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| Re: [GMCnet] The stock radiator low coolent level warning system light doesn't come on. [message #321968 is a reply to message #321965] |
Sat, 12 August 2017 13:12   |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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It works by passing a slight current through the coolant via the probe on the passenger side. Disconnecting the wire to the probe should cause the level alarm to light. Grounding the wire should cause the light to go out. It works much the same as the level sensors for the water tanks.
If it doesn't light and extinguish as it should, Check wires for continuity and clean connections. Make sure the circuit card is supplied 12V when the key is on, is grounded,, is connected to the light bulb, and is connected to the sense wire. If it still doesn't work, and the bulb tests good, suspect the circuit card. If I have a schematic for it, I can make it work.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] The stock radiator low coolent level warning system light doesn't come on. [message #322051 is a reply to message #321965] |
Mon, 14 August 2017 05:18 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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Is it coolant level or coolant percentege on the GMC? ON a couple of contemprary GM vehicles I owned, it was apparantly percentege and didnt work if the percentage of antifreeze was lower than some point. I was running straight water with pump lube- on constantly. Someone told me about it and later when running 50-50 mix it worked fine.
THe sensor Im refering to was on the radiator. Not on the coolant overflow.
76 Glenbrook
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| Re: [GMCnet] The stock radiator low coolent level warning system light doesn't come on. [message #322059 is a reply to message #321965] |
Mon, 14 August 2017 08:17 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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The OEM sensor is located in the passenger side radiator tank about a fourth of the way down. It consists of a simple wire probe glued into a hollow fitting using what looked like some sort of epoxy. GM refers to it as a coolant LEVEL indicator. If you wanted to play around with it, you could submerge the probe in different concentrations of coolant and distilled water, and measure the resistance of each. From this you could derive a percentage display if you wanted. I'd really rather know the water's low while traveling. I suspect any corrosion would throw off a percentage measuring system, since the corrosion products will ionize and change the conductivity of the coolant.
The above being said, it ain't a replacement for getting your finger wet each morning before you take off, and checking for drips under the coach,.
-johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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