Question about 2001 Chevrolet Impala

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2001 Chevy Impala code P0118 what does this mean? I already changed the sensor and the thermostat. Still overheats

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  • yadayada
    yadayada Jul 04, 2010

    this means that the engine is overheating, is it?

  • acambridge Jul 05, 2010

    yes it is i changed the sensor and the thermostat but it still overheats the fans just don't want to kick in. However I know that the fans work because for some reason when you uplug the butterfly wire thing that goes into the sensor the fans kick in for some reason

  • yadayada
    yadayada Jul 05, 2010

    then u have leaking engine cylinder head gaskets or trapped air in the cooling system or most likely both, did u overheat it more than once? if so u need to have the engine torn down and the head gaskets replaced. did u bleed the cooling system of air after u replaced the thermostat? do u have a factory service manual? if u are going to work on this car suggest u see the dealer and oprder a proper repair manual set.

  • acambridge Jul 05, 2010

    the car never really has overheated completely when you drive it its fine but as soon as you leave it idle the temp starts climbng and the fans dont kick in. Also the air compressor doesn't kick in either could that be the problem? I did not bleed the cooling system of air no. It just seems backwards because with the car running if you unplug the butterfly wire thing from the sensor the fans kick in but as soon as you plug it back in the fans quit

  • yadayada
    yadayada Jul 05, 2010

    HAVE THE FANS CHECKED BY THE DEALER. DO THIS BEFORE U FRY THE ENGINE

  • acambridge Jul 05, 2010

    The fans work though I know for a fact they do.

  • yadayada
    yadayada Jul 05, 2010

    OK THEN WHY DOES IT OVEREHEAT??

  • acambridge Jul 05, 2010

    well they don't work when they are supposed to something is not communicating and letting them know to run when the car is hot. thats what's confusing. Because you know the sensor and the plug that goes into it? With the car running when you pull the plug out of the sensor the fans kick in but as soon as you plug it back in the fans quit, almost like its backwards you know?

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  • Chevrolet Master
  • 6,826 Answers

The coolant sensor is bad,change it out,and bleed the air out of the cooling system,the cooling fans should come on on there own,and go off on there own,this is with the ac off.When the cooling fans do this,then it is cooling down correctly.If this was helpful,please rate,by the way,the overheating is most likely from the cooling fans not coming on,this is the reason,thank you,and please rate.

Posted on Jul 04, 2010

Testimonial: "Thanks will give it a try"

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  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 05, 2010

    bleed the air out of the cooling system

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 05, 2010

    You need to bleed the cooling system,the air in the system keeps the coolant from flowing,there fore the sensor can not sense the coolant,the sensor can not sense the air in the pockets,of the cooling system or steam,it has to be coolant,so you see,this is most likely the problem,unpluging the sensor will activate the cooling fans,so yes,this does rule out bad fans,sensor,and relays,just bleed the air out of the system and it will fix the problem.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 05, 2010

    Look,bleed the system,and get the air out,do not go by ,,,head gasket damage,do this first,bleed the air out,I know what I am talking about,get the air out,then look for the fans to come on,and go off on there own,then if they do not,look for other reasons for this,but the reason the cooling fans are not coming on,is the fact the sensor is not reading the hot coolant,this is the reason,no other reason,just this one,when you unpluged the sensor,and the cooling fans came on,this proved the electircal system is working,just bleed it,and go form there ,this will solve the problem.

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