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Why is my temp gauge not reading temperature w brand new coolant temperature sensor

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  • Cars & Trucks Master
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What make , model and year vehicle ? Could be the gauge is bad !

Posted on Aug 09, 2017


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Posted on Jan 02, 2017

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SOURCE: coolant temperature sensor location for 1999 Dodge Durango

The sensor is right next to the heater hose outlet on the front passenger side of intake manifold. It is very small with an oval shaped connector going to it. I have the same engine.

Posted on Oct 21, 2008

  • 1 Answer


On my 2001 Focus Zetec 2.0L, the radiator fan only worked with the air conditioning turned on (as in no low speed - engine would overheat while idling or in traffic, but was fine as long as the A/C was on). The fix was to replace the radiator fan resistor assembly located in the fan shroud between the fans.

Posted on Nov 12, 2008

  • 218 Answers

SOURCE: Where is the coolant temperature sensor located on 2000 Altima?


Posted on May 07, 2009

  • 534 Answers

SOURCE: 2001 dodge stratus engine temperature gauge spikes occasionally

Look for a loose connection to the temperature sender unit on the motor.
If all connections OK, you may need a new temp sender unit.

Posted on Jul 28, 2009

  • 55 Answers

SOURCE: Chevy Silverado 06 -Temperature gauge vary

The sensor is next to where the upper radiator hose meets the engine

Posted on Nov 23, 2009

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Engine temp gauge not reading and ac will not turn on due to engine hot warning, diognostics say its a sensor, need to know which one and can i do it myself?2003 saturn vue

What diognostics say its a sensor ?????? No diagnostic's ever tell's you it's a sensor . You as a technician would need to prove that by testing electrical circuits , viewing coolant temp sensor . Hooking scan tool and trying to command the gauge with by directional control . The temp gauge not showing any temp. ? No movement ? Engine Coolant Temperature Gage Inaccurate or InoperativeStep Action
Schematic Reference: Instrument Cluster Schematics
Did you perform the Instrument Cluster Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Instrument Cluster
Install a scan tool.
Turn the ignition ON, with the engine OFF.
With the scan tool, perform the Lamp and Gauge Check in the IPC Special Functions list.
Does the engine coolant temperature gage move up and down when commanded?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
Replace the IPC. Refer to Instrument Cluster Replacement .
Did you complete the replacement?
Go to Step 4
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2
Would hate for you to replace the coolant temp sensor an find out that's not the problem ! Does the vehicle start an run good ,trans mission shift good ? If so it's not the coolant temp sensor .
Engine Coolant Temperature Gage
The ECM sends coolant temperature as determined by the coolant temperature sensor to the BCM via CAN serial data. The IPC displays the engine coolant temperature with the gage when the BCM sends a class 2 message to the IPC indicating coolant temperature percentage. The engine coolant temperature gage defaults to cold (0°) or below if:
• The ECM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of class 2 communications with the BCM.
• The BCM detects a loss of CAN communications with the ECM.

Aug 19, 2017 | AC Cars & Trucks

1 Answer

Code active, unplug coolant sensor dash gauge stops reading

What make vehicle ? some vehicles have two coolant sensors . One for temp. gauge an another one for the ECM / PCM input. Do you have a check engine light lit ?

A DTC will be set if an abnormal reading occurs, P0116 for sensor performance, P0117 low input or

P0118 for a high input. The coolant temperature sensor temperature reading should closely match the

air charge/manifold temperature reading on a scan tool if the engine has not been run for over an hour.
The sensor circuit can be checked for proper voltage using a voltmeter.

Jun 03, 2015 | Cars & Trucks

2 Answers

What is wrong the temp does not get hot going down rasd

I would buy a new thermostat and flush the radiator coolant. Dexcool (The orange coolant) is known to clog up the internals including the temperature sensor in cars of your age.

While you are at it, I would strongly consider changing radiator hoses and clamps unless that was done recently.

