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Temperature gauge not working

Temperature sending unit location

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Mazda temperature gauge


When the gauge doesn't work, you have to determine, is it the gauge on the dash or the temperature sending unit on the engine or a wiring problem. Try this: find the sending unit on the engine and pull the wire off it. With the ignition key on, touch the wire to a metal ground on the engine. Does the temp. gauge move? If it does, replace the sending unit. If it doesn't move, replace the temperature gauge on the instrument panel.

Dec 23, 2013 | Mazda B-Series Truck Cars & Trucks

1 Answer

Temperature gauge don't work..


Sounds like you may have a problem with your coolant temperature sending unit or thermostat, locate your sending unit, unplug the electrical connector run a jumper wire across the 2 wires inside the connector the gauge should read hot when the jumper wires are connected and when you remove the jumper wire it should go back to cold this verifies your gauge and all related wiring are working properly, if it doesnt work as described you either have a wiring problem or a bad temp gauge, next if your heater output is suffering you more then likely have a weak thermostat staying open or partially open replace the thermostat with a new unit, however if you arent experiencing any heater trouble replace your coolant temperature sending unit because your thermostat is more then likely working properly.....

Dec 10, 2010 | Pontiac Grand Am Cars & Trucks

1 Answer

My temperature gauge is not registering and my check gauges light comes on when im at a stoplight.when im driving the oil pressure is fine but when i come to a stop or idle the check gauges light blinks on...


A faulty temperature sending unit. It should be located on or near the thermostat housing. If any of your gauges reads zero, the check gauges light will come on. Sometimes even if the fuel gauge gets too low, it will trigger the light. It may be the connection at the sending unit. It may have become loose so wiggle it and make sure it is securely connected to the sending unit. If the temp. gauge needle pegs at the top of the gauge, it means the sending unit has grounded out and is faulty. If it jumps, reads off or not at all it could be a faulty sender or a bad connection.

May 26, 2010 | Chevrolet 1500 Cars & Trucks

2 Answers

The tempertature gauge does not work on my jeep what may be the problem?


Could be the coolant temp sensor:


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4.0L engine shown




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5.2L engine shown



To test it:

Perform this test on a cold or cool engine.
  1. Disconnect the negative (-) battery cable.
  2. Unplug the electrical wiring from the sending unit.
  3. Using an ohmmeter, measure the resistance between the terminal and the sending unit's metal body
    1. Infinite resistance or zero resistance: the sending unit is bad, replace the sender with a new one.
    2. Other than infinite or zero resistance: continue test.
  4. Remove the temperature sender from the engine.
  5. Position the sending unit so the metal shaft (opposite end from the electrical connectors) is in a pot of water. Make sure that the electrical connector is not submerged and only the tip of the sending unit's body is in the water.
  6. Heat the pot of water at a medium rate. While the water is warming, continue to measure the resistance of the terminal and the metal body of the sending unit:
    1. As the water warms up, the resistance goes down in a steady manner: the sending unit is good.
    2. As the water warms up, the resistance does not change or changes in erratic jumps: the sender is bad, replace it with a new one.
  7. Install the good or new sending unit into the engine, then connect the negative battery cable.
  1. With the engine cold, remove the ECT sensor.
  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 sensor 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.

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Submerge the end of the temperature sensor in cold or hot water and check resistance


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Temperature-to-resistance relationship of the ECT and MAT sensors

Apr 28, 2010 | 1995 Jeep Grand Cherokee

2 Answers

Temp gauge stuck


sending units can be difficult to diagnose, since they sit somewhere between the sensors themselves and the temperature gauges (they may even be part of the sensors themselves, making diagnosis even more difficult). How do you know if the problem lies in the gauge itself, the sensors or the sending unit? You can always check the sensors themselves---one of the most common problems with temperature sensors located near the engine is a disconnection caused by vibration, which dislodges the sensor. If the sensor is dislodged, you can fix this problem and the sending unit should operate well.

Apr 21, 2010 | 1999 Mercury Grand Marquis

1 Answer

92 crown vic - temperature guage on the dash is not working...


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The temperature gauge sending unit is located in the front section of the intake manifold, just to the right of the alternator on the 4.6L engines. Got this from autozones repair manuals


Mar 16, 2010 | 1992 Ford Crown Victoria

1 Answer

My fuel gauge not working and temperature gauge not working


This can be a simple loose connection or your fuel sending unit is bad which is located in the tank. the coolant temperature sender is usually located on the cylinder head or by the thermostat.

Jan 21, 2010 | 1990 GMC Sierra

1 Answer

Trying to find out where the temperature sensor is located or maybe its called a switch temperature sensor. I replaced the thermostat and I was told this need to be replaced too


You would only need to replace this if your temperature gauge is not working properly. Just because the thermostat was replaced does not mean the sensor must be too.

There were three different engines offered for that vehicle and there is a separate temp sending unit for the gauge than there is for the computer(PCM). The V6 4.0 SOHC ECT for the PCM and the sending unit for the gauge are both located side by side on top of the thermostat housing. The V6 4.0 EI engine ECT is located on the front of the engine, left of the throttle body, and the sending unit is located in the front of the engine, behind the alternator bracket. The V8 5.0 ECT is located in the front of the engine, below the middle of the ignition coils and the sending unit is in the same area, but toward the driver's side of the engine below the left ignition coil.

It will look similar to this...

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Nov 14, 2009 | 1993 Ford Explorer Limited

1 Answer

Temperature gauge not working 93 chevy 3500 5.7


What engine? 350? It is in the drivers side head. Between the 1 and 3 spark plugs.

May 15, 2009 | 1993 Chevrolet C3500

1 Answer

Audi A3 2002 model auto - temperature gauge not working


The guage and fan speeds work on independant sensors. If you can remove the plastic engine cover and locate the "sending unit" for the gauge disconnect it and restart the engine. The gauge should remain cold and not move. If this is the case replace the sending unit. This should be a single wire sender located in the waterjacket of the intake manifold look in the area where the upper rad hose enters the intake.

Mar 19, 2009 | 1999 Audi A6

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