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Engine runs hot I am thinking the engine coolant temperature sensor needs to be replaced where is it located?

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I could be of more help if I knew the year make and mode. It will be somewhere on the engine block. If it indicates normal when the car is cold and then gets hot, I would suspect it is working and take a look at the thermostat as the problem.

Posted on Apr 20, 2015

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  • Cars & Trucks Master
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What is a year and mileage ,thermostat,coolant level,radiator,water pump.

Posted on Apr 20, 2015

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6ya6ya
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Posted on Jan 02, 2017

  • 25 Answers

SOURCE: location coolant temperature sensor 4.2 liter envoy ?

COOLANT TEMP SENSOR IS MOST LIKELY BAD. NEED TO CONNECT TO THE OBD CONNECTOR WITH A COMPUTER AND SEE WHAT TEMP THE COMPUTER IS SEEING.

Posted on Mar 22, 2009

  • 119 Answers

SOURCE: replacement of coolant temperature sensor

located under intake in water crossover pipe,you can access the sensor by removing intake chamber box,then pcv hose connected to the block,the connector is orangeish 2pin,use a 19mmdeep socket on a 3/8 ratchet to get it loose,make sure engine is cool,also make sure there is a new brass washer with your new sensor,sometimes the old washer comes off when removing the sensor,sometimes it sticks to the pipe,some coolant will escape so make sure to top it off

Posted on Jul 14, 2009

  • 169 Answers

SOURCE: sensor locations

air intake look at snorkel it could be part of mass air flow check intake for eng coolant

Posted on Aug 29, 2009

Zeevert
  • 373 Answers

SOURCE: need to locate and replace coolant sensor

If you are refering to the coolant level sensor (causes low coolant light to turn on), it is located on the radiator near the battery on the passnger side. It is on the radiator tank, just below the radiator cap and the upper connection for the transmission line. Heres a picture of the sensor on my 2002 Impala when I removed the radiator (it's the square thing in the center of the picture):

07b01b9.jpg

Posted on Jul 14, 2010

emissionwiz
  • 75814 Answers

SOURCE: '08 silverado. dash board diplays, engine running

P0128 OBD-II Trouble Code Technical Description

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
What does that mean?

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.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook 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:

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


Posted on Oct 26, 2010

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1 Answer

Coolant sensor


Jeff, you haven't said what the problem is or what vehicle you have.

However, be aware that some vehicles have two coolant sensors.

One sensor sends a signal to the ECU to help control the running of the engine. The other sensor sends a signal to the temperature gauge on your dashboard - it shows you what temperature the engine is at - i.e cold, normal or hot.

If your vehicle has two coolant sensors, failure of the first type would more than likely illuminate an engine check light.

Failure of the second type would cause the dash temperature gauge to permanently read cold or hot, irrespective of the true engine temperature.

To locate this second type of sensor, look in the area of the thermostat housing. It screws into the engine block and will have 1 or 2 wires connected to it.

The link below shows generic images of this second type of sensor:

coolant temperature sensor Google Search

Apr 18, 2016 | Cars & Trucks

2 Answers

P0128 came back after replacing t-stat


code p 128 refers to coolant thermostat---coolant temp below thermostat regulating temperature ====causes --mechanical fault
you say that you have replaced the thermostat and it is just under 210 F which is 99 c or almost boiling point
you will have to investigate why it is running so hot.
check that you put the thermostat in correctly ( bulb section to block/head water
Next point --the codes are originated by the coolant temperature sensor ( puts the fans on and sets the ECM fuel/air ratio for the engine ) so to get it off you will need to reset with a scan tool

Dec 24, 2015 | 2005 Chevrolet TrailBlazer

2 Answers

Where is the 98 Lincoln mark 8 cooling fan relay.


Does it run when the engine is cold, how about with just the key on engine off

Jun 20, 2014 | 1998 Lincoln Mark VIII

1 Answer

Where is the coolant temperature sensor located on 1990 pontiac transport


The Coolant Temperature Sensor is located: Under hood, driver side, upper engine area, front of distributor, mounted in intake manifold

Sep 09, 2012 | Pontiac Trans Sport Cars & Trucks

2 Answers

1998 nissan maxima runs hot, replaced the thermostat and at times gauge still register hot, what else could cause this?


