Had a 1994 Trans Am, but it got stolen, now I have a 1998 Z-28. Both cars had Low Coolant warning lights, always on. Filled the radiators, replaced the sensors, no help. Same for both cars. Seems like a simple problem with some simple fix, but I still have a Low Coolant warning light, on all the time. Any suggestions would be welcome, short of removing the indicator bulb.
Thanks.

 

Probably need to bleed the air out of the system,common problem with these cars especially after servicing the cooling system..

 

Y2Keglide;

Thanks, I should have mentioned that was done, several times. Even parked it uphill on a steep ramp to help the process. Had to chock the wheels then, to avoid torque-locking the transmission in Park.
The problem remains.

 

Here's a link to the best way to bleed these systems. It mentions the LOW COOLANT light at the end.
4th Gen LT1 F-body Tech Articles

 

Corey,

Thanks. I believe that is the process I found and followed. Near the end it says something like "if the Low Coolant light comes on when the radiator is full (and the sensor is new), just unplug the sensor." Well, I guess that is always the last option . . . I may decide to replace the sensor again; even new parts are not always good parts. Otherwise, it could be a pinched wire somewhere, but the warning light does not come on when the sensor is unplugged (so far).

 

When was the coolant drained, flushed and replaced last? The flush is important. As coolant ages it can build up a static charge if you do not flush between changing fluid the acid in the system can cause the new coolant to degrade quickly causing a constant cycle of new coolant aging way to rapidly. The "flush" is a base that will neutralize the acid in placed that don't drain like the heater core.

Don't get me wrong, this is a reach and it is rarely a problem but if you magnetize the sensor it will effects its function and I have seen coolant generating a full volt of power.

You can check your coolants electrical out put with a volt meter. Just be sure the motor is running and a little warm.

 

Gorn,

Thanks. Good to know. Live and learn. The "flush" I did was with plain water, so I will try it again with a product this next time. Didn't know the coolant could make voltage, but I will check that, too.
Right now, we are knee-deep in snow, so it will be a while before I get back to the Low Coolant warning light.

 

If you check it rule of thumb is above .3 volts it should be serviced.

 

Gorn,

That's good to know, too! At least I will not be shooting in the dark. Thanks again.