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

Low coolant light stays on

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Old Jul 22, 2009 | 01:25 AM
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Default Low coolant light stays on

The 'low coolant light' stays on in my 89 Coupe. There's sufficient coolant in radiator and overflow reservoir. Is there a sensor I could check and if so where is it located? Any other ideas?
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Old Jul 22, 2009 | 03:31 AM
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Directly below the radiator cap on engine side of radiator.Has single green wire running to it
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Old Jul 22, 2009 | 08:39 AM
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Could also be an air pocket trapped in the system. Have you opened the bleed valves (if so equipped) or "burped" the system?
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Old Jul 22, 2009 | 09:34 AM
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Originally Posted by onedef92
Could also be an air pocket trapped in the system. Have you opened the bleed valves (if so equipped) or "burped" the system?
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Old Jul 22, 2009 | 10:02 AM
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Watch out if you take off that sensor !!!
i found that cable was leaking (i didn't think anything) and i pulled it
while the car was HOT !!!! WOW...it throwed out all the coolant
i got hot coolant in my eyes ! thank god it wasn't that hot but it messed the whole engine
bay ...so don't take it apart if you are going to while HOT !!!!!
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Old Jul 22, 2009 | 10:38 AM
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FYI, some of those sensors are a little post inside a cylinder. They work by measuring if the circuit is closed by conductive coolant (as far as I can tell). Sometimes the center post will get sort of cruddy and just needs to be cleaned off.
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Old Jul 22, 2009 | 02:06 PM
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Default I

Originally Posted by rodj
Directly below the radiator cap on engine side of radiator.Has single green wire running to it
thought the sensor was in the tank by the firewall not in the radiator (on my '91)
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Old Jul 22, 2009 | 02:23 PM
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Default Burp the Radiator

Here is a good post concerning your issue:

http://forums.corvetteforum.com/c4-t...-do-wrong.html

This is L98 specific and may not apply to our fellow LT1 owners.

Best of luck.
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