The radiator is full of coolant but the low coolant light stays on
In most newer chevys, the coolant reservoir is part of the pressurized system. Rather than just holding overflow coolant and relying on the radiator pressure cap to draw from and expel to the reservoir, it is an active part of the cooling system. On these systems, there is a coolant level switch in the reservoir. This will activate if the level in the reservoir gets below a certain point. So it is possible to have a full radiator and still get a low coolant light. Be advised that as the reservoir ages and get stained, it is not uncommon for the low coolant sensor to give false indications of low coolant.
SOURCE: Low Coolant light stays on
Check you coolant resevoir. The low coolant switch is located in the resevoir so if it is low on coolant there, the light will come on. If it is full, it could be that the switch is stuck due to gunk build up in the resevoir. Hope this helps you out
SOURCE: Low Coolant Light Staying on
This car has sensors on it. If the coolant tank is full and the system is working properly, then one of the sensors is bad.
Have the cooling system presure tested to make sure you have no leaks. If test is good, then look to the sensors.
GM has different systems for each car depending on configuration, so it is hard to point to the one that may be bad.
SOURCE: 2000 chevy venture overheating and low coolant
There is a heat sensor located near the thermostat that goes directly into the block. Get a Haynes or Chiltons manual.
The thermostat is probably bad and causing your overheating. If that is not hte problem, then it would probably be your water pump.
SOURCE: I have a 1993 Chevy Lumina 3.1 v6. The low coolant
i had same problem with my lumina it ended up having a blown head gasket. do a compression check and look for a low cylinder on the outside or twq cylinders next to each other that are low.if they are low it indicates a blown gasket. hope this helps
SOURCE: I've been having some problems
Coolant level sensor failures are common. It is located in the radiator tank on the right (passeger) side of the radiator. it looks like the picture below. Also, there has been a lot of problems with the connector for these sensors. (see picture) AutoZone stocks BOTH of these parts. Inspect the connector for breakage, corrosion and insulation peeling off of the wires. If there are no problems found with the connector, then you can probably just replace the sensor.
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