Question about 1995 Oldsmobile Ninety Eight

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Where are the coolant sending units

Where are the temperature coolant sending uni. I have changed one, but the light and alarm keep saying it is hot when it isn't.

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Posted on Sep 27, 2009


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I disscennected the temperature Sensor and it still shows hot and the fan stays on still

Cooling fan will stay on if you unplug the coolant sensor. The temperature sending unit controls the gauge.Some vehicles use the same unit for both coolant sensor and temperature sending unit. Unplugging the sending unit will make the gauge go all the way to hot.replace the sending unit and see if that will solve your problem.

Dec 05, 2017 | Cars & Trucks

1 Answer

Temperature gauge on my Peugeot 207 keeps going from normal to 0 and staying there no leaks visible no coolant lose

Normal to COLD?
You would only lose coolant if the engine was overheating - or, as you say - a leak.

It's probably a faulty temperature sending unit - these are common failures. You actually have nothing to worry about. The unit sends a signal from the engine to your temperature gauge in the car. Even if the unit is faulty the engine is still operating at the correct temperature - it's the signal to the temperature gauge that is wrong.

Your temperature sensor will look something like in the image below:
26054640-ncuktxo4qw3omcx4ef1trshf-4-0.jpegIt's inexpensive and quick to rectify. A new sender unit can be fitted within minutes. Give a mobile mechanic a call ..

I read your question about the car heater.. No, the sensor wouldn't cause the heater to blow cold air. That fault is either air in the cooling system/heater system, or a blocked heater matrix.

Remove your radiator cap/coolant bottle cap. Open the heater controls to HOT and set on maximum. Start the engine and let it tick over - see if it forces any air out of the system when the heater should begin blowing hot.

If the heater still blows cold it may have a blocked matrix. Try a bottle of radiator/coolant system flush to see if that dislodges the blockage. The instructions will be on the bottle of coolant flush

Jan 15, 2016 | Peugeot Cars & Trucks

1 Answer

Engine coolant Temperature gauge fluctuates

Watch the temp gauge when the electric radiator fans come on. The temp sensor that controls when the fan comes on may be faulty.

Oct 11, 2012 | 2000 Pontiac Bonneville

2 Answers

1998 nissan maxima runs hot, replaced the thermostat and at times gauge still register hot, what else could cause this?

Its possible that your problem also stay in the Engine Coolant Temperature (ECT) sensor resistance changes in response to engine coolant temperature.

Keep in mindthat the sensor resistance decreases as coolant temperature increases. This provides a reference signal, which indicates engine coolant temperature, to the ECM.


Fig.: Compare the sensor readings with these values


Fig.: Location of the thermal sending unit (A) next to the coolant temperature sensor (B)

Keep us updated.

Oct 12, 2011 | 1998 Nissan Maxima

1 Answer

When I try to start the engine a hot message comes on at the temperature gage area, is this a sending unit default and it will be cleared by replacing the sending unit?

Does it continue to indicate "HOT" after it has started, or does it then go out? Does the vehicle also have a temperature gauge in addition to the over temperature warning light?

If the coolant level is at the correct level and the belt(s) are are correctly in place, it's most likely a bad sending unit.

Might try disconnecting the wire from the sending unit and see if this will cause the light to not come on.

Jan 30, 2011 | 1995 Oldsmobile Ninety Eight Regency

2 Answers

What makes the cooling fan come on even though my 95 z28 is not hot

A bad relay that is sticking closed causing the fan to come on or a bad coolant temperature sending unit or switch which is telling the relay to go on when not hot.

Nov 06, 2010 | 1995 Chevrolet Camaro

1 Answer

How to install a coolant temp sensor in a 1995 ford escort engine 1.9 liter

Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
  1. Locate the coolant temperature sending unit on the engine.
  2. Disconnect the sending unit electrical harness.
  3. Drain the engine coolant below the level of the switch.
  4. Unfasten and remove the sending unit from the engine.
  5. If the same sender is to be replaced, remove and discard the O-ring. To install:
  6. If reusing the old sender, install a new O-ring.
  7. Coat the new sending unit with Teflontape or electrically conductive sealer.
  8. Install the sending unit and tighten to 18–22 ft. lbs. (25–29 Nm).
  9. Attach the sending unit's electrical connector.
  10. Fill the engine with coolant.
  11. Start the engine, allow it to reach operating temperature and check for leaks.
  12. Check for proper sending unit operation.
2.0L SOHC Engines
  1. Disonnect the negative battery cable.
  2. If equipped, raise the car and remove the left-hand splash shield bolts.
  3. Loosen the petcock and partially drain the radiator.
  4. Lower the car, locate the sender and unplug its electrical connection.
  5. Unscrew the sender counterclockwise and remove it from the engine. Fig. 1: Unscrew the coolant temperature sender to remove it 90982g26.gif
    To install:
  6. Install the sender and tighten it to 13–17 ft. lbs. (17–24 Nm).
  7. Attach the sender electrical connection.
  8. If equipped, raise the car and install the left-hand splash shield bolts.
  9. Lower the car and fill the cooling system.
  10. Connect the negative battery cable.
2.0L DOHC Engines
  1. Disonnect the negative battery cable.
  2. Loosen the petcock and partially drain the radiator.
  3. Locate the sender and unplug its electrical connection.
  4. Unscrew the sender counterclockwise and remove it from the engine. Fig. 2: On 2.0L DOHC (VIN 3) engines, tighten the coolant temperature sender to 89–124 inch lbs. (10–14 Nm) 90982g27.gif
    To install:
  5. Install the sender and tighten it clockwise to 89–124 inch lbs. (10–14 Nm).
  6. Attach the sender electrical connection and fill the cooling system.
  7. Connect the negative battery cable.
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Jul 07, 2010 | 1995 Ford Escort

1 Answer

Where is the temperature sending unit located on a 2000 chevy s10 2.2 four cylinder engine

The temperature sending unit is screwed into cylinder head. Careful you also have a coolant temperature sensor that threads into intake manifold. Temp sending unit is how your guage knows how hot your engine is. Coolant temp sensor is how your computer knows how hot or cold your engine is, so it can compensate fuel & air mixture.You can not put the wrong one in the wrong place, they will not fit. You change 1 for 1 reason & the other for another reason.

Jun 16, 2010 | 2000 Chevrolet S-10

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