Question about 1991 Ford Explorer

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No signal to temp. gage./// where is temp. sending unit located?

Heater is putting out a huge amount of heat. Could my engine be overheating?

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  • Anonymous Mar 19, 2014

    temp gage not working need to know location of sending unit

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After you've drriven the vehicle for a while, stop, turn off the ignition and open the hood. Do you hear water boiling in the radiator or is the coolant recovery bottle overflowing[you'll see plenty of steam this time of year]. If you don't see any signs of overheating then it's not a problem.

Posted on Jan 09, 2009

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Posted on Jan 02, 2017

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I have a 2001 dakota that is overheating. put in new thermostat, didnt help. put in new water pump, still overheating. finally replaced the radiator. still is overheating. what else can I do to fix it


Sometimes when you open cooling system, air gets in, it can cause problems with temp gage.
How hot does it get in degrees F? Is the coolant boiling over? Are you losing coolant? Use a non-contact infra red temp gun to take engine temp, At least we will have a degrees F reading. Most temp gages say hi or lo, cold or hot. I don't know about yours?
Can you check for combustion gases in the coolant?

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Could be the sending unit in the tank, or the gauge on the dash. A mechanic would check the signal from the sending unit at the tank.

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1998 Toyota Camry 4 cyl.only blows warm air from heater when car is unning for say ten min. When I start driving the temp gage goes down to cold and blows cool air, no heat. I changed thermostat and...


Your radiator cooling fan will only come on when the engine temp has reached the point where it needs to have air forced through the radiator and thus bring engine heat back down to safe operating range. If your heater is not working check to make sure the fresh air vents aren't stuck open (are the controls stiff or not going all the way across?) check also that the heater shutoff valve lever which is usually situated on the firewall at the rear of the engine and can be found easily by tracing the hoses back from the thermostat housing aren't bent and/or seized up.

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Where is it located and what does the oil sending unit do?


Your oil sending unit is located somewhre on the engine. It will be round and about 1 to 1.5 inch across. It will have a wire attached to the top of it. I dont know the specific location on your particular car.

What does it do? It is a diaphram operated device that sends a signal to your oil gage or warning light. The engine side is exposed to oil pressure in the engine. The oil presses against the diaphram. The diaphram is attached to a variable resistor device that operates the gage. Low pressure on the diaphram -= low signal to the gage; Hight pressure on the diaphram = high signal to the gage.

Does this answer your question?

Thank you for your interest in FixYa.com

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if the engine is not over heating then the gage is in need of replacing.

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Where is the temperature sensor for the temperature gage


Engine Temperature Sensor Operation:00116_engine_temp_sensor.jpgThis sensor monitors the temperature of the engine and sends that information to the engine control computer to regulate the amount of fuel needed - more if engine is cold and less if it's hot. The signal generated can also be sent to the temperature gauge as a visual indicator of overheating and imminent danger

I checked with autozone.com and their site says that the engine temperature sensor is not used on both engine sizes available for this vehicle.

The Coolant Temperature Sensor is used though. So maybe it has a dual purpose on your vehicle.

Coolant Temperature Sensor Operation:00113_coolant_temp_sensor.jpgThis sensor monitors the temperature of the engine and sends that information to the engine control computer to regulate the amount of fuel needed. More fuel is needed if the engine is cold; less if it's hot. If the temperature is extreme, the signal will be sent to the temperature gauge as a visual indicator of overheating and imminent danger.

Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
  • Disconnect the negative battery cable.
  • Unplug the ECT.
  • Then, unscrew it.
  • Reverse the removal procedures to install the new part.
  • Connect the negative battery cable to the battery.









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Can hear gurgling water in heater core when I rev motor. heats good then goes cold and the temperature gage goes staight to hot. Cut off engine and restart and the temp is fine. new water pump, heater core...


you didn't say that you replaced the thermostat....sounds as if it is sticking. You can always remove it and put the housing and such back together (w/o the thermostat), you won't have heat; but this will tell you if the thermostat is the problem or not. Also there is a temp sending unit....usually around the thermostat housing - indicated with a elec. plug running to it. It would be a good idea to remove it from the housing and clean/replace it, the sending unit can also make the engine run terribly if not working properly, and decrease gas mileage significantly.

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1 Answer

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If you unplug temp sending unit and turn ignition on check guage. It should read all the way hot or cold. If so then replace temp sending unit.

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Probably the temp sending unit not sending the message to your gauge.Try replacing the sending unit.

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