Question about 2000 Chevrolet Monte Carlo

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Low coolant light is on even though coolant is full.dont know how to replace sensor by rad.

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  • garzaw Mar 05, 2009

    i still do not understand thereis a black box by rad. how do i remove it do i drain rad. i think thats the reson i get constant low coolant signal.

  • garzaw Mar 05, 2009

    iam still cnfused how do i remove censor for loww coolant light?

  • garzaw Mar 05, 2009

    i know how to drain rad. howw do i remove llow coolant censor without damaging it?

  • garzaw Mar 05, 2009

    like to knw procedure for replacing coolant censor .

  • garzaw Mar 05, 2009

    yes i hope so it sounds o.k. tom thank you.

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7 Answers

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There are two separate sensors that play here. the "coolant temperature sensor" and "coolant LEVEL sensor". I suggest confirming which of these was replaced, as it is very common for them to be confused. likely you will find the coolant sensor that was replaced was the one on the engine (temperature); The LEVEL sensor is mounted either in the coolant resivoir or in the radiator. Probably just need the proper sensor replaced.

Posted on Mar 05, 2009

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Hello, the sensor on the radiator has a wire clip the you have to release,In order to release it you have to take all the pressure off the radiator first, by removing the radiator cap. When you remove the pressure reinstall the cap to save water when you remove the sensor. Now you can take a small screwdriver an get under the prong of the electrial part of the switch and push down. After that is disconnected procede to the wire clip. Look on the side of the switch and you will notice the clip is separated in the middle. Push down with a screw driver on the bottom side until it pops out of place.Then you have to find something to pulll up on the other side.You can take a shop rag and snag the upper side if you have to. When you get the clip off have the new switch waiting nearby, because you don't want to loose much antifreeze.
With clip unlocked twist and pull on the switch it should pop out don't pry just pull.Look at new switch make sure wire is in right place between the hollow groves.Don,t unlock it.When you get the old switch out replace it quickly, the locks should click when in place. Then reconnect electrical and refill coolant and you are done. Please rate my answer, Thank you

Posted on Mar 05, 2009

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  • Chevrolet Master
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The sensor is on the passnger side of the radiator below the radiator cap. It is black and square and has a single plug at the bottom. It is held onto the radiator by a metal retaining clip. Remove the clip and the sensor pulls out of the radiator. Disconnect the wire by pulling carefully on the plastic lock and pull on the plug. Fluid will leak out to level of sensor. Drain or place catch basin below sensor plug to catch radiator fluid. Sensor can be purchased through a dealer for around $70 US, or Aut*Z*ne for under $40 US. Your choice.

Posted on Mar 05, 2009

  • yadayada
    yadayada Mar 05, 2009

    From a factory TSB here is the cause:

    Cause

    The cause of this condition may be due to engine oil contaminating the coolant. Possible sources of oil contamination are internal engine leaks, improper service procedures, or the addition of some types of anti-leak additives to the cooling system. Once in the coolant, the oil leaves deposits on the level sensor creating an insulating film. This film results in a false activation of the coolant level indicator

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With the 5th generation Monte's gm had an issue with these.  Check your overflow tank.  If it is down, fill it.  If the light still does not go off, the coolant level sensor needs to be replaced.  This was a know issue with these cars.

http://info.rockauto.com/Airtex/Detail.html?5S1449.jpg

They are around 45 bucks.

Posted on Mar 05, 2009

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Make sure the radiatpr is full and coolant overflow reservoir is at the full mark when cold. If it is full, Check the low coolant sensor located in the radiator on the passenger side. 
First check the coolant level. Make sure its full. The sensor is quite sensitive if the level gets to low. If it is low, then you have a leak somewhere and need to persue it. If its not low, then I would suggest taking the resiviour out and cleaning it with soap and water. The sensor can sometimes get junk stuck in it. If that doesn help then a new sensor is needed however you can NOT just buy the sensor. You need to buy the entire resiviour tank. 

Posted on Mar 05, 2009

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If you look on the top of the radiator and follow the hose to the engine block you will see that there is a wire connected to your thermostat on the side. This is generally where they are. If you take that out prepare for a little (or big depending on how much coolant is in there/ cool motor). Should just be threaded in there. Make sure when you put it back in you put some tread tape on it so that i seals correctly. Plug the sensor back in and that should call it a day.

Posted on Mar 05, 2009

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  • Chevrolet Master
  • 19,396 Answers

Before replacing the coolant sensor, check the coolant level sender wiring to the instrument panel.

Posted on Mar 05, 2009

  • Ginko
    Ginko Mar 05, 2009

    The coolant level sensor is installed on the radiator, and before replacing it you should check the connector and wiring.

    See picture below on Chevy Impala, it should be similar on your car:




  • Ginko
    Ginko Mar 05, 2009

    I report the procedure to empty coolant liquid from haynes.

    However if you have never emptied fluids on your car , you should at least buy the haynes manual for your car before attempting the repair.

    Procedure below:

    if you have just driven your vehicle wait several hours before starting
    procedure to let engine cool down. Draining-put a large container under
    the radiator to catch coolant. The drain plug is located on the lower
    right side of radiator. If possible attach a 3/8 inch diameter hose to
    the drain fitting. To open the drain fitting turn counter clockwise(you
    may need to use pliers to turn it, but be careful fitting is made of a
    composite plastic). The drain plug is shaped on the order of a wing nut
    also it will not come off. It just opens enough to get a good flow.
    After coolant has drained from radiator move your container under the
    engine block drain plugs,there is one on each side of the block. After
    plugs are removed you might need to insert a phillips screwdriver to
    break thru a rust barrier that has formed. If all you are doing is
    draining the coolant and not flushing that's it. Be sure to use
    permatex or some kind of thread compound on your engine block plugs.
    Shut the radiator drain plug.



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