Question about 1997 Jeep Grand Cherokee

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'coolant sensor bad' message flahses on lcd panel.

The 'coolant sensor bad' message flashes on the lcd panel. Where do you check sensor connection, to see if loose or what?

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The coolant temperature sensor is most commonly located near the thermostat housing. It will have 2 wires connecting it. Don't confuse this sensor with the coolant temp sending unit that controls your gauge temp, which generally has 1 wire connecting to it. Removal and replacement of the coolant temp sensor is fairly simple and best of all, it's cheap. You'll pay maybe $15-$20 for it and I would HIGHLY recommend replacing it! It is arguably the most important sensor on your vehicle, as it tells the computer how rich/lean to run the engine based on its temperature. As it ages, the thermistor inside the sensor can tend to run out of calibration and may cause the computer to think the engine is much warmer or cooler than it really is. This can lead to hard starting, rough operation, overly rich/lean fuel mixture, etc.

I hope this helps! Please let me know if I can be of further assistance in this matter. :)

Posted on Nov 14, 2009

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LOL it's not the coolant temp sensor it's the coolant over flow sensor ! you can replace it but 99% of the time the VIC (lcd panel) has a bad solder joint pull it out take it apart resolder where the wiring conector plugs in & it it fixes them

Posted on Nov 15, 2009

  • joe10222 Nov 25, 2010

    coolent sensor NOTTT !!! the same as the coolant overflow sensor, dummy



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My coolant sensor is bad on 1998 Jeep Grand Cher Laredo TSI V8 5.2 4X4 is flashing in control panel.

Trace the upper radiator hose toward the Grand Cherokee's engine until you reach the metal component connecting the hose to the engine -- this is the thermostat housing. Find the coolant temperature sensor -- the electrical component on the thermostat housing. Press the locking button on the coolant temperature sensor wiring harness and pull the wiring harness from the sensor, then remove sensor it screws out. when putting in new sensor coat the threads with teflon pipe thread tape so there is no leaks.

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Hello: You didn't post what year/model car. If its 1996 or newer the coolant level sensor is located in the overflow tank. Sometimes you can tap on the tank near the sensor and it will work. Make sure the sensor is connected, not easy to get access to it. To replace the sensor you will have to replace the tank.

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1996 grand cherokee lerado - stalls in the middle of driving...'bad coolant sensor' message also comes on... are they connected problems of two different issues??

Coolant Sensor send bad signal to the ECU and the engine is work with abnormal parameters. Unplug the coolant sensor and clean the pin harness, sometimes this work, If not fix the problem, you need replace this sensor. For other details about Cooling System check your Service Manual ZJ-Secc-7-Cooling-System

Hope helps (remember rated this) Good luck.

May 26, 2010 | 1996 Jeep Grand Cherokee

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Message said coolant sensor bad

might have to replace the coolant temperature sensor near the upper radiator and in the reservoir, if you do dont forget to disconnect the battery, it will reset the computer, if it still shows the error it might be a bad connection on the vic. If it doesnt bother you leave it alone, it wont hurt anything, just monitor your coolant level the old fashioned way.

Dec 19, 2009 | 1996 Jeep Grand Cherokee

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I get an intermittent "Coolant Sensor Bad" The FSM is clear, Bad mean the line to the coolant bottle switch is open.

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.

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93 grand cherokee 5.2 V8, red square flashing on VIC display

Your VIC doesn't provide you with codes per se, it supplies other information and what you describe here is what should be written on your VIC, "Coolant Sensor Bad." The actual Coolant Sensor runs to your PCM or computer and your check engine light will come on if it runs at or above 5 volts or below 0.1 volts. If the red square on the vehicle layout is illuminated under the hood area, it means that your Coolant Recovery jug is either low on anti-freeze or the sensor next to the yellow filler cap is faulty...meaning you're low on Coolant and the VIC says that the "Coolant Sensors Bad" yet it's the amount of fluid in the plastic bottle next to the passenger side firewall, right in front of your PCM or computer. If you're low on anti-freeze, keep an eye on it, or have the coolant system pressure tested...including the 18 pound cap on the radiator itself. Also check the two wires hooked to the Coolant LEVEL Sensor in the jug with an Ohmmeter and it should be an open circuit if the level is fine, or hardly any Resistance if the level is low, causing that circuit to complete it's ground circuit and thus signaling the VIC through your BCM to turn on. (Body Control Module). The Haynes Manual you will need is # 50025 which encompasses all Jeep Grand Cherokee's from 1993 thru 2004.


Nov 05, 2009 | 1996 Jeep Grand Cherokee

1 Answer

Collant sensor bad

This problem is frecuently in this models, check the levels, check and clean the plug connections and Reset your ECU.

Also, can reviewthe #8 wire in a ribbon connector, the factory that made the VIC's use awave soldering method, and the #8 pin (which is the coolant sensorground pin -IIRC it's pink- will have a cold solder joint.

If you cansee faults in this connections, it takes about 15 minutes to get the VICout of the car, and if you cansolder, another 5 to fix the problem. I'dadvise re-soldering all the connections, while you're in there.

If the problem stay there, just change your coolant sensor.

Good luck, and remember rated this help.

Oct 08, 2009 | 1997 Jeep Grand Cherokee

1 Answer

Need locations of all the themperature sensors on my 1996 Jeep Grand Cherokee Limited Edition 5.2 Liter, the dash says the Colant Sensor Is Bad, thought about punishing it :-), been doing this for about 3...

The Coolant Sensor is inside coolant bottle; in this models is common ths message failed; clean the plug and reset your ECU alarms, if the message come on again, replace your coolant sensor. And, really, one message about a bad sensor/signal is one bad work engine.

Good luck.

Sep 06, 2009 | 1996 Jeep Grand Cherokee

2 Answers

Coolant sensor no good

Check the plug conector from the coolant sensor at the ECU, maybe cleaning with dielectric solvent you will can have a solution.

Review this doc Secc-7-Cooling-System / Page 7-23 ...

Good luck

Sep 03, 2008 | 1996 Jeep Grand Cherokee

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