Question about 1998 Jeep Grand Cherokee

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I am getting a bad coolant sensor reading on the information screen what could this be

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

Review the #8 wire in a ribbon connector, the factory that made the VICs use a wave soldering method, and the #8pin (which is the coolant sensor ground pin- IIRC it's pink- will havea cold solder joint. If you can see faults in this connections,it takes about 15 minutes to get the VIC out of the car, and if you cansolder, another 5 to fix the problem. I'd advise re-soldering all theconnections, while you're in there.

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

Good luck, and remember rated this help.

Posted on Oct 06, 2009

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I have a 2004 Ford F-150 5.4 triton and I was reading a bad code retaining to the coolant temp sensor so i replaced the cylinder head temp sensor as shown and now I'm reading a code for the cylinder head...


You have to clear the codes. Go to your Ford dealer (not all can do this). The cheaper solution is go to your local auto parts store and ask them to clear the codes. It's usually free. Sometimes some codes won't come off when you use the "remove the positive cable from your battery and touch it to the negative post for about 10 seconds". Careful hear, do it right as if you get a spark you are doing something wrong. As to the auto parts store they can or should give you all the codes including the new ones as I think you didn't disconnect the battery when you you changed the sensor.

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My 2003 Chrysler Sebring is overheating. A mechanic friend of mine is trying to teach me how to work on cars, and we redid the head gasket and ran into many issues, and this problem is our final barrier...


The ECM doesn't read the temps. it only takes the readings from the sensors and tries to adjust within given parameters. You has a coolant sensor on the car you have a temp sensor on the car. Check the wiring, make sure you didn't plug the wrong wire to the wrong sensor. Check to make sure everything is actually plugged in and getting power. It's definitely either bad wiring or a bad temp sensor.

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2007 Chevy Silverado 2500 HD. I was driving and my digital dashboard reported engine hot and AC turned off. My temperature gauge read cool. What do I need to replace?


This sounds like a bad coolant temp sensor that give computer false reading, check the coolant temp sensor connector and if it is good with no bad wires to connector then replace coolant temp sensor , when the computer gets a signal from temp sensor that engine is hot it turns fans on high speed to cool radiator and displays a/c turned off , if this truck does not have electric cooling fans then they wont run just explaining what happens depending on engine and cooling set up. replace coolant temp sensor and check connector.

Dec 25, 2012 | 2007 Chevrolet Silverado 2500HD

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I have a 1993 K1500 with the 5.7L and I need to know what a code 15 is


Code 15 = Engine Coolant Temp (ECT) sensor indicates low temperature, or ECT sensor circuit open.

If the ECT becomes disconnected or fails open, it will read full cold and send the information the computer. The computer then uses this bad information to enrichen the fuel mixture--even when the engine is hot. The result can be poor warm starting, poor gas mileage, black smoke from exhaust, and rich misfiring.

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3 Answers

Electronic display says coolant sensor bad. I replaced the sensor located in the recovery bottle, but it still reads bad?


Good Evening, I can certainly understand your problem, I fought with a 97 grand cherokee with the same problem, at the end of all the troubleshooting it ended up being the information display module. Certainly it is something to consider, especially changing the sensor a couple times to be sure. Hope this helps, If you have any more questions please feel free to ask.

Aug 29, 2010 | 1996 Jeep Grand Cherokee

2 Answers

My indicator stated that I had a "bad coolant sensor." The warning would come on then go off every other day. Well this afternoon, after driving around all day, my 1996 Jeep Grand Cherokee started to...


What repair did you make when the "bad coolant sensor" light came on? If you did nothing, I'm sure you know that not only does the sensor give you temperature info, it also tells the computer when the engine is warmed up so it can properly manage fuel delivery. That same information tells the computer when to turn any auxiliary electric fans on, or to modify the engine timing to cool down the engine.
At this point your only best option is to replace the sensor, the thermostat and re-fill with the proper mix of coolant. Check everything over for leaks and hope you have not sustained any major internal engine damage (head gaskets or cracked heads).
Good luck!!

Jun 06, 2010 | 1996 Jeep Grand Cherokee

3 Answers

Coolant Sensor Bad Message on the Vehicle Information Center intermittently displayed on my 1996 Grand Cherokee. Have changed the Float Switch 3 times and no joy.


Check the inside of the plug and make sure that the prongs are in good condition. They may be corroded. Napa sells a replacement pigtail for the plug.

Mar 29, 2010 | 1996 Jeep Grand Cherokee

1 Answer

Coolant senser bad were is it on the engine its not on the radiator


If you are getting a coolant sensor message on the VIC (screen above the shifter), then the sensor for that is located in the coolant overflow tank. Sometimes it is a problem with the sensor, other times it is bad soldering and/or a bad VIC.

The temp sensor is located in the thermostat housing (center/front of engine just above belt.

Dec 06, 2009 | 1996 Jeep Grand Cherokee

2 Answers

Coolant light stays on after coolant was added


you have a bad sensor in the reservior.

Oct 03, 2008 | 1999 Chevrolet Lumina

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