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Old Apr 29, 2016 | 10:23 AM
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Default Overheating Issue

2014 M7 Convertible; 55K miles - I had one overheating event a while back. The dealer found nothing. Since then, I occasionally see the temperature gauge rise, (to maybe 230F) when I am stuck in stop and go traffic.

Has anyone found the cause of this yet?
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Old Apr 29, 2016 | 02:26 PM
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Could be something as simple as the thermostat. Or it could be the electric fan isn't kicking in like it should (which is my bet). Good luck.
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Old Apr 29, 2016 | 02:41 PM
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230 is normal operation for these cars. Even on the C5s the high speed fans didn't kick in until 228 or so. The LT motors are designed to run hotter for emissions.
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Old Apr 29, 2016 | 02:48 PM
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Originally Posted by Tool Hoarder
230 is normal operation for these cars. Even on the C5s the high speed fans didn't kick in until 228 or so. The LT motors are designed to run hotter for emissions.
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Old Apr 29, 2016 | 03:07 PM
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Originally Posted by Tool Hoarder
230 is normal operation for these cars. Even on the C5s the high speed fans didn't kick in until 228 or so. The LT motors are designed to run hotter for emissions.

Really? My car has never been above 200 degrees (Wet Sump LT1). And, I live down here in hot, sunny, FL. Well maybe my gauges are broken. That would then be the first problem ever with the car.

Last edited by BladeSilver2015; Apr 29, 2016 at 03:08 PM.
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Old Apr 29, 2016 | 03:50 PM
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Originally Posted by BladeSilver2015
Really? My car has never been above 200 degrees (Wet Sump LT1). And, I live down here in hot, sunny, FL. Well maybe my gauges are broken. That would then be the first problem ever with the car.
Sitting in stop/go traffic in hot weather?
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Old Apr 29, 2016 | 05:17 PM
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Originally Posted by cleo299
2014 M7 Convertible; 55K miles - I had one overheating event a while back. The dealer found nothing. Since then, I occasionally see the temperature gauge rise, (to maybe 230F) when I am stuck in stop and go traffic.

Has anyone found the cause of this yet?
I have a 16 1lt a8 and live in Las Vegas the highest temp. I have seen so far is 190. That's on a hot day in traffic. My prior Vette a c5 zo6 would run 240 in same conditions. The c7 is fourth vette I have owned and the first to run cool on hot days.
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Old Apr 29, 2016 | 05:33 PM
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Originally Posted by jgzo6
I have a 16 1lt a8 and live in Las Vegas the highest temp. I have seen so far is 190. That's on a hot day in traffic.
I live in S. LA and last summer my 2015 (A8, wet sump) never exceeded 200°, even in summer traffic, with 195° the normal temp when the thermostat is fully open. This seems to be a pattern for '15 models and later, which has led to some speculation that these cars have re-configured thermostats and/or software compared to the '14s.

Last edited by iclick; Apr 29, 2016 at 05:34 PM.
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Old Apr 29, 2016 | 06:30 PM
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Originally Posted by Tool Hoarder
Sitting in stop/go traffic in hot weather?

Yup. Under all conditions. Same experience as iclick and jgzo6.
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Old Apr 29, 2016 | 07:48 PM
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Originally Posted by iclick
I live in S. LA and last summer my 2015 (A8, wet sump) never exceeded 200°, even in summer traffic, with 195° the normal temp when the thermostat is fully open. This seems to be a pattern for '15 models and later, which has led to some speculation that these cars have re-configured thermostats and/or software compared to the '14s.
Same here 2015 A8 wet sump. never been over 200 and I live in sunny hot FL.
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Old Apr 29, 2016 | 08:18 PM
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Had overheating problem last Friday on Rt 4 outside of Orlando. Was in stop and go traffic for approx. 20 minutes. Instrument panel lite up and chime started to ring. Message appeared on instrument panel the car was overheating and that A/C was being turned off. Temp was showing 232. 30 seconds later A/C come back on and temp was down to 210.
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Old Apr 29, 2016 | 09:20 PM
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Originally Posted by gpasvet
Had overheating problem last Friday on Rt 4 outside of Orlando. Was in stop and go traffic for approx. 20 minutes. Instrument panel lite up and chime started to ring. Message appeared on instrument panel the car was overheating and that A/C was being turned off. Temp was showing 232. 30 seconds later A/C come back on and temp was down to 210.
Is this indicative that the auxiliary cooling fan came on and did its job? 30 seconds doesn't seem to be long enough to cool the system by 20 degrees.
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Old Apr 29, 2016 | 09:32 PM
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When running AC in hot conditions with stop and go traffic ALWAYS set the AC to recirculate mode. This improves cooling effectiveness and efficiency because it isn't mixing hot outside air with the cabin air and this reduces the amount of heat being dumped into the AC condenser which is in the cooling stack ahead of the radiator.
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