Insufficient Coolant SES Code

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Jan 10, 2018 | 02:59 PM

NorthCarolinaExpy

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From: Planet Earth

Insufficient Coolant SES Code

Advance Auto Parts OBDII scan showed a possible thermostat issue since there is no coolant leaking. I am running the original Thermostat (18 years old, 384,000 miles. I'll be replacing the thermostat tomorrow.

Jan 10, 2018 | 04:31 PM

Nicmike

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From: Western AR

No thermostat can be expected to go 18 years without problems. Impressive yours made it this far. Let us know if this clears the code/solves the problem.

Jan 11, 2018 | 06:27 AM

projectSHO89

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From: St Louis

It would help if you posted the explicit fault code instead of an interpretation that's ambiguous (and probably wrong).

Jan 30, 2018 | 01:34 PM

NorthCarolinaExpy

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From: Planet Earth

SOLVED: First time replacement of thermostat and O ring. I am pleased with the mileage I got out of it. 18 years of service and almost 400,000 miles. Several coolant flushes along the way, too. I might just replace the Coolant Sensor while I'm at it at some point.

Feb 1, 2018 | 08:45 AM

arcticatdan

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From: Northeast, WA

Is that the light that is just under the temp gauge? The small round yellow one. I have a 1999 Lincoln Navigator that has that light on.

Thanks,Dan

Feb 1, 2018 | 09:01 AM

NorthCarolinaExpy

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From: Planet Earth

Dan, The light was the Service Engine Soon light (SES) that was glowing on the left side of the instrument cluster. I had someone attach an OBDII scanner to determine a code and it came up "Insufficient Coolant". I suspected the original Thermostat to the culprit since I had already flushed and filled the system with new coolant the previous year. Also, I was not getting any hot air out of the vents. I replaced the thermostat and gasket myself and it fixed the issue of SES light and no heat.
I am still amazed that the thermostat lasted as long as it did.