Coolant sensor

Tiny
EBROWNELL
  • MEMBER
  • 1998 JEEP CHEROKEE
  • V8
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
Hi, I have taken my Jeep to the dealer with no luck. The " Coolant Sensor Bad" flashes up on the screen. The dealer said they replaced it however, it still flashes "coolant sensor bad".
Could you help me out?
Thanks, Erika
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Friday, April 25th, 2008 AT 8:13 PM

17 Replies

Tiny
RASMATAZ
  • MEMBER
If they replaced the coolant temperature sensor and it continues to comeback get the wiring and computer checked out-

Heres a guide on testing wiring

https://www.2carpros.com/articles/how-to-check-wiring

Attached below is the wiring for the coolant sensor so you can test it
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Friday, April 25th, 2008 AT 8:17 PM
Tiny
EBROWNELL
  • MEMBER
Thanks
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Friday, April 25th, 2008 AT 8:22 PM
Tiny
BRYANFURSE
  • MEMBER
  • 1997 JEEP CHEROKEE
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 164,564 MILES
I have a 1997 jeep grand cherokee laredo. And my message said coolant sensor bad. I replaced and still says bad. I have cleaned the connection and still no change. What should I do
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
RACEFAN966
  • EXPERT
So is it the coolant temp sensor or the coolant level sensor? Either way you need to reset the message center. So what you do is press the select button till you get to the message then once there you press and hold the set button for 2 sec. Or so thats it. If the message comes back then let me know and I will look to see what is happening but I need to know which sensor you replaced so we don't go back to the same one. I would also check you local parts stores and see if one does a free scan and if so then scan it and see what codes come up get those codes and then have them clear the codes and let me know what codes where there.
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
WILDHONEY1
  • MEMBER
I am having the same problem with my 97 grand cherokee, we have had a mechanic change the coolant sensor twice now and it is fine for a short time then the message board starts up again and it shows a diagram of the car and a red square flashes where the hood is in the picture and beeps and keeps saying coolant sensor bad, I tried to do the thing you were talking about with the set button when the warning board does it's little thing but it keeps taking me to the clock set and I can't get it to do anything else, please help!
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
GINLB611
  • MEMBER
  • 1997 JEEP CHEROKEE
  • V8
  • 4WD
  • AUTOMATIC
  • 14,400 MILES
How do you change the coolant sensor? The part is only $12.00 and I don't want to take to my mechanic. Thanks.
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
1997 Jeep Cherokee all I got is for 4/6cylinders you sure its V8
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
AIRSOFTSOLDRECN9
  • MEMBER
Are you driving Grand Cherokee? CTS sensor should be on or near the thermostat housing. The guage sensor is typically on the back of the block, or on the intake manifold.
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
SGIGGLES311
  • MEMBER
  • 1996 JEEP CHEROKEE
  • V8
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
I bought this vehicle about 2 months ago and paid $4000 for it. Now the vehicles computer says coolant sensor bad. The mechanic I bought it from said that it was a minor problem and that he had ordered the sensor from jeep. On friday when I went in to have the rear bulb changed the car didn't start when I went to pick it up, so they said it was the starter and changed the terminal on the battery and a brand new starter, it started but only after about the second try of not cranking over. Is this the coolant sensor or is there another problem of why its not starting?
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
Do you have a check engine light. Also the battery was disconnected might need computer relearning.

If the starter is cranking the engine over the starter is doing its job-what's preventing it from starting is a different issue. Could be spark or fuel problem. The coolant temperature sensor can be a problem here-The computer doesn't know how cold or hot the engine therefore its confused whether to give fuel or not-
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
JULIUS27
  • MEMBER
  • 1996 JEEP CHEROKEEJEEP CHEROKEE
I Have A 1997 Jeep Grand Cherokee v8 5.2l engine. My question is I replaced the temp switch on the engine block. I still get coolant sensor bad coming up on my information display. My engine heats up to about half way mark on my gauge and stays there. I was told that there is another temperature switch on or by the radiator. Can you tell me exactly where it is.
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
The CTS is on the intake manifold near thermostat housing.

The engine coolant level sensor on the right rear corner of the engine.

I don't see any other temperature switch close by or on the radiator for a 2.5L
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
JIMKULESA
  • MEMBER
  • 1990 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
I recently swapped my 1990 engine with a 1993 engine and had to move the location of the coolant temp sensor and I am wondering if it would read hotter in the new location I am having trouble with it overheating and it has a new thermostat in it
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
It shouldn't change anything unless you used the sending unit that was in the new engine. If you did, it could be sending more power to the gauge and causing it to appear to be overheating. What you need to do is rent or borrow a thermometer designed to read over 250 degrees. When the engine is cool, open the radiator and place the thermometer in the top of the rad and let it heat up. THe temp shouldn't get much above 200 degrees. IF the gauge says it's overheating and the thermometer says 200, you know there is a problem with the sending unit.

Let me know how it works out for you.

Joe
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
CHASEDE
  • MEMBER
Coolent overheating but not leaking from car. Car will only run for a little while before coolent starts bubbleing. Have changed thermostst still have same problem. 1990 jeep cherokee
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
JEEPJOE
  • MEMBER
  • 1993 JEEP CHEROKEE
I have a 1993 Jeep Cherokee 4.0 litre 2WD. Sorry about the long post, but I wanted to be detailed in the problem and what I have already done. I am having the following trouble:

Engine starts fine. It runs fine for a while. While driving on the highway at about 65 mph for around 10 minutes, the jeep will sometimes buck. It doesn't feel like its losing any power, but it may be. It will only do a little buck for about a second, then it will seem fine. It will buck again a few times during the next 10 minutes or so.

When I decelerate to get off the highway it loses power. If I press the gas, sometimes it will buck and go, sometimes it will stall. Today it did it again, but did not stall right away. I stopped to pay the toll and when I took my foot off the brake to go forward, it stalled.

When I try to start it, it turns over, but won't start. I checked the fuel rail and pressed the valve, and gas spurted out, so I feel there is fuel being delivered.

After about 5-10 minutes I can start the jeep and it will run fine for the remainder of the trip to work (about 5-10 minutes at 45mph city driving). At no time does the temp gauge show the jeep is overheating. It moves from 100 to 200 during the drive, so I feel the guage is working.

The check engine light has come one and gave a code reading of 12, 22 and 55. 12 I believe is the battery had been changed less then 50 starts ago. 22 I believe is the temperature sensor (which I replaced after getting the code, but I cannot seem to reset the check engine light). 55, which I was told is the test completed.

So now I need help from anyone who might have any ideas what is causing this. I really appreciate your assistance.

Thanks,
Joe
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)
Tiny
TURBINEMAN33
  • MEMBER
Joe I had a simular problem with my 1993 jeep an it was the ignition coil cost about 30 dollars to change it yourself. If that does not work it may be the crankshaft poisition sensor cost about 60 dollars. Hope this helps
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Tuesday, December 4th, 2018 AT 6:00 PM (Merged)

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