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Old 06-22-2020, 10:16 AM   #1
THATS NO M00N
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Overheating after idling (2011 1LT RS)

This is my first post in quite some time. I'm having an issue with my 2011 1LT RS. This has only happened twice so far. After sitting idle at a drive-thru the engine starts to run hot only after I begin driving again. While sitting idle the car runs at normal temperature. When driving on the highway or interstate no issues occur unless it has been idling beforehand. I've also sat in a parking lot for 20 minutes idling with the AC on and no issues. I've checked and the coolant levels are fine.



I suspect it is bad thermostat, but wanted opinions before I tackled that since I am finding that replacing the thermostat on the V6 can be a bit of a nightmare.



Any input would be greatly appreciated and feel free to ask questions if I have not provided enough details.


Edit:
I should mention that it does cool back off quickly after a few seconds and then the temp fluctuates.
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Last edited by THATS NO M00N; 06-22-2020 at 10:43 AM. Reason: Adding more details.
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Old 06-22-2020, 10:27 AM   #2
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How hot is hot? Boiling over or reduced engine power/no ac warning?
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Old 06-22-2020, 10:40 AM   #3
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The first time it happened I got the overheating warning on the dash. Second time the gauge just went to around 2/3 over.
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Old 06-22-2020, 11:00 AM   #4
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When is the last time you flushed and filled the system? Have you filled/top offed the radiator exclusively with DexCool? If nil to the former and nay to the latter that is a likely suspect.
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Old 06-22-2020, 11:20 AM   #5
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Monitor fan function. With AC on your fans are on all the time. Maybe they don't turn on during non AC operation. Or maybe just ONE is operating.
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Old 06-22-2020, 12:24 PM   #6
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Is your coolant level low? What temps are being displayed on the DIC?
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Old 06-22-2020, 04:05 PM   #7
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Just drove home on interstate and never got over 210. Stopped for gas and when I got in it was 221. Drove home on side streets and topped at 230. It would cool back off to 210 and go back and forth hovering around 215 on the way home (about 10 minute drive). Fluid is at the proper level.
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Old 06-23-2020, 08:09 AM   #8
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Have you drained the system recently? If so you might have air trapped.

I'm not sure about the V6, but the V8 runs very warm. I don't think I ever saw 230 but I did see upper 220's before I had the fan cut-on point lowered.
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Old 06-23-2020, 06:07 PM   #9
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HOT: squeeze your upper radiator hose, for firm pressure. If there is no pressure,
replace the cap on the fill neck at the motor. I thought I had a bad t-stat, turned
out the cap was bad.
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Old 06-23-2020, 07:00 PM   #10
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its gotta be t-stat or fans because of the odd fluctuation. If it were the cap, it would lose coolant. I've idled in the desert with a/c on and never got above 196*.
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Old 06-23-2020, 08:29 PM   #11
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Worst case senario... popped head gasket. Best case senario... bad rad cap.
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Old 06-24-2020, 08:01 AM   #12
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It happened again yesterday after sitting in a drive-thru again. Topped out at 250 shortly after leaving the parking lot. Once I got going it cooled down to 208 and then hovered around 213 the rest of the way home. I think it is the fan because I heard a clicking noise while waiting in line.
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Old 06-24-2020, 08:41 AM   #13
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It is definitely the fans not working. Just sat in the parking lot and got up to 228 and the fans never came on. So does anyone know how to test if the fans are bad or if it's a bad sensor not telling them to come on?
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Old 06-24-2020, 08:48 AM   #14
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Any codes? Any blown fuses? Start the engine and turn ac to max. If the fan runs it is not fan circuit related.
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