Question about 1998 Chevrolet Cavalier

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Temp gauge I have a 98 cavalier and the temp gauge keeps going from the middle to below cold and the engine light came on and the code was coolant temp high input,I replaced the sensor in the coolant line and it still does it.

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  • Anonymous Jul 12, 2008

    i have same problem and replaced thermoal stat and still doing it...

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The sensor you replaced was the ECT (engine coolant temp)? Check your coolant level and air in the lines. Do a coolant pressure test to make sure the cooling system holds pressure, If it doesn't, you may have a head gasket problem.

Posted on Jun 11, 2008

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Posted on Jan 02, 2017

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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 !

May 29, 2017 | Ford Cars & Trucks

1 Answer

My 2004 chevy cavalier temp gauge goes to the middle as soon as i turn the car on and then to heat it's not overheating i got the cooling flush and the radiator serviced and replaed the thermastat what...


It could be a simple as a coolant temperature sender. I'm not sure where yours is located on your car but alot of Chevrolets have two of them. One for the gauge and one for the ecm. If you know where it is just turn your key on and let your gauge do its thing and then unplug the temp sender. If your gauge pegs out or drops to zero that is probably your problem if it is reading in the middle and the engine is cold. You could have a problem with the gauge as well but start with sender.

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Check engine light code p0118


The P0118 is a Engine Coolant Temperature (ECT) Sensor problem. Click on the link below to view how to correct it:

http://www.gminsidenews.com/forums/f53/98-cavalier-code-po118-ect-sensor-circuity-high-voltage-36261/

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1 Answer

I have a 2003 volkswagen jetta, no owners manual, outside temps have been really cold, below the temp gauge a temp light comes on and a chime sounds, temp gauge runs fine, had a friend ck coolant, it...


does it do this first thing when its cold out ?? if so, fill the coolant res to the max line when cold, if light still comes on, it could be either the coolant leven sensor (my guess) or the temp sensor for the engine- these are known to go bad every few years

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My temp gauge keeps going into the red what can cause it


check coolant level with engine cold an add coolant if required. Replace thermostat if coolant ok.

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1 Answer

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If it's like my 98 cavalier it's located in the housing where the upper radiator goes into engine, it's right beside it.

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At highway speed over 65 MPH the temp gauge goes to near redline,


u have too burp the system on 1 of the return lines u will see a pipe with a little screw in it let it idle hot shut off then unscrew bolt slightly untill it runs out [antifreeze] repeat there could be a high and a low return

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1 Answer

1997 2.4L Chevy Cavalier LS; Low Coolant Indicator and Temp Gauge


take the cap off of the radiator (whil engine is cold) start and run the vehicle. keep runnig 30mins after the vehicle is hot keeping notice of the rad fluid level.
keeping the cap off will prevent the pressure build up that woiuld keep the air in the system, keep adding water or antifreeze as the level goes down. this may take an hour or so.
also with the cap off, you will be able to see if your water pump is operating correctly. you will visibly be able to see movement in the rad when the pum is engaged.

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1 Answer

97 Cavalier engine coolant light.


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