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So I’m driving home and I’m about 30 seconds from my house driving slowly in my neighborhood. I look down at my gauges and notice my temp guage is all the way at the Hot side. I shut the cat off immediately and coast to a stop. I wait a minute then start it up again so I can park it in my driveway. It stays at normal operating temp the entire time. I let it run for little bit and there’s no temp spike what so ever. My question is what caused this? I did top up my coolant a couple days ago and overfilled it by accident in the overfill tank. Would that be the problem?

 
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Did you recheck coolant levels?

 
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yes I just check and the radiator is full. I talked to a mechanic at my work and he said I could be the fan. I did recently install a new ground I found at the junkyard that was in good condition. The old
oem one I had was very frayed (the main ground by the thermostat)

 
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Alright so I did some tests and I’m stumped. I marked a fan blade and drove it around at operating temperature (fan worked fine). I’m getting heat from the vents and the car is warming up properly (thermostat should be fine). No viable leaks from the rad, thermostat housing, water pump or any lines. I drove the car at about 4,000 rpm for a min and the slowed down to lane way speeds at about 20km and 1,500 ish rpm (car didnt overheat). Doesn’t over heat at idle I let it idle for 20 minutes. Would it have something to do with the weather? It’s snowing and cold outside and it overheated when it was a warm day at 14 degrees. Any help would be much appreciated

 
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Bump

 
Rep Power: 224

Are the radiator or condenser fins packed full of mud/dirt/debris or all bent up? Little to no air flow through the radiator will cause overheating. This would be my guess if you verified all the below. That or the thermostat is only partially opening.

-Radiator is full of coolant.
-Reservoir is not overfilled.
-No coolant leaks.
-Radiator fans are working (really only matters if it's sitting idling for a long time).
-Heat inside the cabin works as it should.
-Lower radiator hose is warm meaning the thermostat is opening.
-Using a scan tool, the coolant temperature is reading properly from the ECU/PCM.

There should be airflow through the radiator when driving which could move the radiator fans. So marking one, going for a drive, getting back and seeing it moved is not a valid test. The radiator fans won't even run when driving (normally).