Question about 1998 Jeep Grand Cherokee
I get an intermittent "Coolant Sensor Bad" message on the VIC...the coolant level sensor was changed out as was its connector...how do I make this annoying message stop? Interestingly, it happens less in cold weather... Checked out all other coolant sensors via the OBDII port and all was showing proper function...
The coolant sensor and the coolant level sensor are two different sensors. Your message center is showing (coolant sensor bad),not level sensor bad.
The level sensor only monitors the amount of coolant in the container
The coolant sensor senses the degrees of the coolant, which turns on the electric cooling fans. Change the coolant sensor, and the problem should go away.
Posted on Nov 16, 2009
Posted by on Nov 16, 2009 !!!!!!!! revived by piggy-backer.
the sensor is in the bottom of the side overfill tank, and is a fload switch (and hidden resistor),
The exact message " coolant bottle low/bad"
in your case it shows the BAD word, (matters)
this means the bottle switch is open
and not 3000 ohms, (normal) nor zero ohms as it must be.
the Cluster brain has 3 level logic.
0 ohms full.
open line BAD , means cut line. open on ground end cut.
or the wire to the Cluster at the pin on the cluster is cracked,(solder crack easy fix )
the cluster forces current down this wire.
if no current flows at all , the line is bad.(open)
dead open, why/where its open the cluster dont know
only that it is. (it actually measures volts there)
the acid test, is ground the cluster pin direct to ground, if BAD word fails to show, the cluster is ok.
if bad Shows, now, the cluster is bad.
Posted on Apr 25, 2016
I'm in the UK. I have a 1998 Grand Cherokee. For 2 years I have been getting a 'Coolant level sensor bad' message on the message centre. Two years ago I changed the coolant level sensor which made no difference...
... then I found out that it was a common Jeep fault - an untrue error message. Some things are easily ignored..
Posted on Apr 18, 2016
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Posted on Jan 02, 2017
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