Question about 1996 Subaru Legacy

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96 legacy - does the coolant temperature sensor drive the dash temperature gauge

Codes indicate a new coolant temp sensor is needed. Temp gauge is very slow to indicate anything. do these things relate or is a thermostat also indicated.

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6ya6ya
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Posted on Jan 02, 2017

Benimur
  • 6966 Answers

SOURCE: engine overheat

Hi and welcome to FixYa,

Offhand it would appear that the radiator fan is not working. In some versions, either the A/C or the heater must be turned on for the radiator fan to work. In some other incidents, the fan utilizes a clutch. Common design makes use of the inverse property of silica oil to serve as the clutch. Still others have a relay that actually does the switching on of the fan. Of course it would be to your advantage to likewise check the temperature sensor on the radiator.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 07, 2008

  • 124 Answers

SOURCE: Temperature Gauge Always On Cold

As long as your gauge is still moving up, there's no real problem. You have heat coming from the heater. It's only a problem if it's getting too hot. What's going on is that you don't let the vehicle run long enough, and it's so cold outside that the engine stays cold. It raises in temp when your stopped because there's no airflow through the radiator. The thermostat just heats up the engine block, and won't change the reading on the gauge. When this goes bad your car will overheat in just a few miles.

Posted on Mar 26, 2009

  • 1 Answer

SOURCE: Intermittent overheating 96 Subaru Legacy.

if it overheats while your in motion then u can eliminate your fans, as your problem. and do you mean 5-50 thousand miles? id chech your coolant for hc contamination. most likley a head gasket

Posted on Apr 05, 2009

  • 34 Answers

SOURCE: 1996 Subaru Legacy overheating in strange way

Was the water pump brand new or rebuilt? I have seen rebuilts fail on the first test drive.
Before pulling the head, I would take it to a shop and request a CO2 test to check for combustion gasses in the cooling system. Shouldn't cost more than $30 and is a pretty definative test.

Posted on May 18, 2009

  • 5 Answers

SOURCE: OVERHEATING!!!!

Since you changed your waterpump, you need to do an air bleed...
This is INSANELY important!
The airbleed is mounted on the top of the radiator on the passenger side.
Its made of plastic, has a seal, and looks like a 1/2 inch (12mm) philips screw head.
To do this, make sure the engine is cold and not running.
Use a large FLAT HEAD screw driver and turn it counter clockwise.
It might be very tight, so be prepared for a bit of torque to turn it!
Unscrew it, and look in the hole.
Coolant should be at the top of the bottom of the screw hole.
It should be low, so add coolant to the open hole.
While doing this, be sure the radiator cap is off so you can balance the fluid level properly.
Why do you need to bleed the system?
The engine has a slight tilt upwards toward the radiator, and both your waterpump, and block will have a tendancy to leave air near the top of the block and heads.
This is a common mistake on several makes after a coolant change.
Make sure all fluids are topped off, fill the overflow tank to its max level indicated on the tank itself and your done.
Provided you havent been driving long on the car in this condition, it shouldnt blow a headgasket.
A good way to know if the headgasket is bad is the radiator cap will have a brownish "slime" indicating combustion gasses are getting into the cooling system.
IF this is the case, your engine is pumping combustion gasses into your system and no amount of air bleeding with help.
Another tell tale sign of coolant being pressurized, is a overflowing "overflow" tank, and a sudden blast from Normal operating temprature to HOT, and then suddenly.. it goes back to Normal again.
There is usually a "gurgling" sound under your dash..
Lets assume you just need to do an air bleed, and things will go back to normal.
Also, if your airbleed screw has alittle coolant leaking around it, replace it with a new one as the seal and plastic have worn due to age.
Good luck!

Posted on Aug 28, 2009

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Does the 98 Ford F-150 5.4 triton have two coolant sending units? I found the one on the intake and replaced it and still no gauge.


