Question about 1992 GMC Sierra C3500

1 Answer

I replaced the sensor, thermostat and the temperature gauge on my 1992 GM Sierra 1500 still does not work. What could my problem be

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • GMC Master
  • 42,159 Answers

Try taking the wire of the temp sender unit and touching the engine and see if the gauge goes up to hot. If so then replace the temperature sender unit ( different to the sensor unit)

Posted on Oct 13, 2013

Testimonial: "I tried that and the gauge did not move. When I start the engine it goes all the way to hot then comes back to 100 and never moves again."

  • 1 more comment 
  • Horace Wiseman
    Horace Wiseman Oct 14, 2013

    Could it be in the wiring from temperature sender unit to the gauge. If so, what is the easiest way to check. I am at the part of just getting and after market gauge and installed has anyone done that. If so, any help would be apprecaited.

  • Horace Wiseman
    Horace Wiseman Oct 14, 2013

    Plus the Truck is a 1992 GMC Sierra 1500 5.0L

  • Bill Boyd Oct 14, 2013

    What you have said is what I suggested. I didn't mention that the ignition switch had to be on for the power to go through the gauge to the sender unit then through the resistance in the sender unit to earth. By starting the engine and the temp gauge goes up in an indication that there is a dead short ( what I suggested ) and I am convinced that the sender is the faulty bit.It works by having an internal high resistance that makes the gauge read low from low current flow and as it heaats up from the water the resistance changes to allow more current through as so you read a higher temperature. When there is extreme temp (boiling) the resistance is virtually nil and it amounts to a dead short ( earthing the wire at the sender). I say replace the sender unit .

×

3 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 29 Answers

SOURCE: 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

Posted on Oct 01, 2008

  • 141 Answers

SOURCE: the heater dont work on

it sounds like a heater door actuator is not allowing the door to swing into the heat position...as for the temp gauge there is a recall for a bad insterment cluster for that truck...a circuit board is cracked in the dash not allowing the gauge to function...call a GM dealer to get more info on this recall...the heat problem can be easliy fixed at any qualified service station

Posted on Jul 16, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Which fuse is for gauges on dashboard on a 2003 gmc Sierra 1500


Probably the temperature sending unit on the engine, not the dashboard.

Sep 27, 2014 | 2003 GMC Sierra 1500

1 Answer

My 206 serria 1500 truck doesn't put out heat, the fan works by wiggling it, but no heat


Yes it could be the thermostat or low coolant.
If the radiator is full, I would suspect the thermostat.

Dec 25, 2012 | 2003 GMC Sierra 1500

1 Answer

My truck started running poorly as the temp outside has gotten colder. It runsmeans poorly tillas operating temp. Then atu opp temp Iit trys to die at stop lights. I had replace plugs/wires/ fuel...


You have a Cold starting sequence that is similar to a choke. This system relies on getting a temperature signal back to the Computer. It should have at least 1 water sensor. Sometimes there are 2 sensors with one working the dash gauge and the other working the Cold start sequence. If you find 2 sensors just unplug 1 at a time and do this when the engine temperature has been rising. When you find the dash gauge sensor you will lose the reading on the dash gauge when it is unplugged. The remaining sensor would control the Cold start sequence, so replace that sensor.

Dec 04, 2011 | 1992 GMC Sierra K1500

1 Answer

Help needed to figure out why truck says it over heating


you might want to check the wires going to the temperature sensor on the engine make sure it hasnt rubbed the protective coating off, this can give you a false reading, the safest way is to put a manual gauge in place of the temperature sensor and run engine to make sure the engine is not overheating. You can pick up a cheap manual temp gauge at your local parts store and install the temperature probe into the hole where the temp sensor was located and run the engine. It sounds like you have a guage malfunction. But is better to be safe than sorry.

Nov 16, 2011 | 1998 GMC Sierra

1 Answer

The heater dont work on my 2004 gmc sierra 1500, engine(4.8) only the AC works in it... but the heater not anymore.... please help... and also the temperature gauge not working, it's only pointing...


it sounds like a heater door actuator is not allowing the door to swing into the heat position...as for the temp gauge there is a recall for a bad insterment cluster for that truck...a circuit board is cracked in the dash not allowing the gauge to function...call a GM dealer to get more info on this recall...the heat problem can be easliy fixed at any qualified service station

Jul 16, 2011 | 2004 GMC Sierra 1500 Crew Cab

1 Answer

No gauges or speedodometer or tach working


GM had gauge cluster problems from 2000-2005. Bad stepper motors. On those units you have to replace the cluster or rebuild it with new stepper motors. Dealership fixed mine for $150.00

Jan 05, 2011 | 2003 GMC Sierra 1500

1 Answer

The temperature gauge on my 1999 Dodge Ram 1500 is not working. The temperature sensor and the thermostat have been replaced.


Check the gauge by holding in the trip odometer reset button and turn key to run,hold button for 10 seconds this will iniate a diagnostics on all the gauges,and lights if gauge doesn't move during this test replace gauge,if it does move then check the wires on the plug at the engine coolant temp sensor (ects) you can check the sensor by using a ohms meter by unpplugging it and check ohm's or resistance when cold and then start engine as the engine warms up the ohm's reading should gradually lower as the sensor is a thermister and as it warms up the resistance will drop.

May 24, 2010 | 1999 Dodge Ram

2 Answers

Temperature warning light coming on,on a 1992 Volkswagen Golf GTI


The thermostat will show what the guage shows. the seal on the coolent bottle can be checked for tightness. so it could be a faulty sensor?

Apr 28, 2009 | 1992 Volkswagen GTI

1 Answer

Temp gauge on dash fluctuates up and down


There is an air pocket in the coolant (upper engine underneath the manifold). Some GM manifolds have a defective design that allows the coolant to leak from underneath the throttle body assembly inside the manifold. This can contaminate oil (check for caramel milkshake color on dipstick), and cause air pockets to form underneath the sensor---thus the erratic signal.

Mar 09, 2009 | 1992 Volvo 960

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

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

134 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...