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Old 07-24-2010, 10:25 PM
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Floyd.Craft
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Default Low Coolant Light

I have a 1987 Corvette and Low Coolant Light is keeps coming on and Coolant is Full? Sensor bad?
Old 07-24-2010, 10:28 PM
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CorvetteMike2024
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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
Old 07-24-2010, 11:01 PM
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Harsh20
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you may have an air bubble. so do like Mike says and pack the system.
if that doesn't stop the light then we do a couple of other tests
Old 07-25-2010, 08:39 AM
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Aurora40
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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?
Old 07-25-2010, 11:41 AM
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RUU
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Check your rad cap too. PO of my car had a repair receipt for that issue.
Old 07-26-2010, 09:10 PM
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coupeguy2001
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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.
Old 07-26-2010, 10:48 PM
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Harsh20
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check the hose from the overflow to the radiator for a clog or thrash in the overflow tank.
Old 07-27-2010, 02:09 AM
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JrRifleCoach
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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!

Old 07-27-2010, 02:37 PM
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1st87
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floyd-same prob last year-just changed the sensor $12.00. p.s. make sure the car is not hot...

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