Coolant level sensor bad - is this serious? - JeepForum.com
 
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post #1 of 11 Old 11-04-2004, 10:10 AM Thread Starter
Gracie
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Coolant level sensor bad - is this serious?

Hello -

My 96 Grand Cherokee Limited has started telling me that my coolant level sensor is bad. I have a leak somewhere in my cooling system and so every month or so I usually have to add antifreeze.

For some reason, I haven't had to add antifreeze for awhile. So I'm wondering - does "coolant level sensor bad" mean:

a) that the sensor in the reservoir just isn't going to let me know when I need to add more antifreeze and so I need to pay close attention to the antifreeze level or

b) does it mean that the sensor isn't going to let any more antifreeze into the system from the reservoir (which seems more serious)?

Thanks for all your help!!

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post #2 of 11 Old 11-04-2004, 12:58 PM
greasefingers
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I don’t have your type of system but I would assume that the message is displayed in a cryptic way. In other words “Coolant level sensor bad” probably means that the coolant level in the reservoir is low. Coolant is always allowed to flow back & forth between the reservoir and radiator when needed.

Cheers Steve

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88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #3 of 11 Old 11-04-2004, 01:53 PM Thread Starter
Gracie
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Quote:
Originally Posted by greasefingers
“Coolant level sensor bad” probably means that the coolant level in the reservoir is low. .
That was the first thing I thought of, too. But when I checked the reservoir it was completely full.

When my reservoir is low, the car says "Coolant level low". That's why when it says "coolant level sensorlbad" I knew that was something different.

Does that clarify it any?

Thanks!
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post #4 of 11 Old 11-04-2004, 02:04 PM
greasefingers
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I guess the computer knows the sensor is bad when it receives a signal that is out-of-range. Maybe someone with you’re your type of system can reply?

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #5 of 11 Old 11-04-2004, 07:31 PM
ZJGuido
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No it's not a serious issue. "Coolant Level Sensor Bad" simply means that the sensor that measures the amount of coolant in the resevoir is not functioning properly and needs to be replaced. It has no affect whatsoever on the operation of your cooling system. If you suspect that your cooling system is leaking coolant, then you'll have to keep an eye on level because the sensor is no longer measuring the actual level properly. If you want to replace the sensor, it's located right on top of the coolant resevoir and can be simply removed by pulling it out from the top.

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post #6 of 11 Old 11-05-2004, 07:29 PM Thread Starter
Gracie
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Hey Guido - thanks so much! That's my maiden name - maybe we're related!

Greasefingers - thanks for your help as well.

What did we ever do without the internet? Such a wealth of information from so many great people!

Thanks!!
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post #7 of 11 Old 11-07-2004, 08:27 AM
djvan
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Try a radiator cap for the leak, this is a cheap thing to check.

DougV>
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post #8 of 11 Old 11-17-2004, 09:02 PM
jotho
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Gracie - Did you find the problem? Maybe just cleaning the sensor will help...I'd imagine it can get pretty gummed up after 6 years.
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post #9 of 11 Old 11-18-2004, 01:48 PM
kentman
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Quote:
Originally Posted by djvan
Try a radiator cap for the leak, this is a cheap thing to check.

DougV>
How many miles of operation before a cap would typically go bad?

I have a very slow leak right up front, and I believe it to be the radiator, but I guess that it could be the cap. I will try that first, but I am not optimistic that it will solve my issue.

I have 172K. Thus, it could easily be the radiator itself.

Kent
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post #10 of 11 Old 11-18-2004, 02:17 PM
GPERSCREEPERS99
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My sensor just deteriated(SP) said the same thing. The plastic cracked and mine is like a float it took on coolant and it always said I was low I zip tied it up and now just check once a month. Not a serious problem. If it wasn't allowing antifreeze in you would be overheating. Not worth the money to fix. I forget how much it was but not worth it.

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post #11 of 11 Old 11-18-2004, 07:19 PM
dadjlh
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Not worth it? Part number is : S8108 O'Reilly auto parts, cost $12.38.

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