New Overflow tank for coolant - Need help about sensor
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Intermediate
Joined: Jun 2025
Posts: 41
Likes: 2
From: Papillion,Ne
New Overflow tank for coolant - Need help about sensor
So I did my research first and found that several people on the forum have had success with : Dorman 603-140 Front Engine Coolant Reservoir for Select Chevrolet Models
I'm getting the dread "low coolant" message on DIC. My Reservoir is pretty dingy. I cleaned it out as best as possible and I can hear something "rattling" in there so I think the float was stuck.
Seeing that the Reservoir price is not too bad, I'm think about buying a new one. However, when removing my old one, it looks like the sensor is not replaceable.
I tugged on it pretty good. Am I just being a wimp and need to tug harder ?
It doesn't look like the Doorman comes with a sensor. What am I missing?
Also... is there a low coolant sensor on the radiator too? One that looks like the ECT sensor?
Thanks
Todd
I'm getting the dread "low coolant" message on DIC. My Reservoir is pretty dingy. I cleaned it out as best as possible and I can hear something "rattling" in there so I think the float was stuck.
Seeing that the Reservoir price is not too bad, I'm think about buying a new one. However, when removing my old one, it looks like the sensor is not replaceable.
I tugged on it pretty good. Am I just being a wimp and need to tug harder ?
It doesn't look like the Doorman comes with a sensor. What am I missing?
Also... is there a low coolant sensor on the radiator too? One that looks like the ECT sensor?
Thanks
Todd
Tech Contributor
Joined: Jan 2007
Posts: 19,472
Likes: 1,171
From: Dyer, IN
So I did my research first and found that several people on the forum have had success with : Dorman 603-140 Front Engine Coolant Reservoir for Select Chevrolet Models
I'm getting the dread "low coolant" message on DIC. My Reservoir is pretty dingy. I cleaned it out as best as possible and I can hear something "rattling" in there so I think the float was stuck.
Seeing that the Reservoir price is not too bad, I'm think about buying a new one. However, when removing my old one, it looks like the sensor is not replaceable.
I tugged on it pretty good. Am I just being a wimp and need to tug harder ?
It doesn't look like the Doorman comes with a sensor. What am I missing?
Also... is there a low coolant sensor on the radiator too? One that looks like the ECT sensor?
Thanks
Todd
I'm getting the dread "low coolant" message on DIC. My Reservoir is pretty dingy. I cleaned it out as best as possible and I can hear something "rattling" in there so I think the float was stuck.
Seeing that the Reservoir price is not too bad, I'm think about buying a new one. However, when removing my old one, it looks like the sensor is not replaceable.
I tugged on it pretty good. Am I just being a wimp and need to tug harder ?
It doesn't look like the Doorman comes with a sensor. What am I missing?
Also... is there a low coolant sensor on the radiator too? One that looks like the ECT sensor?
Thanks
Todd
The coolant level indicator switch was only used from 97-99. I'm fairly certain no one reproduces the tank with the switch but NOS ones show up on ebay from time to time.
How do you know the level switch is bad? Have you checked for 12v on the yellow/blk wire contact and a good ground(load tested) on the black wire contact? You can also ground the yellow/blk wire contact and the low coolant message should go away if all is working correctly.
No, there is not a temp sensor or switch for the radiator.
Last edited by lucky131969; May 31, 2026 at 09:39 AM.
