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Old 02-23-2021, 01:38 PM   #1
dj1111
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Default Low coolant light

It's been a while. My last visit here was 4.5 years ago. The old 2000 SL2 continues to be extremely dependable. I also searched the forum and did not find any solutions.

My low coolant light came on about a month ago. Checked the coolant and it was within the upper and lower limits on the tank. If it was warmer (above zero) I would have done some experimenting but instead just purchased a new tank. I did find some info on these tanks where the sensors do go bad and are not replaceable individually so you have to do the whole tank. Well it's in the 30's today so I replaced the tank and the light is still coming on. Guessing there is something wrong with the wiring.

Anyone have experience with this or any helpful advice? Thanks.
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When I was younger I drove a lifted 4x4 truck with over sized tires. Needed a ladder to get into it. Now in my 60's I drive an SL2 and need a ladder to get out.
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Old 02-23-2021, 02:47 PM   #2
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Default Re: Low coolant light

Quote:
Originally Posted by dj1111 View Post
My low coolant light came on about a month ago. Checked the coolant and it was within the upper and lower limits on the tank.
It's a pretty narrow band. See the pic at post 5 and my experience was in post 11 in this thread.

http://www.saturnfans.com/forums/sho...d.php?t=237165

TL;DR: It's not like other cars where you fill the tank up to about half way and call it good. That's actually the min cold line or below. Fill it all the way to the seam, where the max cold line is.

Also, welcome back, don't be a stranger
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Old 02-23-2021, 03:20 PM   #3
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Default Re: Low coolant light

Richpin guide on cleaning out the tank:
https://youtu.be/-5814yr2p_Y

It is possible your new tank may have been gunked up inside, assuming it was from the junkyard.
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Old 02-23-2021, 03:25 PM   #4
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Default Re: Low coolant light

Thanks for the reply alordofchaos.

I just tested the original tank (something I should have done first) and it is ok. Attached an ohm meter to the two electrical prongs then slowly filled the tank with water. Just when the level got near the lower coolant level it went to zero ohms. I then slowly drained it and when it got somewhere below the lower level line it went back to infinite ohms. So it looks like it's some other issue.
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When I was younger I drove a lifted 4x4 truck with over sized tires. Needed a ladder to get into it. Now in my 60's I drive an SL2 and need a ladder to get out.
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Old 09-13-2021, 02:28 PM   #5
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Default Re: Low coolant light

Well OMG I just fixed it. The original tank was fine so I shouldn't have bought a new one. I did another search online today and found the answer in the Saturn Vue part of this forum. The low coolant light is on the same fuse as the backup lights. Replaced the fuse and the coolant light is off now. But, now I don't have backup lights even with the new fuse in. So I'll have to look into that and search these forums. I did some driving and put it in reverse many times and it did not blow the fuse so hopefully it is not a short in any wiring. I assume the light switch is in the console somewhere in the shifter parts. It's a manual trans. Oh and I did a voltage check at the light sockets and no 12 volts, the bulbs looked good.
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When I was younger I drove a lifted 4x4 truck with over sized tires. Needed a ladder to get into it. Now in my 60's I drive an SL2 and need a ladder to get out.
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Old 09-13-2021, 04:28 PM   #6
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Default Re: Low coolant light

The switch is on the trans shift-tower/cover, approximately below the brake master cylinder.
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Old 09-13-2021, 04:38 PM   #7
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Default Re: Low coolant light

Thanks for the reply billr, yes I've done some research and located it on my Saturn. Easy to get at. I just drove it so it was too hot under the hood to work on it. And the mosquitos are really vicious in my area from so much rain so it's not pleasant out there even with it in the garage. Before I order a new one I'll do some testing so see if the switch is truly bad and short the connector prongs to see if the lights do come on.
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When I was younger I drove a lifted 4x4 truck with over sized tires. Needed a ladder to get into it. Now in my 60's I drive an SL2 and need a ladder to get out.
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Old 09-13-2021, 08:09 PM   #8
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Default Re: Low coolant light

Browse the thread below for more background info on that switch...

http://www.saturnfans.com/forums/sho...d.php?t=267822
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Old 09-14-2021, 12:10 PM   #9
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Default Re: Low coolant light

Thanks billr. When I pulled the plug off the switch I found the end of it wet with trans fluid. And inside the plug end of the switch it was also very wet with fluid. I assume the switch is leaking internally. I shorted out the prongs on the plug and the lights went on. I plugged the connector into the switch and pushed the ball plunger in and no lights. Safe to assume the switch is bad. I'll order one of the ACDelco Professional switches and hope for the best. Not going to try junk yards in my area seeing as they usually charge way too much for parts. And I will be getting a switch about as old and the one it's replacing.
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When I was younger I drove a lifted 4x4 truck with over sized tires. Needed a ladder to get into it. Now in my 60's I drive an SL2 and need a ladder to get out.
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Old 09-17-2021, 02:18 PM   #10
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Default Re: Low coolant light

Fixed. Well mostly. Further testing with the old switch proved it was completely dead. The new switch works fine but as has been mentioned before in these forums the lights don't always go on the first time you shift into reverse. It takes a little wiggling of the shifter to make them go on. For now that's fine, at least I know it will work. And my low coolant light is fixed as well. After all the car is 21 years old and if this is my only complaint I'm doing fine. Everything else on the car still works including the air conditioning. Has 164,000 miles on it. Owned it for 16+ years now. Never planning on getting rid of it.
...
When I was younger I drove a lifted 4x4 truck with over sized tires. Needed a ladder to get into it. Now in my 60's I drive an SL2 and need a ladder to get out.
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