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Old 02-13-2019, 02:38 PM   #1 (permalink)
ronnyrtaylor
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Low coolant light goes on and off and on and off

Howdy! My 1984 Suburban 6.2 (used to be military vehicle)...low coolant light goes on and off and on and off with cold engine and even warm engine running. Radiator is full with 50/50 antifreeze. It does not have reservoir tank. I just bought it a few months ago. Own many trucks and suburban for 40 years but this one is my FIRST diesel. So what should I go and see if I can have it fixed? Thank you for your help.

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Old 02-13-2019, 05:54 PM   #2 (permalink)
Bigboytoys
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Unplug it and see it still does it, after that I would go over all grounds, cab chassis, rad crafle/fender, dash... on the other side it could a failed sensor which is easy and cheap to replace.



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Old 02-14-2019, 12:23 PM   #3 (permalink)
jnlperformance
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I'd install the overflow tank.

I would also bet it's a frayed wire in the circuit that's grounding out.. does it do it a lot when it gets bumpy?
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I'll get back to this later...
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Old 02-17-2019, 06:21 PM   #4 (permalink)
ronnyrtaylor
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Hi again...where can I find the low coolant sensor? Is it on radiator or overflow tank?
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Old 02-17-2019, 06:49 PM   #5 (permalink)
legendman
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Originally Posted by ronnyrtaylor View Post
Hi again...where can I find the low coolant sensor? Is it on radiator or overflow tank?

On the radiator, passenger side, it's a single wire.


Good video of it here...
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Old 02-27-2019, 08:28 PM   #6 (permalink)
mbost
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Mine used to do that. The wire connector gets to be loose or corroded. If corroded, clean it and all should be well. If loose, I can't help ya. I just leave mine unplugged. Good luck.
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