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Jeep Grand Cherokee Lim.: My 1998 Jeep Grand Cherokee Limited…

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My 1998 Jeep Grand Cherokee...
My 1998 Jeep Grand Cherokee Limited is showing a msg on the center screen that my coolant temp sensor is bad. I have replaced the sensor and continue to get the same msg. I have 5 volts at the sensor connector. Not sure of the resistance of the sensor. My fuel mileage seems to have dropped from 12 plus to 10 .4. Could this be a ECM problem?
Submitted: 2 years ago.Category: Jeep
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Answered in 10 minutes by:
6/30/2015
Jeep Mechanic: Dan, Technician replied 2 years ago
Dan
Dan, Technician
Category: Jeep
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Hello, my name is ***** ***** I'm here to help get your problem solved. What size engine do you have? Is your check engine light on?
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Customer reply replied 2 years ago
5.2lt, No
Jeep Mechanic: Dan, Technician replied 2 years ago
This warning your getting is for the coolant level sensor, not the coolant temperature sensor. If the coolant is at the proper level, test the resistance of the sensor. The normal resistance is 3000-3500 ohms when the level is at the proper level. The Pink/Black wire should have approximately 5 volts to 12 volts with the sensor unplugged. The Black wire should be chassis ground. Let me now how it goes or if you have more questions, thanks.
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Customer reply replied 2 years ago
I think my coolant reservoir is low. Will top off and let you know.
Jeep Mechanic: Dan, Technician replied 2 years ago
Sounds good, keep me updated. Thanks.
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Customer reply replied 2 years ago
Over flow res was quite low. Refilled. Will drive a few miles and advise if msg stays off. Willadvise.
Jeep Mechanic: Dan, Technician replied 2 years ago
Good to hear. Let me know if you run into more questions, thanks.
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Customer reply replied 2 years ago
Console still showing bad sensor. Will it cancel itself after awhile?
Customer reply replied 2 years ago
Is this sensor a dealer only item?
Jeep Mechanic: Dan, Technician replied 2 years ago
If it still shows bad sensor then you will want to replace the sensor. You should be able to get this from any of your local parts stores. Let me know how it goes or if you have more questions, thanks.
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Customer reply replied 2 years ago
Thank you!
Jeep Mechanic: Dan, Technician replied 2 years ago
No problem, keep me updated. Thanks again and have a great day!
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Customer reply replied 2 years ago
I replaced the level sensor. Still getting the same msg. Voltage at 5 going to the sensor. ????
Customer reply replied 2 years ago
Check engine came on and then went out and has not reappeared.
Jeep Mechanic: Dan, Technician replied 2 years ago
Let me know if it comes back on, thanks!
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