Radiator losing coolant. No water in the oil. No apparent leaks. Car wont start sometimes after it has been ran awhile. Changed the thermostat. Plugs & wires as well. What is wrong?


Asked by Sep 26, 2014 at 10:15 PM about the 2002 Hyundai Elantra GLS

Question type: Maintenance & Repair

5 Answers


Sounds like head or intake gaskets. Have it pressure tested at a REPUTABLE mechanic.

2 out of 2 people think this is helpful.

Yep same here.


Blown head gasket. Usually. Thousands of dollars. Sorry.


It does sound like a bad head gasket, for about 40 bucks you can get a test kit for the radiator. it involves pulling some air from the radiator through a test fluid that will detect combustion gasses in the cooling system. Not that hard to do, just follow the instructions on the kit. there are some good youtube vids on that too.

1 out of 1 people think this is helpful.

I have owned several Hyundai's from Santa Fe to Elantra(4). All of them would start experiencing coolant loss with no trace of where it would go. I consulted my Hyundai Dealer Shop Manager. Very bright individual always puts me on the path of issues that Hyundai has. This issue involves the "spring loaded" Hose clamps for the upper hose,bypass hose and lower hose. They get weak with time and the hose hardens with heat and age. Suggest doing the following. Thourughly fluff the system. First remove all hoses from engine and radiator. Obtain new hoses. New worm screw clamps and replace the thermostat. Fill the system with proper mixture of coolant. Allow it to run until hot then re- torque all of the hose clamps. Make sure to clean out the overflow bottle too and fill it to the proper line. This should cure the disappearing fluid issues. I have hundreds of thousands of miles on all my Hyundai cars. Never had a head gasket issue under normal driving conditions and care.

2 out of 2 people think this is helpful.

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