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#1 User is offline   TransAm99 

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Posted 29 January 2010 - 04:02 PM

I was driving today and the low coolant light came on. I got some anti-freeze, and filled the reservoir to the top (on accident). I let it sit for about 2 hrs and checked it to see that it had dropped about 8 inches. I then checked the radiator and it was full to the lid.

But when I started the car up again, the light still came on. Any ideas on why it is still on? Ive put nearly half the jug in there.
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#2 User is offline   TransAm99 

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Posted 29 January 2010 - 04:14 PM

I have read in the manual that it may stay on after filling, but turning the car off and then restarting it should turn the light off. Ive have done this many times with no luck.
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Posted 29 January 2010 - 04:23 PM

It's the low level sensor, and they are known to go bad. If you aren't losing water, I wouldn't worry about it. It takes about 10 minutes to replace.
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#4 User is offline   TransAm99 

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Posted 29 January 2010 - 04:32 PM

Good deal, I will see if it changes when I'm on the road. I just didn't want to be stuck an hr away from home with an overheating car at 9pm.
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#5 User is offline   Injuneer 

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Posted 29 January 2010 - 08:46 PM

When the low coolant light came on, did you check the level in the radiator BEFORE you added anything to the reservoir? The low coolant sensor is in the radiator. Or, did you only check the reservoir, see that it was low, and add coolant without checking the radiator?

If you filled the reservoir to the top, and lost 8" of level in a short period, did you check for a puddle under the reservoir? It may be leaking. Low level there will not cause a low coolant light, until the reservoir is completely empty, and there is no coolant for the radiator to pull back in as it cools down.
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#6 User is offline   1993TransAm 

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Posted 30 January 2010 - 07:23 AM

I agree with Fred on this one. You shouldn't lose 8 inches of coolant in the overflow reservoir in a short period of time unless your actual sealed system is very low on coolant or you have a leak at the reservoir, which is a common problem with these vehicles because the battery sits on top of the reservoir. Battery acid can corrode the reservoir and cause a leak. The level sensor is in the radiator (as noted by several folks) about 2-3" below the filler neck, so for that sensor to close you have to be (1) quite low on coolant in the radiator and/or (2) the sensor has failed. I'd check the system for leaks first. Since your cooling system is sealed, you should have very little to no air in the radiator, even when it has cooled down completely.

This post has been edited by 1993TransAm: 30 January 2010 - 07:35 AM

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#7 User is offline   TransAm99 

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Posted 30 January 2010 - 05:18 PM

I added to the reservoir first, as the car was still hot. The fluid dropped from the top of the neck to the point where it flanged out into the larger reservoir over a period of 2 hrs. I drove home last night (130 mile drive) with no change in the level when I got home; the light was on the entire time and the engine temp was always around 205 on the gauge (210 being the middle).

There were no leak marks in my driveway this morning or in my apartment parking spot. When I cleaned the wheels and suspension today i took a look under the car and saw no leaks either so the system is still sealed.

I did notice a bunch of brown gunk mixed in with the green coolant when i checked the radiator. Could that have any effect on the sensor?

By the way, a new sensor is $58 at NAPA so any way to resolve this problem without getting a new sensor would be great!

This post has been edited by TransAm99: 30 January 2010 - 05:20 PM

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#8 User is offline   96TA 

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Posted 30 January 2010 - 05:26 PM

you can try taking it out and cleaning it real good but its not a gaurantee but its a chance. i did it to mine and it didnt work.
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#9 User is offline   TransAm99 

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Posted 30 January 2010 - 05:29 PM

View Post75TA, on 30 January 2010 - 05:26 PM, said:

you can try taking it out and cleaning it real good but its not a gaurantee but its a chance. i did it to mine and it didnt work.


Im guessing thats going to drain the radiator when I do that right?
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#10 User is offline   Injuneer 

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Posted 30 January 2010 - 08:20 PM

Are you saying you used "green" (conventional) coolant, and not the "orange" (extended life - Dex-Cool) coolant required for your engine? Hopefully, you didn't mix the two different coolants.
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Posted 30 January 2010 - 08:31 PM

View PostInjuneer, on 30 January 2010 - 08:20 PM, said:

Are you saying you used "green" (conventional) coolant, and not the "orange" (extended life - Dex-Cool) coolant required for your engine? Hopefully, you didn't mix the two different coolants.



I hope that didnt happen. My buddy did it to his camaro and it messed up the seal on the water pump.
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#12 User is offline   TransAm99 

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Posted 31 January 2010 - 07:38 AM

Well great. Now that I look at it there is Dex-cool (it is rust orange colored im guessing) in the radiator. There is barely any green in there at all yet because most of it is in the reservoir. Im getting the system flushed today asap.

This post has been edited by TransAm99: 31 January 2010 - 07:49 AM

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#13 User is offline   FBN Firebird Nation 

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Posted 01 February 2010 - 12:28 PM

Good call on getting it flushed.
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#14 User is offline   TransAm99 

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Posted 01 February 2010 - 09:38 PM

Got it flushed within 30 mins of making that post. They refilled it with Dex-cool and its been running great. When it was flushed I was able to see that all of the green came out of the reservoir and not the radiator so the two never mixed outside of the reservoir. What sucks is that cost $100 and I still have a broken sensor.
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Posted 20 November 2013 - 02:18 PM

Anyone have a WELLS #, Standard,(something I can cross reference at "Advanced" ? They no longer even show a listing for this sensor, that's where I bought it so it's under warrantee, but they can't look it up without a part # . Thanks
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Posted 20 November 2013 - 06:26 PM

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