If you are referring to the dashboard temperature gauge not moving...It means that your temperature sending unit may be faulty (or it's not plugged in). Dexcool is known to clog up the internals including the temperature sensor in cars of your age. Inspect the connector to the temp gauge for damage and replace the temp gauge.
A replacement temp sensor is about $15 at any auto parts store.

Good luck

Feb 24, 2015 | 2004 Buick Rendezvous

1 Answer

Why does the temperature gauge on my 1995 Chevy K2500, 5.7L read 150 degrees ?

If you replaced the SENSOR and not the gauge SENDER, there's your answer.

The SENSOR sends the computer (ECM, PCM, ECU, etc.) the engine temp so it can make the adjustments to the fuel, timing etc.

The gauge SENDER makes the gauge read what temperature the engine coolant is.

Hope the helps.

Feb 21, 2015 | 1995 Chevrolet K2500

1 Answer

I have a 2007 Chevrolet Equinox and had my cluster repaired for the temp gauge. Now it works but will not drop the entire way after it cools down. I was told that this is a temp problem with GM vehicles...

From what I just read about your vehicle,it has a history problem with the gauge,may be the coolant temperature sender or the gauge,it says the whole cluster will have to be changed to be fixed if the gauge is bad,found some forums and all had gauge problems.Right above the coolant temperature sensor is the coolant temperature sender,this is what sends the temperature to your gauge,the sensor sends a signal to the computer,they may have replaced the wrong one,here's a link to the sensor,the hole above it is where the sender goes,it's a one prong part,the sensor is a 2 prong part.A lot of people don't know that there are 2 types of coolant temperature gauge sending unit and sensor.

Nov 06, 2013 | 2007 Chevrolet Equinox LS New Cars

2 Answers

96 park ave temp only gets 160 replaced stats twice

If the temp gauge is reading 160 when the engine is warmed up, the problem could be air in the cooling system, a faulty sending unit, or gauge.

Dec 09, 2012 | 1996 Buick Park Avenue

1 Answer

1999 chrysler voyager 2.5 td cooling fans

if i disconect temp sensor fans come on cool engine but then no temp gauge

That's what I'd expect after unplugging.
This is sounding like a bad coolant temp sensor. Test it or replace it before you do anything else. Read this post on how to test an engine coolant temperature sensor

Test engine coolant temperature sensor Ricks Free Auto Repair Advice

Nov 05, 2017 | 1998 Dodge Caravan

1 Answer

Temp Gauge inside car "sticks"

Yadayada ,don't know where you came up with that . This vehicle has just one ECT - engine coolat temp. sensor . It's an input for the PCM - engine computer . The PCM sends this info to the instrument cluster over the class2 serial data bus. . The proper way to diagnose a problem like this would be to hook up a professional scanner an check input data to the PCM , an instrument cluster . Not guessing an replacing parts .
Engine Coolant Temperature Gage
The IPC displays the engine coolant temperature as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the engine coolant temperature. The engine coolant temperature gage defaults to 60°C (140°F) or below if:
• The PCM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.

What engine ? could have come with a 3.4 or 3.8 L .
Engine Coolant Temperature (ECT) Sensor (L36)
Left side of the engine, below the thermostat outlet

Engine Coolant Temperature (ECT) Sensor (LA1)
LH side, top of the engine

Both are close to the thermostat housing , do you know what an where that is ? Follow the top radiator hose to the engine , should be near there . Look at the new part ,can't you match it up.

Jan 02, 2018 | 2001 Chevrolet Monte Carlo

1 Answer

2001 Jeep Grand Cherokee Engine temg gauge not working

If you changed the coolant temperature sensor and it had a 5 volt ref signal to it then you replaced the wrong part. You need to replace the coolant temperature sending unit.  The coolant temp "sensor" is an input to the ECM for your fuel injection system. The coolant temp "sending unit" is for coolant temp reading at the gauge, It is an NTC switch (negative temperature coefficient) which means as temp increases/resistance decreases. 

Dec 19, 2008 | 2001 Jeep Grand Cherokee

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