Question about 2001 Pontiac Aztek

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Where do I locate the collant temp senor that connects to computer system. Radiator fans not coming on and code indicates low coolant temp, but dash temp gage reads actual temp

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Hi standing in front of the car looking at the engine it's on the top right side of the engine,next to the top radiator hose inlet.




3.4L Engine



NOTE Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

  1. Drain the coolant below the level of the Engine Coolant Temperature (ECT) sensor.
  2. Disconnect the sensor electrical connector.
  3. Carefully remove the ECT sensor.

    where do I locate the collant temp senor that - 0996b43f80205354.jpg enlarge_icon.where do I locate the collant temp senor that - enlarge_tooltip.gif><span><img src= Fig. Removal and installation of the coolant temperature sensor

To install:


NOTE Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.


NOTE Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

  1. Coat the threads with sealer P/N 9985253 or equivalent.
    NOTE Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  2. Install the ECT sensor and tighten the sensor to 15 lb-ft (20 Nm).
  3. Connect the ECT sensor electrical connector.
  4. Refill the cooling system

Hope this helps,Thank You for using fixya..iluv2fish....Ray....

Posted on Jul 10, 2010

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Sounds like u need to replace the fan relay switch which is located on the fans.

Posted on Jul 10, 2010

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The temp sensor is located on the rear of the engine top of the intake. Look on the left rear engine where the intake manifold meets the cylinder head. you will see a 2 wire sensor. what was the code.? the ecu controls the gauge and it gets its reading from that sensor. you may have a different problem

Posted on Jul 10, 2010

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1 Answer

Radiator checked and no leaking - collant light comes on in dash-board display and the coolant in resovoir is low with no apparent leaking found???


You might have the leak in the system which comes effective as the engine warms up and the SEALED SYSTEM oozes off as steam from any of the joints, the radiator or the engine gaskets.
Top up the coolant and let the engine warm up on idling while you check for possible leaks in all the areas , water pump, engine and radiator.
Check also the pressure cap on the radiator, if required change as it must open up only at required temperature.

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With cold engine, open radiator cap. Fill with antifreeze directly in radiator. Start engine, top up rad if level drops. Put heat control on Hot. Fan on low, heat on high. Gently rev engine and top up rad as needed. IF as engine heats up, it starts kicking fuild violently out of radiator, then the thermostat is bad. if not, then recap radiator, top up overflow bottle and you're done. Look under car for any sign of leaks. Steady dripping indicates a leak, then address that.

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I would first check the cooling fans. To do this unplug the fans and use two jumper wires to hook them direct to the battery and test. If the fans are working I would have the radiator cleaned or purchase a new one. To clean the radiator take it to a professional and tell them you would like it rodded out. You can purchase a new one for about twice the price. I wouldn't worry about the low coolent sensor. By it being on it will not send a message that your vehicle is overheating. If you have changed everything that you say you have and the fans work and radiator is cleaned you may have a blown head gasket. If you have a blown head gasket you would see steam comming out of the tail pipes or water in the oil on dip-stick. Good luck.

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I have a Pontiac Montana (2000). That on my way to work the low coolant level light came on. and after work when I started it up the light did not come right away but it came on and there was no heat and...


No. It is not the thermostat. You are just low on coolant. The reason for the low coolant is either the fan is not working, the head gasket is blown, or the coolant system has a leak.
The fan is easy to check. When the temp comes up then the fan should come on.
The head gasket is easy to check also. Your oil will be milky white.
And if the radiator, radiator hose, or gasket leak can be harder to find.
The heater not working is because there is not enough water to heat the heater core.
PLEASE RATE. By checking Four thumbs ups!
Thanks! Have a GREAT DAY!

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1 Answer

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Bleed the air out of the coolant system,and add more coolant,to radiator,and reservoir,and make sure the cooling fans are coming on,if the low coolant light stays on,remove the low coolant light sensor,and clean it off,it is located on passengers side in the radiator,it has a wire clip you have to remove,and dont loose it,after cleaning it,put the clip back on the sensor,and push the sensor back in the hole.

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I have a red warning light that is activating on my 1999 Malibu Dash. It is on the lower right hand side & looks like a low water indicator. My fluid levels all seem fine.


If your collant level is ok, check your coolant level sensor. Its located on the coolant reservoir, usually at the bottom!! If faulty it will illuminate the low coolant indicator.

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Radiator fan not working replaced relay,temp


You didn’t mention replacing the temperature sensor located on the block in the path of the ‘cooled’ coolant.
I can’t tell you any closer where to look for it since you didn’t specify which engine you have.
This device is a solid state item called a thermistor.
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Radiator Electric Fan Motor on a 2003 Buick Century won't come on when temp gets high


I have a 1997 Buick Century with the same problem. Both my fans work if the A/C is
on as they should. If your turn off the A/C the passanger side fan will not come on
and at an idle the coolant in the radiator will boil, you can hear it in the overflow tank.
If you are driving there is enough air flow thru the radiator that the coolant doesn't
boil and the car doesn't overheat. I have replace the water pump, the thermostat.
and the ETS or engine temperature sensor mounted just above the thermostat in
the thernostat housing, to no avail, I still have the same problem. The only other
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to the fact you have to pull the radiator in order to replace it, which is a major
undertaking. I have a low coolant indicator on all the time on the dash so I have
a pretty good idea the coolanat level sensor is bad. The coolant level is not low
so that sensor is not working as it should. I hope this may help with your problem.
To test you fan raise the hood when it is cold and top off the radiator and fill the
overflow tank to the cold mark. Start the car and let it idle with the A/C off and
see if the drivers side fans comes on. It will have to get to operating temp
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replace the thermostat and the Engine Temperature Sensor at the thermostat
housing with an A/C Delco Engine Temperature Sensor. Good Luck..

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