Overheating when driving at 80- above Km/H

Asked by Zeeshan ul Hassan Jan 22, 2019 at 05:49 AM about the 2012 Hyundai Elantra GL Sedan FWD

Question type: Maintenance & Repair

I have Hyundai Elantra 2012 basic model.

Yesterday I was driving on a highway at around 100 Km/H and suddenly I
saw that heat bar was higher than the usual. I stopped my car in the side
way and checked if there is any leakage but there was no leakage. Then I
checked the coolant level in the radiator bottle and it was fine. After that I
checked the fan which was working normal. In the evening I took my car to
the mechanic and he checked the car and mentioned that thermostat
needed to be change. I went to the official dealer and purchased a
thermostat and it was changed and radiator was flushed by the mechanic
however radiator pipes were fine. However, I am still facing the same issue,
my car is working normal at 60-70 Km/H however, if I speed up to around 80-
above Km/H it will starts overheating.

JFYI, i recently changed the engine oil and I know that it is not related to the
issue. Can anyone give me an idea what is the exact issue and to whom
should I approach.

Thanks,
Syed

3 Answers

80

Replace radiator cap. If that doesn't help might be a bad head gasket

already changed the radiator cap, still the issue persist. Head Gasket have nothing to do with it as the water in the radiator doesn't change the color or muddy. I will try to check my water pump body may be it is having an issue. I will keep posting till this issue is resolved. Thanks for your suggestion.

80

I'm not sure how many miles or how hard you run your car.the water pump could be another possibility as you stated. I believe the engine you have is a open deck block which coolant runs right outside the cylinder walls.a blown heat gasket could be letting coolant into the cylinder causing it to overheat. It wouldn't mix with oil. But since your levels still shows full if its not the water pump it could be a collapse hose or pinch one.check the small ones as well as it only over heats at high speeds

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