1999 Chevy Venture - Cooland Light

JJ962

MEMBER
1999 CHEVROLET VENTURE
2WD
AUTOMATIC

I have 1999 chevy venture with a 4.3L V6 engine. The coolant light is on. I have checked the water level in the radiator and the coolant container. The radiator is full and the coolant container has coolant in it. I have concluded that I must have defective coolant sensor. I have replaced the coolant sensor (in the radiator) and I have still have a low coolant light on. I have unplugged the wire warness connection and test the voltage at the connector. I got 14 volts. I have tried another brand new sensor that I immersed in a cup of coolant and got the same reading, i.E. Low coolant light on when the sensor is emersed in coolant and connected to wire harness. What is the problem here? Any suggestions? Thanks!

Friday, April 22nd, 2011 AT 5:13 PM

3 Replies

JDL

MECHANIC
16,098 POSTS

Is the lite on with low coolant sensor, disconnected?

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Friday, April 22nd, 2011 AT 6:36 PM

JJ962

MEMBER
23 POSTS

No. When I disconnect the sensor from the connector, the light goes off. Actually this is the way I am running the car now since I am sick of this light! I understand I don't have the feedback in case I am actually low on coolant. Thanks for replying to my note.

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Friday, April 22nd, 2011 AT 9:41 PM

JDL

MECHANIC
16,098 POSTS

Coolant level indicators can operate differently on different vehicles. Not sure about yours? I have seen level sensors that would turn on the lite if disconnected. If I understand the wiring on this, there should be no continuity between terminals B and C on the sensor itself. Is there is heating element on the sensor?

In the diagram the yellow wire is voltage, black is ground.

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