Why does my car keep running hot

Sounds like a possible fluid leak. Top off the oil and coolant, drive around for 5 - 10 minutes, or until the temp gauge registers normal. Park it and place some newspapers under the front end to catch and fluid that drips. If it is a leak, you should be able to tell if it is oil or coolant. Fix or take it to a mechanic.

check your radiator cap as well if its rubber seals r hard that also cause coolant leaks and increase in temperature all so your distributor setting if CDi or Point Distribution it also cause the car to overheat

Could be a number of things, plugged radiator, thermostat, low coolant, plugged ports in block.

most of the time its the thermostat going bad, but also check to see if your radiator fluid is good or need to add more

clogged radiator thermostat water pump... id start thermostat