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Add Coolant light keeps coming on..

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Old 08-26-2008, 01:45 PM   #1
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Default Add Coolant light keeps coming on..

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
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Old 08-26-2008, 02:22 PM   #2
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CHeck level, if its up on coolant, then its a sensor. LT1's were famous for this.
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Old 08-26-2008, 04:21 PM   #3
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happened on my lt1 and my ls1. i just unpluged it and kept an eye on it.
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Old 08-26-2008, 09:07 PM   #4
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its common..just ignore. lol
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Old 08-26-2008, 10:47 PM   #5
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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.
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Old 08-27-2008, 06:50 AM   #6
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Same thing just happened to my '99. Time for a new coolant level sensor.
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Old 08-27-2008, 11:39 AM   #7
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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.
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Old 08-27-2008, 12:28 PM   #8
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where is the sensor located?
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Old 08-27-2008, 03:17 PM   #9
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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?
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Old 08-27-2008, 03:28 PM   #10
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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.
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Old 08-27-2008, 04:20 PM   #11
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Anyone try cleaning theirs yet? I wonder if the light will go away after a cleaning.
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Old 08-27-2008, 04:26 PM   #12
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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.
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Old 08-28-2008, 03:01 PM   #13
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Quote:
Originally Posted by samson_420 View Post
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: http://www.wellsmfgcorp.com/pdf/Counterpoint2_2.pdf 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.
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Old 08-28-2008, 07:16 PM   #14
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Quote:
Originally Posted by wssix99 View Post
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 ..now i always check it when i have the hood up
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