Low Coolant Light
Corvette Enthusiast
Joined: Oct 2007
Posts: 6,795
Likes: 2,717
From: So. Cal.
2025 C7 of the Year Finalist- Unmodified
2024 C7 of the Year Finalist - Unmodified
2023 C7 of the Year Finalist - Unmodified
You need to "pack your radiator". I do it by running my engine after warmed up at about 1500 rpms with the cap off and adding aditional coolent then. Put cap back on before you let rpms drop
Le Mans Master
Joined: Apr 2005
Posts: 6,413
Likes: 9
From: The Old Dominion
On an '87 it's pretty easy to look down the radiator neck, look at where the sensor is mounted, and judge if the coolant is above it. If the sensor is in coolant and the light is on, you either need a new sensor, or it needs to be cleaned. Coolant sludge can get stuck in them and they won't work properly.
I assume you mean the light is always on, or does it come on while driving?
I assume you mean the light is always on, or does it come on while driving?
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
THe sensor is just a little blade of stainless. DO NOT CHANGE THE SENSOR.
Try looking for a cracked hose that goes from the radiator to the overflow tank. If you add water/coolant, and it ends up in the overflow, it's either a leaky hose somewhere on the engine, or a bad cap.
Try looking for a cracked hose that goes from the radiator to the overflow tank. If you add water/coolant, and it ends up in the overflow, it's either a leaky hose somewhere on the engine, or a bad cap.
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
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Mine flips out occasionally.
Most of the "false positive" lites have gone away since I've flushed and reloaded with distilled water.
Packing makes a BIG difference too!
Most of the "false positive" lites have gone away since I've flushed and reloaded with distilled water.
Packing makes a BIG difference too!
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