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1998 pontiac grand prix 3800 s/c

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here 1998 pontiac grand prix 3800 s/c

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  • #493852
    chrischris
    Participant

      Just changed my temp sensor now my cooling fans won’t work not even when I turn my a/c on but when I unplug my sensor they come on what would cause this

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    • #493899
      college mancollege man
      Moderator

        You could have air in the cooling system from changing the
        cts or a bad sensor out of the box.check that your coolant
        level is full and free of air. also check that it is the correct
        sensor.is there a check engine light on? if so post codes.
        does the car run at normal temp?

        #493971
        VenturiVenturi
        Participant

          What do you mean when you said they will not come on? I would find out the temperature they’re supposed to come on, then test that out. I have a 2002 Pontiac Grand Prix. I got it in the fall so I haven’t had a chance to see if the cooling fans work. But I did try the A/C, and the fans did not come on in the minute or so that I let the A/C run, So I don’t know if they always will.

          #494084
          chrischris
          Participant

            I figured it out the plug that goes to the temp sensor was old and the wires were loose… but now I have a cylinder 1 misfire and injector 6 open circuit I know it prob needs a tune up but what could the open circuit be?

            #494085
            VenturiVenturi
            Participant

              If an injector has an open circuit, the solenoid either has a fault, or the connector/wires came off. Check to make sure that injector 6 is plugged in, and that the wires are in good shape. They are thin wires so don’t bend them much.
              Here’s a picture of the wires/connector from when I did my valve cover gaskets:

              #495608
              EricTheCarGuy 1EricTheCarGuy
              Keymaster

                Glad you got the coolant temp sensor sorted out. As for the misfire you’re probably on the right path by starting with a tune up. To answer your question an ‘open circuit’ is like something is unplugged or dead. You may want to check and see if the plug for cylinder #6 is unplugged or if there is damage to the wires. In fact I would check all the wires just to be on the safe side.

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