Low Coolant Light
Thread Starter
Launching!
Joined: Apr 2008
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Low Coolant Light From what I hear, these lights go off due to sensor issues. I've flushed and filled my cooling system several times in the past few years, and the light has been on ever since. My question is, does anyone know of a way to get the light to come off? (without unplugging it from the dash). Is there a replaceable sensor?
I have heard its optical but you can just clean it and it will be fine. Seems to be common... every 93-97 F-Body LT I have been in so far has had it on. Mine goes off and on I plan on cleaning it shortly but I have an IM to take off and redo the gaskets on as well as finishing my steering column... drive shaft swap... front rotors and brakes.... drivers side SFC.... god the list never ends.
man mine is doing the same thing.
it did it last year around this same time. I added some coolant, actually a little over the mark.
but I just checked it again recently since the light came back on and it hasn't gone down a drop...
I figure it has to be the sensor.
it did it last year around this same time. I added some coolant, actually a little over the mark.
but I just checked it again recently since the light came back on and it hasn't gone down a drop...
I figure it has to be the sensor.
TECH Enthusiast
Joined: Sep 2006
Posts: 708
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From: FLORIDA
yep, just unplug it. Just make sure you check the coolant often to make sure that it's always full. You could also take out the sensor and try to clean it, sometimes that works.
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Launching!
Joined: Apr 2008
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No, it's running great now. I replace the opti, and WP this weekend, and it's running leak free. My WP had a bad water inlet that was leaking.
The low coolant light has been coming on almost since I bought the car! It just seems to be on almost constantly now. It's just an annoyance more than anything else.
The low coolant light has been coming on almost since I bought the car! It just seems to be on almost constantly now. It's just an annoyance more than anything else.
TECH Regular
Joined: Aug 2007
Posts: 418
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From: Cypress, TX
No, it's running great now. I replace the opti, and WP this weekend, and it's running leak free. My WP had a bad water inlet that was leaking.
The low coolant light has been coming on almost since I bought the car! It just seems to be on almost constantly now. It's just an annoyance more than anything else.
The low coolant light has been coming on almost since I bought the car! It just seems to be on almost constantly now. It's just an annoyance more than anything else.
early warning device. Take it out, clean it, put it back in, fill up the radiator,
and see if it works. If the light still comes on, go get a new sensor and put it
in - having that sensor might save your engine one day.
TECH Regular
Joined: Aug 2007
Posts: 418
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From: Cypress, TX
easier (I replaced mine about 2-3 weeks ago), remove the battery.
http://shbox.com/1/low_coolant.jpg
On The Tree
Joined: Dec 2001
Posts: 197
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By the time you've boiled out enough coolant to trigger the sensor, you're already WAY too hot and have NO pressure in the system.
There is almost NO chance you'd trigger that low coolant light before the gauge would spike (which happens when you lose pressure and start to boil coolant from no flow).
Clean it if you want, but I wouldn't bet the farm on it actually saving anything.
There is almost NO chance you'd trigger that low coolant light before the gauge would spike (which happens when you lose pressure and start to boil coolant from no flow).
Clean it if you want, but I wouldn't bet the farm on it actually saving anything.
TECH Regular
Joined: Aug 2007
Posts: 418
Likes: 0
From: Cypress, TX
By the time you've boiled out enough coolant to trigger the sensor, you're already WAY too hot and have NO pressure in the system.
There is almost NO chance you'd trigger that low coolant light before the gauge would spike (which happens when you lose pressure and start to boil coolant from no flow).
Clean it if you want, but I wouldn't bet the farm on it actually saving anything.
There is almost NO chance you'd trigger that low coolant light before the gauge would spike (which happens when you lose pressure and start to boil coolant from no flow).
Clean it if you want, but I wouldn't bet the farm on it actually saving anything.
low-coolant sensor one evening. The next day, on the way to work, the
'low coolant" light came on - I'm, like, WTH? Temp was fine. Turns out
stupid me forgot to add coolant in after replacing the sensor.
I have found that if the cooling system has a lot of sediment or someone has mixed regular green antifreeze with Dexcool causing it to "gel", then you will usually get a "sludge" like substance collecting around the tip of the sensor. It almost looks and feels like rubber cement. To eliminate this problem on some of my cars, it took flushing the coolant system a couple of times and removing and cleaning the sensor. I wouldn't recommed unpluging the sensor, unless you are really good at checking your temp gauge while you drive! Also, make sure you have the system bled completely. If you open the radiator cap and coolant is not at the top of the neck, it is not completely bled.
Launching!
Joined: Oct 2005
Posts: 202
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man mine is doing the same thing.
it did it last year around this same time. I added some coolant, actually a little over the mark.
but I just checked it again recently since the light came back on and it hasn't gone down a drop...
I figure it has to be the sensor.
it did it last year around this same time. I added some coolant, actually a little over the mark.
but I just checked it again recently since the light came back on and it hasn't gone down a drop...
I figure it has to be the sensor.
