2004 Jeep Cherokee Heating Ploblem

Tiny
EDGARDOSILVA
  • MEMBER
  • 2004 JEEP CHEROKEE
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 96,782 MILES
I have a GC special edition the over heat when I drive on the freeway after about 20 minutes running at 65mph the temperature needle stars move up and down from the normal to almost red zone and some times to the red zone the cause me pull over. I'm already change the fan cooling because was bad the low rad operation change the tst and the antifreezee and clean up well the radiator but still the problem.
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Monday, March 22nd, 2010 AT 7:55 PM

7 Replies

Tiny
RASMATAZ
  • MEMBER
Hi Edgardosilva, Welcome to 2carpros and TY for the donation.

Lets replace the thermostat for a start if it continues checked the radiator coolant level if okay also check if its clogged and water pump moving coolant thruout the engine and radiator. If there's no actual boiling over could be the coolant temperature sensor is out of calibration. Let me know what's happening
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Wednesday, March 24th, 2010 AT 4:33 PM
Tiny
EDGARDOSILVA
  • MEMBER
Thanks for you reply. Rasmataz

I checked all those things seem to me working properly no leaks new thermostat new water pump almost new radiator so I change the temperature sensor from the dealership but still the problem. How calibrate the coolant temperature sensor?
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Sunday, March 28th, 2010 AT 7:47 AM
Tiny
RASMATAZ
  • MEMBER
Use an ohmmeter to read the coolant temperature sensor. The normal resistance on an engine with 50 to 80 degrees F = 2,200 to 2,700 ohms. As the sensor temperature DECREASES, the resistance value will INCREASE.
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Sunday, March 28th, 2010 AT 8:01 AM
Tiny
EDGARDOSILVA
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I used an ohmmeter and gave me almost 8000hms when is cool. Stars warming up (temperature incleases) the resistances stars to decreases and when gets normal temperature (195 F) the reading is about 600 F. What that meas?
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Wednesday, March 31st, 2010 AT 3:03 PM
Tiny
RASMATAZ
  • MEMBER
For engine coolant temperature sensor testing, first disconnect the sensor wire and attach the red lead of the DVOM (Digital Volt-Ohm Meter) to the sensor terminal. Now attach the black lead of the DVOM to the ground. Set the meter to the 20K scale and observe and record the reading. Run your engine for two minutes and observe and record the reading again. The minimum difference must be more than 200 ohms.
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Wednesday, March 31st, 2010 AT 4:10 PM
Tiny
EDGARDOSILVA
  • MEMBER
The first reading was 199 Ohms after the 2 minutes running was 205 Ohms
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Wednesday, March 31st, 2010 AT 5:30 PM
Tiny
RASMATAZ
  • MEMBER
Test the coolant temperature sensor again and compare to typical values below if its out of specs replace it.


http://www.2carpros.com/forum/automotive_pictures/12900_cts_39.jpg

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Thursday, April 1st, 2010 AT 5:54 PM

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