Hi,
I had the same issues, I would gather to say it is the thermostat.
driver side of engine where in/out radiator hoses connect.
On the upper hose at the engine end
I have a 2002 Elantra and the timing belt was changed by the dealer at 60,000 per the maintenace schedule.
The 2002 Hyundai Elantra has 16 valves.
check or replace thermostat
The 2002 Hyundai Elantra has a 5-speed manual.
The 2002 Hyundai Elantra has an inline 4 engine.
The 2002 Hyundai Elantra is a gas-powered vehicle.
The 2002 Hyundai Elantra runs on regular unleaded.
The curb weight of the 2002 Hyundai Elantra is 2635 lbs..
how to replace a knock sensor on a 2002 hyundai elantra
The height of the 2002 Hyundai Elantra is 4 ft. 8.1 in. (56.1 in.).