Question about 2003 Jeep Wrangler

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Need to know how to replace a thermostat and coolant temperature sensor on a 2003 jeep wrangler.

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How to replaced a termosthat on 03 wrangler

Posted on Dec 10, 2009

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6ya6ya

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Posted on Jan 02, 2017

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I have a Kia Optima 2002. I needed to replace the coolant temp. sensor. Where on a diagram, of the motor, v6, will I locate the sensor?


Depending on what car/ model you have, there may be 2 sensors on the engine. I don't honestly know about your particular vehicle.

However, you needn't rely on a wiring diagram to find it as they are very easily located.
Below is an image of a coolant sensor temperature. Yours will look pretty much like the one in the photo.
25929734-llkdp3pjxd1sy1nazmdezhqo-2-0.jpg To find it, open the bonnet/hood of your car and look at the cooling system. Somewhere, in the area of the thermostat (there'll probably be a wide-bore water hose in the vicinity) you'll find it. It screws into the metal of the thermostat/cylinder head area, and connects via that black connector to a connector on the wiring harness. It should be quite easy to see.

The job of the coolant temperature sensor is to work in conjunction with other sensors, to control the fuel/air mixture combined with engine temperature.

Often, on vehicles such as the Jeep Grand Cherokee (which I have) an error message may appear on your display to say 'coolant temperature sensor bad'. In the case of the Jeep Grand Cherokee this is a known 'bug' - there's nothing actually wrong with the sensor. The Jeep runs fine ..it's a 'false error message'. An occasional bug.

Is your Kia running fine..? If it's not overheating and doesn't have starting/idling/running problems...
25929734-llkdp3pjxd1sy1nazmdezhqo-2-1.jpg

Oct 28, 2015 | Kia Cars & Trucks

1 Answer

2003 jeep wrangler temp guage keeps going up and down.the check gauge light goes off and on. appears to be overheating


It sounds like you need a new thermostat. Have a trusted mechanic replace your thermostat, shouldn't cost more than $20-30. The thermostat is located in your thermostat housing on the engine and is connected to the Upper Radiator Hose. Remove the 2 bolts and change the thermostat.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Oct 07, 2011 | 2003 Jeep Wrangler

1 Answer

Do you need to replace the thermostat housing if only the sensor is bad and telling the conputor to turn on the service engine light?


How do you know the sensor is bad? Have you checked the coolant temperature using an external temperature gauge?
Best bet is to replace both the thermostat/housing and the temperature sensor, they are not that expensive, and are located in the same area of the engine.

Aug 04, 2011 | 2003 Chevrolet TrailBlazer

2 Answers

Could you tell me where the coolant temperature sensor is located at on an inline 6, 4.0L 2003 Jeep Grand Cherokee Laredo?


zjlimited_1234.jpg

Fig. The coolant temperature sensor is installed in the thermostat housing (click image for zoom).
  1. Partially drain cooling system until coolant level is below cylinder head.
  2. Disconnect coolant temperature sensor wire connector.
  3. Remove sensor from thermostat housing.
Hope helps (remember to rate ths answer).

May 12, 2011 | 2003 Jeep Grand Cherokee

1 Answer

My 2003 kia spectra comes up with P116 and P128 error messages. What do I need


p0116 is-- engine coolant tempurature ckt/range performance----- p0 128 is--coolant temp below thermostat regulating temperature. to fix these 2 codes are similar, change coolant tempurature sensor and thermotat all should be ok. make sure coolant in radiater is full. hope this helps you.

A code P0128 may mean that one or more of the following has happened:

  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty coolant temperature (ECT) sensor
  • Faulty intake air temperature (IAT) sensor

Feb 07, 2011 | 2003 Kia Spectra

2 Answers

When replacing the thermostat on my 98 jeep wrangler (4.0 6 cyl.) does the thermostat go in first, then the gasket or the other way around?


Check out the diagram:

1423f4e.gif
The removal of the thermostat from its housing on the 4.0L engine

To install:
  1. Install the replacement thermostat so that the pellet, which is encircled by a coil spring, faces the engine. All thermostats are marked on the outer flange to indicate the proper installed position.
  2. Observe the recess groove in the engine cylinder head .
  3. Position thermostat into this groove with arrow and air bleed hole on outer flange pointing up.
  4. Install replacement gasket and thermostat housing

    CAUTION Tightening the thermostat housing unevenly or with the thermostat out of its recess may result in a cracked housing.

  5. Tighten the housing bolts to 15 ft. lbs. (20 Nm) torque.
  6. Install hoses to thermostat housing.
  7. Install electrical connector to coolant temperature sensor.
  8. Be sure that the radiator draincock is tightly closed. Fill the cooling system.
  9. Start and warm the engine. Check for leaks

WARNING Do not loosen radiator drain **** with system hot and pressurized. Serious burns from coolant can occur.



NOTE Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse. If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model and engine type.

Dec 06, 2009 | 1998 Jeep Wrangler

1 Answer

Proper operating temperature on 2004 Jeep Wrangler, Unlimited


The thermostat controls operating temperature. This occurs at a preset temperature (typically 195 degrees F. or so), which is usually stamped on the thermostat itself. The thermostat should be fully open about 20 degrees F. above the rated temperature. So your operating temperature is about right. If you have doubts, just replace the thermostat with a new one of the correct temp.

Sep 28, 2009 | 2007 Jeep Wrangler Unlimited Rubicon 2...

1 Answer

Service engine soon light on 2003 Saturn Vue


Here is the definition of the code in GM manual:
P0128 - Coolant Thermostat Below Thermostat Regulating Temperature, this indicates the engine is running cold, u need a thermostat

Feb 12, 2009 | 2003 Saturn VUE

1 Answer

1992 Jeep Wrangler heater not blowing hot air


How often has the coolant been changed? My only guess is that it hasn't and the hoses and the heater core are plugged up with goo and a flush is needed

Dec 05, 2008 | 1992 Jeep Wrangler

1 Answer

Hey


the temperature sensor is it connect its close to the thermostat check that out cheers pierre

Jun 29, 2008 | 1995 Jeep Wrangler

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