C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Fan and SES issue

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Old Aug 25, 2009 | 03:01 AM
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arandy
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From: ceres ca
St. Jude Donor '08
Default Fan and SES issue

I haven't driven my 95 much in the last 18 months. Now I have an issue with the cooling fans setting an SES light. I always start it at least once a week. Lately when the fans come on it sets a SES light.
It started at 230-235 and now its at 190. The fans come on, the light comes on and they stay on even after the temp comes down.
You can turn it off and restart it with no fans or light, but once it reaches that temp it does it again. The book isn't clear on this matter.
I figure it's a sensor, But which one?

Thanks in advance
Randy
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Old Aug 25, 2009 | 04:53 AM
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Originally Posted by arandy
I haven't driven my 95 much in the last 18 months. Now I have an issue with the cooling fans setting an SES light. I always start it at least once a week. Lately when the fans come on it sets a SES light.
It started at 230-235 and now its at 190. The fans come on, the light comes on and they stay on even after the temp comes down.
You can turn it off and restart it with no fans or light, but once it reaches that temp it does it again. The book isn't clear on this matter.
I figure it's a sensor, But which one?

Thanks in advance
Randy
I think you are confusing a symptom with the problem, by default the fans will frequently run when a DTC is set. The first thing to do is pull the code or codes, see the link below.

http://www.digitalcorvettes.com/foru...56&postcount=9

Once you have the code, the next step and the one most people get wrong is troubleshooting to find the root cause. Just because the code mentions a particular sensor does NOT mean the sensor is bad, the code indicates there is a problem in the sensor CIRCUIT.
To isolate and resolve the problem correctly you MUST follow the step by step diagnostic "tree" in the FSM for the code in question. Doing that usually requires some basic diagnostic tools such as a digital multimeter.
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