The car overheated once and now it continually runs about mid range on temp gauge. I have no heat when it is turned up to 90 inside the car, it is running great but not sure where to start. I have checked coolant level and also pressure tested everything there is fine. I have ordered a cylinder head temp sensor and a heater core, as well as a new thermostat. pretty sure its not just a thermostat.
View 14 RepliesA friend was driving my 2003 Elantra XD GT and he said the car overheated - CEL came on and then he pulled over. When he tried to restart it would nearly start but was undrivable. I put the handy - dandy bluetooth reader and android software in my android phone and it's giving me:
P0117 Engine Coolant Temperature Circuit Low Input
P0302 Cylinder 2 Misfire Detected
Also I've had this car for only about 16 months - did notice a bunch of clay buildup from 'stop leak' side the radiator. What I need to get it running again? I'm thinking:
theromastat & gasket
spark plugs
fuel filter
Here are the details on the error codes:
P0117 Hyundai - Engine Coolant Temperature Circuit Low Input
Possible causes
- Low engine coolant level
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor circuit poor electrical connection
Read more: P0117 Hyundai Engine Coolant Temperature Circuit Low Input OBDII Engine Light Trouble Code
P0302 Hyundai - Cylinder 2 Misfire Detected
Possible causes
- Faulty spark plug 2
- Clogged or faulty fuel injector 2
- Faulty ignition coil 2
- Fuel injector 2 harness is open or shorted
- Fuel injector 2 circuit poor electrical connection
- Ignition coil 2 harness is open or shorted
- Ignition coil 2 circuit poor electrical connection
- Insufficient cylinder 2 compression
- Incorrect fuel pressure
- Intake air leak
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I changed the T-Stat, no luck. I took the radiator out and flushed it. It seemed to flow great too. I had the garden hose on full blast going in the top and it was coming out of the bottom just as fast with no back pressure out the top. So I think the radiator is good.
I'm pretty sure the fan was kicking on at the correct time but just to be sure I hard wired it so it's always on if the key is no, still over heating. Compression test shows 200, 209, 209, 211. That's pretty good right?
Just to be sure that the exhaust was not leaking through the new head gasket and heating up the coolant I did a liquid block test. Where you suck air out of the radiator cap and then it goes through a chemical which will change color if it contains exhaust gases. Not only did the liquid not change color, it was very hard to get any air out of the radiator, indicating that the system is tightly sealed correct?
The car is not loosing any coolant. I changed the coolant gauge sensor as well, still shows overheating.
Before I changed the sensor out I bought a thermometer and put it in the radiator. I was able to leave the cap off even after it started to get hot. The coolant did start to rise a little but I just bled it off from the drain plug at the bottom as it got higher, making sure to leave it full and not get any air. And the temp stayed below 200. This made me think that it was not overheating and thus the new sensor. This was not the case though. I realized that the coolant coming from the engine was very hot and then going into the radiator where it could cool down via my always running fan and then go past my thermometer.
The heater works great and even cool the engine down. This means that the heater core is not blocked and that the water pump works correct?
So after all of this I decided that there must be something blocking a coolant port. SOOO I took it all apart again only to find no blockages. I can see very well down into the block and fairly well through the cooling ports on the head and everything looks fine.
I also checked out the water pump and that looks great. Still in great shape and the bearing is not worn at all.
There was only ONE thing that was wrong on the engine (that I found) and that was the throttle body gasket. It was put on the wrong way so as not to fully block that air passage that I believe is pulled from the block into the throttle body. this could cause overheating?