Engine overheated last night at McDonalds drive through. Need help diagnosing. - Hyundai Genesis Forum
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Engine overheated last night at McDonalds drive through. Need help diagnosing.

So, the car was running fine all day. I was waiting for my food for at least 10 min. I got it, parked and started eating. Five minutes in I look at temp gauge and its like all way up. I jump out, radiator fan is not on. Looked under vehicle no leaks?! I let the car cool off while I ate. Then opened up the radiator to fill it up. The radiator is already full, but overflow is empty?! Filled that up about half way.

Drove home, car was still getting hot. My house is literally 5 min away by the time I got there the temp was at 220 (Torque app + OPD). This is the middle of the night by the way. Probably 60 degrees outside. So I give up I was so tired I went to sleep. Woke up this morning drove to work. Realized I was not using AC last night. Cranked the AC to full cold and it's working fine and the fan was on!! 30min commute I was reading average of 180 in idle traffic it would jump up to 190.

What should I be looking for?! Where to start?? Which fuse should I be checking. I've used the search function and I'm not getting much help.
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If it's a fuse for the rad fan, the fuse is located in the engine compartment - there's a diagram on the fuse cap, look for the one called Cooling Fan.

If the fan is running and you're still overheating at a standstill, you could have a stuck thermostat or your radiator may not be fully pressurized.

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Originally Posted by TKJode View Post
If it's a fuse for the rad fan, the fuse is located in the engine compartment - there's a diagram on the fuse cap, look for the one called Cooling Fan.
So, I cranked the AC all the way this morning on startup since I had to go to work. Fan turned on, and the car stayed at normal temps during the entire commute. It was 68* outside and I took no highways. Average about 40mph and at least 5 redlights and a school zone. I was monitoring the temp via the OBDii and Torque apps. it would fluctuate between 178-184 until I get to a red light were it would start creeping up until at one point it was at like 195* Still that is pretty normal.

Anyways, I guess with that we know the fan is getting power and it works. I still don't understand why it won't turn on without the AC it's very odd.


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If it's a fuse for the rad fan, the fuse is located in the engine compartment - there's a diagram on the fuse cap, look for the one called Cooling Fan.
The fuse is part of the array of fuses in the engine bay right? I've tried taking that biatch out before it's almost impossible for me. I feel like I'm about to brake it. Do you know how to check the thermostat? How hard is it to get too? And do I have to drain coolant before taking it out?
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Originally Posted by Adeeb Hamad View Post
So, I cranked the AC all the way this morning on startup since I had to go to work. Fan turned on, and the car stayed at normal temps during the entire commute. It was 68* outside and I took no highways. Average about 40mph and at least 5 redlights and a school zone. I was monitoring the temp via the OBDii and Torque apps. it would fluctuate between 178-184 until I get to a red light were it would start creeping up until at one point it was at like 195* Still that is pretty normal.

Anyways, I guess with that we know the fan is getting power and it works. I still don't understand why it won't turn on without the AC it's very odd.




The fuse is part of the array of fuses in the engine bay right? I've tried taking that biatch out before it's almost impossible for me. I feel like I'm about to brake it. Do you know how to check the thermostat? How hard is it to get too? And do I have to drain coolant before taking it out?
Thermostat - it's pretty easy to get to. Follow the upper radiator hose to where it attaches to the engine, unbolt that, and the thermostat is right there.

Fuse - there is a white or yellow fuse puller in the driver side fuse box in the engine bay.
check fuses and maybe replace the fan relay since it's cheap.
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Okay, bet I will change the thermostat today. Thanks bro

But as for the fuse, The fan fuse is in a long single piece like 7-in-1 fuse that looks like a stick of RAM. Dealers price on it is like $100 and its a PITA to take out. Today I am going to change the relay and thermostat and make sure coolant is filled to spec.

This weekend I'll do an oil change since I didn't really trust the shop that did it for me last time. But i'll check it to see if it needs topping off. If anything else happens I'll be back to bother you guys again.
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