Need help with my 2013 Genesis coupe

[YaBoiKev]

the car seemed fine when I first turned it on this morning then after I drove a little bit I turned the car off and then about 30 minutes later I turned it on, started to idle rough and popped the code again of a misfire in cylinder 3 but last time it was 3 and 2 then from the drive from my house to my cousins house was okay till I started to drive normally the temp went up and the after I started to drive slow (below 3,500 rpms) it went back to normal temp and then went on high when I was idling at a red light but then went back to normal as I started driving. I tried turning the heater on and it seemed to to blow cold air then the temp went high again, as the heater was blowing and I was driving it started to blow hot air (NOTE: this happens on and off I don’t know why) and then the temperature regulated to the middle. What could be causing this?

 

[LandOfConfusion]

Not sure about the misfire, but the coolant temp could be thermostat, sensor/sending unit, or water pump. Thermostat should be an easy replacement if you want to start with that and go from there.

 

[YaBoiKev]

Not sure about the misfire, but the coolant temp could be thermostat, sensor/sending unit, or water pump. Thermostat should be an easy replacement if you want to start with that and go from there.

I’ll check on that, I looked at my sparkplugs the other day and they were bad so the might be the reason on the misfire.

 

[arcman]

Assuming you checked the coolant level...

Rising temps while stopped could indicate a radiator fan not working. Check to see if it's spinning when the temp gauge goes on the hot side. I would think if the indicator is showing hot, the coolant temp sensor is probably working (unless there's a separate sensor for the fan). Could be a fan controller or motor.

How many miles? Could be a stuck thermostat but you'd think it would stay on the hot side full time.

 

[YaBoiKev]

Assuming you checked the coolant level...

Rising temps while stopped could indicate a radiator fan not working. Check to see if it's spinning when the temp gauge goes on the hot side. I would think if the indicator is showing hot, the coolant temp sensor is probably working (unless there's a separate sensor for the fan). Could be a fan controller or motor.

How many miles? Could be a stuck thermostat but you'd think it would stay on the hot side full time.

Well, the motor has a 56,000 miles and the car itself has 86,000

 

[YaBoiKev]

Well, the motor has a 56,000 miles and the car itself has 86,000

Also, the fan is working too

 

[arcman]

Head gasket? Could cause a misfire. Is it using coolant? Why does it have a newer motor?

 

[YaBoiKev]

Head gasket? Could cause a misfire. Is it using coolant? Why does it have a newer motor?

I slipped a rod lol and I constantly have to fill it with coolant