Continetial GT overheat warning but its not overheating - Rolls-Royce and Bentley Forums
 
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post #1 of 8 (permalink) Old 08-04-2014, 11:26 AM Thread Starter
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Continetial GT overheat warning but its not overheating

Anybody ever has this problem with a 2005 Continential GT ?? The temp gauge looks like it works properly. I start the car and the guage goes up to just under 200. A warning icon comes that says overheating, after driving a bit. If I shut the car off and restart then it goes away. The car doesn't not smell or seem hot at all. Sensor maybe ??

Jonesy
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post #2 of 8 (permalink) Old 08-04-2014, 11:43 AM
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I'd suspect the sensor is going bad, but, you need to be certain you're not having localized overheating (unlikely, but possible).

I imagine that there is one temperature sender for the gauge and another for the warning light, but I don't know this for certain and don't have the technical documentation to confirm it.

You should check with an IR thermometer in the region of the temperature sender for the warning light when it comes on to determine whether localized overheating may be occurring. This can happen if the coolant has not been changed regularly and one of the passages for coolant has suffered corrosion collecting on the inner surface, reducing the ability to transfer heat to the coolant.

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
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post #3 of 8 (permalink) Old 08-04-2014, 11:25 PM Thread Starter
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Thanks, wasn't sure if anyone else has had the same issue or if it was unique to my car. I'll check the coolant and look for a sensor

Jonesy
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post #4 of 8 (permalink) Old 08-05-2014, 03:47 AM
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Hi as it is running VW Software you should be abel to plug it in (obd) and it will tel you what the sensor is doing
Michael

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post #5 of 8 (permalink) Old 08-05-2014, 11:37 PM Thread Starter
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Cool, thanks Michael. I'll try it
Brian

Jonesy
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post #6 of 8 (permalink) Old 11-15-2014, 02:38 PM
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Hi
This is caused by exhaust temp sensor(bank 1 normally)

Common fault
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post #7 of 8 (permalink) Old 11-15-2014, 03:28 PM
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Quote:
Originally Posted by jmolnar View Post
Hi
This is caused by exhaust temp sensor(bank 1 normally)

Common fault
Thanks for taking the time to contribute your knowledge even on "old, dead" threads.

You may be too late to help the original poster, but those who come along later and find these threads via searching will thank you!!

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
~ Niels Bohr


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post #8 of 8 (permalink) Old 03-30-2016, 11:23 AM
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As mentioned previously, check live data via scan tool for initial check - the "plausibility range" for engine coolant temp sensors on early GTs is insane (plausibility could be checked against air temp/radiator outlet by engine management...but isn't). Carry out the check from cold with key on. Anything other that a small deviation from ambient temp suggests a fault coolant temp sensor. Using an oscilloscope during full warmup phase is the ideal check that would catch intermittent issues also.
Good luck!

If you require technical assistance please PM your vehicle's last 5 of the VIN.
M B Jarvie Ltd Glasgow - Your Independent Bentley Glasgow Specialist.

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