1995 Cutlass Convertible "low coolant" light blinking
 

So I've noticed a sort of oddball thing on my '95 Cutlass Supreme convertible. The 'Low Coolant" light blinks on and off at one-second intervals, about once a second, yet the coolant level appears to be fine and the temperature gauge stays comfortably below the 200 degree mark. Any ideas what's going on? Should I be worried?

Possible faulty level sensor?

That would be my thought. Try unplugging the coolant level sensor to see if the behavior changes.

The Low Coolant on my Regal also has troubles. It used to stay on all the time, and occasionally go out after the car has been warm started a few times. After a coolant flush, it goes out much more frequently.

The other possibility would be a wiring fault, but that would be apparent if the sensor is unplugged and the light is still doing freaky things.

I don't know if the indication is from a closed circuit or open circuit, but if it is a two-wire connection then it would be easy to test.

I agree. Sometimes a paperclip can be used to test it.

I believe, if you disconnect it, the light should go out.......if you short the connector, the light should be on solid......if it does both of these, it's the level sensor.....

Since this is a Supreme, I think it is located on the passenger side of the radiator....when they get contaminated by old coolant, they fail...so if you replace the sensor, do a flush also....

I think it might have just been a bad connection. I found the sensor, disconnected the wire and then reconnected it. Since then, the light hasn't come back on. I've only had the car a little more than a week, so I'm still figuring out its eccentricities.

Cool, thanks for letting us know how it came out!

The Low Coolant light went back to blinking a couple of days after my last post on the topic and my interim solution was merely to disconnect the wire so I wouldn't be annoyed by it. I ordered a new sensor online for $6.50 including shipping and installed it this afternoon when I got home from work. OnceI got the old sensor out, I could see the problem. It was all gunked up. The same thick gunk was also on the inside of the neck of the radiator. I wiped it out with a paper towel and shined a flashlight down the neck. What I could see of the rest of the interior of the radiator seemed fine. Still, I think a radiator flush is on the near horizon. One tool the service manual and YouTube videos don't mention that's helpful for installing the new sensor is a claw hammer. No, I didn't pound it into place, I used it as a lever, pressing it into place with the flat side of the head. It also helps to take the fender support loose to gain a little more room to access the side of the radiator. Having never put one in before the whole operation took about 20 minutes. I then drove the car around a bit to get the engine up to operating temperature and the indicator light stayed out, so problem solved.

Cool, thanks for the update!