Its possible that your problem also stay in the Engine Coolant Temperature (ECT) sensor resistance changes in response to engine coolant temperature.

Keep in mindthat the sensor resistance decreases as coolant temperature increases. This provides a reference signal, which indicates engine coolant temperature, to the ECM.



10_12_2011_2_44_56_pm.gif

Fig.: Compare the sensor readings with these values



10_12_2011_2_47_01_pm.gif

Fig.: Location of the thermal sending unit (A) next to the coolant temperature sensor (B)

Keep us updated.

Oct 12, 2011 | 1998 Nissan Maxima

1 Answer

2005 mini cooper running hot. the fan is not coming on


hi it could be your coolant level has dropped to far for the sensor to operate the fan to work ,so top up the coolant by removing the coolant cap and topping it up and run the engine with the cap off and the heater switched to hot but with the fan switched off till it has warmed up and all the air is expelled from the system if that doesnt help you need to locate the coolant temperature sensor and replace it good luck

Mar 06, 2011 | 2005 Mini Cooper

1 Answer

Where is the temperature sensor for the temperature gage


Engine Temperature Sensor Operation:00116_engine_temp_sensor.jpgThis sensor monitors the temperature of the engine and sends that information to the engine control computer to regulate the amount of fuel needed - more if engine is cold and less if it's hot. The signal generated can also be sent to the temperature gauge as a visual indicator of overheating and imminent danger

I checked with autozone.com and their site says that the engine temperature sensor is not used on both engine sizes available for this vehicle.

The Coolant Temperature Sensor is used though. So maybe it has a dual purpose on your vehicle.

Coolant Temperature Sensor Operation:00113_coolant_temp_sensor.jpgThis sensor monitors the temperature of the engine and sends that information to the engine control computer to regulate the amount of fuel needed. More fuel is needed if the engine is cold; less if it's hot. If the temperature is extreme, the signal will be sent to the temperature gauge as a visual indicator of overheating and imminent danger.

Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
  • Disconnect the negative battery cable.
  • Unplug the ECT.
  • Then, unscrew it.
  • Reverse the removal procedures to install the new part.
  • Connect the negative battery cable to the battery.









Nov 03, 2010 | 1995 Chevrolet Caprice Classic

2 Answers

Radiator fan not working


CHECK FUSE AND RELAY.IF ALL IS GOOD.HOT WIRE COOLING FAN USING JUMPER WIRES.USING CAR BATTERY.IF FAN RUNS.ITS GOOD.IF FAN DONT RUN.REPLACE FAN ELECTRIC MOTOR.ALSO SCAN IT. TO MAKE SURE COOLANT TEMPERATURE SENSOR IS NOT OPEN.MAKE SURE ENGINE COOLANT TEMPERATURE SENSOR AND COOLANT TEMPERATURE READS SAME ON SCANNER IF NOT REPLACE THE COOLANT TEMPERATURE SENSOR. SEE IF COOLANT TEMPERATURE IS BAD THE COOLING FAN OR FANS WONT RUN.

Sep 07, 2009 | 1997 Plymouth Voyager

1 Answer

Coolant temp sensor located on a 2004 dodge ram 1500 4.7


YOUR ENGINE OPERATING RATING TEMPERATURE SUPPOSE TO BE 190 TO 200 DEGREES. IF COOLANT SENSOR DEGREES IS SHOWING 190 OR 200 DEGREES IT WORKING.THAT RIGHT.IF ITS SHOWING 60 OR 80 DEGREES IT FAULTY. AND ENGINE WILL RUN POORLY.

Jul 30, 2009 | 2004 Dodge Ram 1500

1 Answer

Replaced cracked radiator in 2000 Chrysler LHS but car still overheating. What could be the problem?


fix the radiator first.because coolant temperature sensor need to be in antifreeze.when antifreeze get up to 190 degrees. the coolant sensor act as a thermostat.it resistance decrease then the pcm will command cooling fans to run.if antifreeze low the coolant temperature sensor not going to work. engine is going to over heat.

May 29, 2009 | 2000 Chrysler LHS

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