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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

coolant light!!!

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Old Jul 2, 2008 | 01:13 PM
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Default coolant light!!!
i have a 94 z28, my coolant light keeps flashing every now and then, yet im not over heating and im full of coolant, im a little confused, any soulutions??
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Old Jul 2, 2008 | 01:34 PM
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well might be your sensors on your rad I'm not 100% sure but I had like 2 of them go that are on the radiator. I think there are 3 alone on it.
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Old Jul 2, 2008 | 01:34 PM
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That sensor goes bad. It will be on the passenger side of the radiator. Unplug it and run it for a while and see if that makes your issue go away. If so, then replace it or just leave it unplugged and monitor your temp gauge instead of having the computer flash a light at you...
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Old Jul 2, 2008 | 01:37 PM
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That light just seems to randomly come on, even with a new sensor. Hell if I knew unplugging it would keep the light off, I wouldn't have bothered replacing the original sensor.
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Old Jul 2, 2008 | 01:43 PM
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My coolant light was on all the time til I changed the sensor. If it comes on every now and then hmm... sounds like your coolant level is actually low. You better check the level again. Or replace the coolant sensor for fairly cheap.

http://shbox.com/1/low_coolant.jpg
It's a 5-10 minute operation.
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Old Jul 2, 2008 | 01:48 PM
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My coolant light was on all the time, checked the coolant and It was good. That son of a bitch was spreadin lies so I just unplugged it.
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Old Jul 2, 2008 | 01:49 PM
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Originally Posted by 95ZLT1
My coolant light was on all the time, checked the coolant and It was good. That son of a bitch was spreadin lies so I just unplugged it.
lol, yea mines out also
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Old Jul 2, 2008 | 02:45 PM
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I have heard that sensor is not the most accurate sensor on these motors and has pissed more than a few people off, I have been lucky that I have not had that problem. I would just unplug it and keep an eye on the level of coolant the old way, and rember to check the overflow when it is hot and the radiator when it is cold. Also rember to keep an eye on the coolant gauge. Good luck
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Old Jul 2, 2008 | 02:56 PM
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thnx. i will check it out, i think its just going out because it went like 2 months w out comming on, and it started flashing.
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Old Jul 2, 2008 | 03:11 PM
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Originally Posted by 94 F-body
I have heard that sensor is not the most accurate sensor on these motors and has pissed more than a few people off, I have been lucky that I have not had that problem. I would just unplug it and keep an eye on the level of coolant the old way, and rember to check the overflow when it is hot and the radiator when it is cold. Also rember to keep an eye on the coolant gauge. Good luck
It's not that is not accurate, it just fails over time as it gets clogged with crap and a poor design. I had the same issue and left mine unplugged for a while until I decided I wanted the sensor back. Bought a new one installed it in less than 10mins and works like a charm now. Wish I had taken a picture of my old one as it was so clogged and corroded, I wasn't suprised it finally failed.
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Old Jul 2, 2008 | 03:21 PM
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where exactly is it located??
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Old Jul 2, 2008 | 03:23 PM
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Originally Posted by fossilboy223
where exactly is it located??
On the back of the radiator (pass side) just behind the fill cap about a 1/3 of the way down. Kinda hard to get to and easier to work on if you remove the rad support.
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Old Jul 2, 2008 | 03:35 PM
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can it be done from the top or would it be easier from under neath
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Old Jul 2, 2008 | 05:25 PM
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My light has been on for about 5 years... lol

Coolant level is OK, but I just can't bring myself to spend $75 on a coolant level sensor.
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Old Jul 2, 2008 | 07:55 PM
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Unplugging it = Free...Cant beat free.
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Old Jul 2, 2008 | 08:47 PM
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Originally Posted by fossilboy223
can it be done from the top or would it be easier from under neath

I had to do both, but the hardest part this that PIA clip. BTW - you can get one from rockauto.com for $40, not to bad.
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Old Jul 6, 2008 | 04:15 AM
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Originally Posted by fossilboy223
can it be done from the top or would it be easier from under neath
the top. takes 10 seconds
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