View Full Version : Add Coolant light keeps coming on..

08-26-2008, 02:45 PM
Like the title says, that damn light keeps coming on, a couple of days ago i turned on the car and took off the radiator cap to add more coolant but then collant level only went downan inch, the reservoir was completely full also. I waited about 15 minutes while revving up to 2000 rpms occassionaly. The temp gauge has also never gone above 210 since the light started coming on 3 weeks ago. Anyone have any advice? Thanks

08-26-2008, 03:22 PM
CHeck level, if its up on coolant, then its a sensor. LT1's were famous for this.

08-26-2008, 05:21 PM
happened on my lt1 and my ls1. i just unpluged it and kept an eye on it.

08-26-2008, 10:07 PM
its common..just ignore. lol

08-26-2008, 11:47 PM
Mine has not freaked out, yet.

I pulled the sensor when I was doing a flush. The sensor had all kinds of crusty crap in it. I just cleaned it out. From what I have heard on here, that helps also.

08-27-2008, 07:50 AM
Same thing just happened to my '99. Time for a new coolant level sensor.

08-27-2008, 12:39 PM
Yeah I figured it was a sensor since i have kept an eye on the temp gauge mainly and it has acted normal, I'll probably just unplug it or try cleaning it for now. thanks for the help.

08-27-2008, 01:28 PM
where is the sensor located?

08-27-2008, 04:17 PM
Same exact thing here. I was just getting ready to post it. I think the sensor is on the passenger side on the bottom isn't it? How much are they?

08-27-2008, 04:28 PM
Sensor is located a few inches below the radiator cap. GM PN is 10096163 and dealership list is $65 so I'd look elsewhere. My car didn't come with one, not sure what year GM took them off the F body.

08-27-2008, 05:20 PM
Anyone try cleaning theirs yet? I wonder if the light will go away after a cleaning.

08-27-2008, 05:26 PM
I want to try. when I bought my car there was crusty stuff all in on the coolant level sitck and I bet that is the culprit. I flushed the coolant but I bet some good cleaning would do wonders.

08-28-2008, 04:01 PM
Anyone try cleaning theirs yet? I wonder if the light will go away after a cleaning.

It probably depends on the situation. I have read of others having fouled sensors.

My bad sensor came out perfectly clean. Here's an interesting article: It does mention that sludge can cause coolant sensors to mis-read, however I think mine was a thermal failure.

I'm assuming our level sensors are probably just a simple on/off temperature sensor set to a very very low temperature? If so, that would be in line with how mine failed. It would start to work when the engine reached a certain temperature. Over time, that "happy" temperature rose to a higher and higher point until it wouldn't work at all.

08-28-2008, 08:16 PM
Same thing just happened to my '99. Time for a new coolant level sensor.

same for my 99 .. also hooked a rag on the spring thingy while cleaning .. and that son-of-a-bitch popped off and blew coolant every where the next time i drove it i always check it when i have the hood up :D