Question about 2003 Hyundai Tiburon

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Hello I have a Hyundai Tiburon 2003 v6gt. My car started overheating when I drove on freeway at 65 mph at 3.5 rpm and also when I'm on acceleration. I brought it to Hyundai dealer then they say my Thermostat was bad then I replaced and there was no leaking on my radiator also cus it I replace it last year. After all those replaced and it still overheat, but the only thing weird that whenever it's overheat the temp meter went up then it went right back to normal. Then I brought it to Hyundai dealer again for them to test drive it but they said everything are normal, they didn't see any overheat problem. They said they they tested drive on freeway any with AC on too but anything still normal. I have no idea what wrong with my car. Anyone please help!!!

Posted by Danysng on


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James McDonald

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You said 65 mph @ 3500 rpm's? The rpm's are too high for that speed. Now, I do not know the drivetrain in a Hyundai, but any GM or Ford will run 65 mph @ 2500 rpm's. Are you sure you are putting the transmission in "D" and not "3"? "D" will be the third click from "P". If you are sure then try this:

Physically look in the radiator under the cap when cool, for coolant level, and check the valve in the cap for sticking. If air is present in the radiator it can't get out, and more coolant can't get in,(from the overflow). Either clean the cap or replace it and check that it is the CORRECT cap.
Radiator fins dirty, clean with a strong stream of water, not high pressure water.
Radiator clogged, try backflushing it, or replace.
Thermostat stuck open or shut, replace it.
Water pump worn out, can no longer move enough coolant, replace it.
Fan shroud broken or missing....
Electric Fan(s) not working, Check the fan, relay, fuse and engine temperature sensor's.
Belt driven fan, belt slipping, fan clutch is bad, fan blades have flattened out.

Air dam under front bumper is gone, loose, or broken. It actually has a purpose other than scraping on the driveway or curbs. It forces air up into and thru the condenser and radiator. If it's loose, airflow can actually push it out of place making it useless or blocking the airflow. Along with that, there may also be a plastic piece attached to the bottom of, and wraps up behind the bumper. If it's loose, airflow can actually push it out of place blocking the airflow. Simply reattach it with 4 or 5 screws.

Also, if the vehicle has A/C and electric fans, one fan is dedicated to the A/C and should come on almost the instant the A/C is turned on. The engine fan will run even with the key off, that is normal. The system is trying to cool itself. Hope this helps.

Posted on Aug 26, 2011

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  • Danysng Aug 26, 2011

    The only thing that I think that the water pumb or the sensor are not good. And about the rpm they said this kind of car is set the rpm like that at Hyundai dealer. Btw I thought it was high too but they said so, then I don't know what to do about it.

  • Danysng Aug 26, 2011

    Btw this car is automatic and manual!!!

  • Seth Malloy Sep 19, 2011

    The RPM's are a bit high...but I have an 03 tib 6-speed manual and that's what mine sits when doing 65 -70... As for the over heating I'm not sure. Even about what woody was saying... Domestic cars are gonna definitely be different than imports.I can say that I notice my car will over heat when I turn on the AC. Some times it comes on even when I don't select it too! I.E. I turned on the vent and the AC light turned on as well. I soon noticed that the engine temp was going up and that the AC light was on... I turned it off and the engine temp went back down to just below the half way point which I assume is normal cause it sits there steady any other time the car is warmed up driving or sitting.

    I would check the water pump because it could be going bad slowly...



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