low coolant indicator flashing when its hot.

Asked by Attila680814 Jul 24, 2018 at 12:50 PM about the 2002 Pontiac Grand Prix GT

Question type: Maintenance & Repair

The temperature gauge on this 2002 Pontiac Grand prix was always at or
slightly higher of the first long mark. It is about half way to the 210F mark.
Now it is goes up to or over 210, and when it gets close to the 210F the low
coolant level indicator lights start flashing. It is off when it's cold, but start
flashing when its warm up above the usual temperature.
Coolant level is fine, the coolant system wasn't drained for repair or anything,
so it cannot be air pocket in the system.
Cooling fans do not kicks on at or around 210F but they come on when AC is
on or disconnect the ETC sensor. When cooling fans on due to AC the
temperature drops back to the normal level.
I replaced the ETC, but still the same.
The coolant level sensor flashing can indicate other problem than low
coolant level?
A bad coolant level indicator can block the cooling fans to kick on?
I can't figured out what could be the problem.
Anyone else have some idea?
I would appreciate any help.
Thank you!

2 Answers
10

Jamshed answered 6 years ago

Did you ever figure out the problem? I have a '99 GP 3800 and the low coolant light started flashing recently.

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Attila680814 answered 6 years ago

Jamshed: No I wasn't figured out my problem. It isn't my car so I don't know what is going on with it, right know. My friend have it and he wasn't say anything lately. When a low coolant light start flashing, that could be either a low coolant, a failed sensor, or dirty coolant left deposit on the surface on the sensor. In my case, the coolant temperature was going up, where never was before, but when the AC turned on and kicked on the cooling fan, the temperature dropping down. The fan do not turn on, just because the higher temperature! I replaced the coolant temperature sensor, but still have the same problem.

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