Question about 1996 Jeep Grand Cherokee

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How can i properly change my coolant temperature sensor that has gone bad?

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Make one clockwise wrap of teflon tape around the threads of the new sender. remove the wire on the old unit and remove it from the engine. working quickly place the new one into the hole and finger tighten. complete tightening with the wrench you used to remove it. Replace wire, start engine and let it warm up. shut it off and top off the recovery bottle. If you do this right, you should not loose more than two cups of coolant.

Posted on Sep 28, 2009

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Posted on Jan 02, 2017

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I have 2008 PT Cruiser; getting P0128 code; I've changed thermostat & temperature sensor; I have to fill the anti-freeze container every 2 weeks; temperature hand will not always be at half way point. ...


This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.
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
Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat
you have all ready replaced the thermostat with the proper temperature opening thermostat(hopefully) and coolant sensor, you say you have to refill the coolant every 2 weeks this indicates that you either have a coolant leak that needs to be checked out and repaired or you are burning coolant which indicates a possible head gasket problem which will have to be checked. a low coolant level will set this code as there is not enough coolant in the engine to get the engine to operating temperature and stay there. these last suggestions is where I would start to look.

Sep 24, 2014 | 2008 Chrysler Pt Cruiser

1 Answer

Why would my 2001 voyager be over heating changed fans and fans wont kick on


Hi Tina-
In general, assuming you have the proper levels of coolant in the system, the next item to check is the thermostat. It is held in a metal housing bolted to the top of the engine block at the end of the upper radiator hose. This controls the temperature of the coolant in your cooling system. Not operating correctly, it would not allow the hot water in your engine to properly flow to the radiator to be cooled and cause overheating.
If your fan is not coming on at all, it may be that the temperature sensor they are connected to is faulty. The sensor turns on the fans once the coolant reaches a certain temperature. If the sensor is bad, the fans will not turn on regardless of the coolant temperature.
Lastly, if the water pump itself is bad (not circulating the coolant), this will cause overheating. Usually, a bad water pump will begin to show itself as a puddle underneath your car-since bad seals or bearing will cause it to fail this way-but I have also seen where poor maintenance of the coolant itself (not being flushed and changed at required intervals) have allowed deposits in the system to wear the blades inside the pump and reduced its effectiveness.
Hope this helps!

Apr 01, 2014 | 2001 Chrysler Voyager

1 Answer

2003 galant 4cyclinder running hot, changed thermostat and waterpump and is still running hot


Make sure your radiator is working and you have proper coolant and no leaks. Make sure your fans are kicking on. You might have a bad coolant temperature sensor.

Feb 13, 2011 | 2003 Mitsubishi Galant

2 Answers

P0128 coolant temp below thermostat/regulating temp


P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

Symptoms: You will likely not notice any drivability problems other than the MIL illumination.

Causes: 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

Possible Solutions: Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
* Verify coolant strength & level
* Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
* Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
* Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
* If the above items check out good, replace the thermostat
* If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code

Hope helps (remember to rate and comment this).

Sep 27, 2010 | 2006 Dodge Caravan

1 Answer

Vw jetta 2002 code p1296/po118


Both of these codes indicate trouble with the signal from the coolant temperature sensor.

So either the sensor is bad. The thermostat is not working properly and the coolant temperature is truly way out. The wiring to the sensor is short or open. The computer is bad and it is manifesting itself through this fault.

Does the car warm up properly? If it runs hot, or takes forever to warm up, this indicates a problem with the thermostat.

If the car runs at the proper temperature the next thing to look at is the coolant temp sensor and wiring. Some resistance values for VWs are here:
http://forums.vwvortex.com/zerothread?id=4267675

You might also be interested in this recall if your car is below 100k miles:
http://forums.vwvortex.com/zerothread?id=3694323

Jan 19, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

Changed radiator fan relay but fan still doesn't work (Fan motor ok)


What year is the vehicle? Your coolant temperature sensor may be bad which indicates the system when to turn the electric fan on and off with engine temperature and also a a/c clutch switch that turns the fan on with a/c usage. If the temperature sensor is not operating properly your fan will not come on. Depending on the year, you may have TWO sensors; one is for gauge operation and the other for the PCM and the fan, also known as the ECT (engine coolant temp). It should be a fairly cheap part.

Good luck!

Aug 30, 2009 | Pontiac Firebird Cars & Trucks

1 Answer

Temperature hand stays on high after changing thermostat.


the engine coolant temperature sensor is either unplugged, gone bad, or has a broken wire. It should be located near the thermostat housing.

Jul 17, 2009 | 1993 Honda Accord

2 Answers

Heating System


The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.
0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not meet specification, it must be replaced.
0900c1528008f120.jpgFig. 3: Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram 0900c1528008f095.jpgFig. 4: ECT sensor temperature vs. resistance values

Oct 01, 2008 | 1993 GMC Sierra

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