Has CHT - cylinder head temp. sensor . This sensor is a input to the PCM - engine computer . The PCM sends engine temp info on serial data network to the instrument cluster . I/C has a microprocessor inside . Have it check for DTC'S - diagnostic trouble codes . Not OBD2 codes , B - body codes . The gauge could be the problem , which means replacing the instrument cluster .
Engine coolant temperature information is received by the instrument cluster from the PCM over the SCP network. Temperatures over 121°C (275°F) will display hot (H). If the engine coolant temperature data is missing or invalid for five seconds, the instrument cluster will move the engine coolant temperature gauge below the cold (C) position.
The best way to diagnose this is with a scan tool , factory or a professional type . Know how the system works and not replacing parts is the proper way to diagnose .
U1073 D073 SCP (J1850) Invalid or Missing Data for Engine Coolant PCM CARRY OUT the PCM self-test.
  • A single gauge does not return to zero with the ignition switch off
  • Instrument cluster.
  • INSTALL a new instrument cluster; REFER to Instrument Cluster . TEST the system for normal operation.

  • Incorrect temperature gauge indication
  • Circuitry.
  • Instrument cluster.
  • PCM.
  • Engine coolant temperature sensor.
  • GO to Pinpoint Test F .

I should also point out that if the temp sensor were bad the vehicle may not run right .
Using the factory scan tool
Trigger instrument cluster active command ENGCOOLNT. Monitor the engine coolant temperature gauge while adjusting the ENGCOOLNT active command to read 50% and 100%.
  • Does the temperature gauge start at cold, move to half at 50%, and full hot at 100%?
Yes REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No INSTALL a new instrument cluster; REFER to Instrument Cluster . REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
Your best bet , take it to a qualified repair shop !

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One advantage us dealer tech's have over a week end warrior is that we have factory service repair information and have factory scan tool ,Tech 2 , to check data coming into the instrument cluster . Most of you probably don't even think about how that coolant temp infor shows up on the gauge , except by a coolant sensor !

High Temperature Indicator
The high temperature Indicator function handles the control of the Engine Temperature Gauge Display and the red High Temperature indicator. The Powertrain Control Module (PCM) reads the Coolant Temperature Sensor, filters the messages, and sends the coolant temperature to the instrument cluster via a Class 2 serial data message. The PCM monitors the coolant sensor in order to determine a fault. The PCM transmits the Class 2 serial data coolant temperature report messages to the instrument cluster for the temperature gauge display and for the high temperature indicator control.
The instrument cluster receives the engine temperature data in the Class 2 serial data message from the PCM. The instrument cluster converts this data into a temperature gauge pointer position which drives the gauge pointer. The instrument cluster also uses this data in order to determine the high temperature indicator control.
The Body Control Module (BCM) looks for the high temperature indicator Class 2 serial data report from the instrument cluster and triggers a chime when the indicator is ON.

Your best bet , take it to a qualified repair shop , rather then just replacing parts .

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normally one
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it is used to repot engine coolant temperature to the ECM so that air/fuel mixture can be adjusted and the fans switched on through a relay
don;t confuse it with a coolant temperature sender which has 1 wire and works the temp gauge

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Hi Janice , Before I say where the coolant temp. sensor is I'd just like to make you aware of a couple of thing's before you replace this sensor needlessly .It's one thing if you have a DTC diagnostic trouble code for the sensor but another if your temp. gauge isn't work ! You see the coolant temp. sensor is an input to the engine computer , not directly to the temp. gauge.
The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine coolant temperature. The engine coolant temperature gage defaults to 100°F (40°C) or below if: ?€¢
The ECM detects a malfunction in the engine coolant temperature sensor circuit.


?€¢
The IPC detects a loss of serial data communications with the ECM.

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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.

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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

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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.

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I would change the temp sensor and first make sure the coolant is full in the rad with no air in the system.

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There are two sensors connected to the thermostat housing and i need to know which sensor is which and what they control. on cold days i cant get started


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