean

are the cooling fans running? is it loosing water from exhaust or in the oil check these things water is going somewhere

With the motor cold, I would remove the drive belt and try to turn the water pump pulley by hand. It should move freely and only make a gurgling noise like water moving inside the motor but should not make any metal on metal noise if it's working properly. This is likely your cause. The water will only weap out of the pump when the shaft of the pump is turning thus the intermmittent leak when you park.

Also the radiator cap was probably removed to perform the leak check but you have to inspect the radiator cap itself. If the o-rings in the cap are worn you could lose pressure in the system and even though you might not see the liquid coming from the cap it could be shooting out through a rubber hose near the cap. If the water pump checks out I would try a new radiator cap.

You have a blown head gasket.This is a job that needs to be repaired by a trained technician.Sorry.

If it's overheating it will lose antifreeze.I would change the thermostat first and see it it solves the overheating problem if not then worry about the water pump. Thermostats are only $7-10.

If you follow top radiator hose, it will lead you straight to the thermostat on the engine. It is inside the housing that the hose attaches to.

yes in this case it is correct, the reason is that the water pump and the timing belt runs toghter.. you dont want to change one without the other..

If the replacement thermostat is good, and installed properly, then the temp sensor might be bad. I hate to tell you ($$$$$) but waterpump could be bad (more expensive)