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  • Temp Gauge Problem

    Truck - 1993 C1500 Silverado, 5.7l, 4X2. 64K miles, owned since new.

    Problem - Water temperature gauge quit working a couple of months ago. When starting the truck, the needle pegs to the right then moves far left and that's where it stays no matter how long the engine runs. No temp. reading at all.

    Attempts to fix - 1. Replaced the temperature sending unit. Did not correct problem.

    2. Removed instrument cluster and had tested at a certified rebuild shop. Reinstalled and had the same problem.

    3. Replaced temperature sending unit again. Same problem.

    Can someone please help me? This is driving me crazy. My Haynes manual doesn't offer any help.

    Thanks to all.

  • #2
    Re: Temp Gauge Problem

    it has to be the wiring or connectors going to it.
    O2 GMC RCSB 4.8L V8 AUTO 3.73's
    rebuilt/beefed up 4L60E(at 43,000miles)

    Comment


    • #3
      Re: Temp Gauge Problem

      sounds like the wire going to sending unit is shorted straight to ground.
      2005 1500 CC 2WD
      DynoMax Ultraflo 3.5" Custom Exhaust
      Stock 3.73 G80
      TransGO HD2 Shift Kit/Corvette Servo/Yank TT3000
      Comp Cams 222/224 .566/.568 112LSA
      Pacesetter LT's
      Wheatley Live Tune

      Comment


      • #4
        Re: Temp Gauge Problem

        I checked the wiring at the sending unit with a volt/ohm meter. I have 5.1v, which is spec. Also, the yellow wire is not grounded. Think maybe the connector in the dash that the cluster plugs into is faulty? I don't know anything about how to get behind the panel and correct it if it is the problem.

        Comment


        • #5
          Re: Temp Gauge Problem

          Originally posted by RBrooks
          Truck - 1993 C1500 Silverado, 5.7l, 4X2. 64K miles, owned since new.

          Problem - Water temperature gauge quit working a couple of months ago. When starting the truck, the needle pegs to the right then moves far left and that's where it stays no matter how long the engine runs. No temp. reading at all.
          This is the normal procedure to let you know that the gauge is working.

          You didn't mention whether or not you replaced the thermostat. If it's stuck open, you'll get practically no temp reading, regardless of how you run the truck. The temp gauge won't register at all till you hit 100-110 or so, and if your ambient temp is any less than 110, you won't get your engine to 110 degrees.

          I found this out the hard way when my 'stat stuck open in sub-freezing, rainy/icy weather once... the engine didn't put out enough heat to even noticeably warm the heater. I had to fashion a grill cover to let it warm up enough till I could get to where I could change it.

          Try this: bungee or tape half a flattened cardboard box in front of your radiator and see if the temp gauge comes up. If it does, you'll know your thermostat's bad.

          -blaine

          Comment


          • #6
            Re: Temp Gauge Problem

            wait a minute. are you talking about the sensor or the sending unit. i may be wrong but the gauge is controlled by the sending unit in the driver's side head and it is a single wire.
            2005 1500 CC 2WD
            DynoMax Ultraflo 3.5" Custom Exhaust
            Stock 3.73 G80
            TransGO HD2 Shift Kit/Corvette Servo/Yank TT3000
            Comp Cams 222/224 .566/.568 112LSA
            Pacesetter LT's
            Wheatley Live Tune

            Comment


            • #7
              Re: Temp Gauge Problem

              Thank You to pbraxton. My problem is solved. I wasn't aware of the engine coolant temperature switch on the block. Went to my local parts house and got one for $11.99. Installed it and voila!!! my temp gauge came to life. Since I was already in repair mode, I installed a new thermostat and gaskets, and flushed and filled the coolant. Hopefully, I'm good to go now. It'll be good to park the '03 gas hog (12-14mpg)and enjoy my 20mpg again.

              In checking back in my Haynes, I found the switch listed in the emissions section. It shows a picture, but there is no text concerning it. Lotsa help that is.

              Comment


              • #8
                Re: Temp Gauge Problem

                Originally posted by RBrooks
                Thank You to pbraxton. My problem is solved. I wasn't aware of the engine coolant temperature switch on the block. Went to my local parts house and got one for $11.99. Installed it and voila!!! my temp gauge came to life. Since I was already in repair mode, I installed a new thermostat and gaskets, and flushed and filled the coolant. Hopefully, I'm good to go now. It'll be good to park the '03 gas hog (12-14mpg)and enjoy my 20mpg again.

                In checking back in my Haynes, I found the switch listed in the emissions section. It shows a picture, but there is no text concerning it. Lotsa help that is.
                hey man, no problem, when i first read this thread i didnt even think about that until you said something about voltage, then it hit me.
                2005 1500 CC 2WD
                DynoMax Ultraflo 3.5" Custom Exhaust
                Stock 3.73 G80
                TransGO HD2 Shift Kit/Corvette Servo/Yank TT3000
                Comp Cams 222/224 .566/.568 112LSA
                Pacesetter LT's
                Wheatley Live Tune

                Comment


                • #9
                  Re: Temp Gauge Problem

                  Originally posted by RBrooks
                  Thank You to pbraxton. My problem is solved. I wasn't aware of the engine coolant temperature switch on the block. Went to my local parts house and got one for $11.99. Installed it and voila!!! my temp gauge came to life. Since I was already in repair mode, I installed a new thermostat and gaskets, and flushed and filled the coolant. Hopefully, I'm good to go now. It'll be good to park the '03 gas hog (12-14mpg)and enjoy my 20mpg again.

                  In checking back in my Haynes, I found the switch listed in the emissions section. It shows a picture, but there is no text concerning it. Lotsa help that is.
                  Where on the block is the switch, My truck is doing the same thing. I read this thread yesterday and bought a switch but the only thing I found that looks like it is in the driver side head and only has one wire in it, the switch has two.
                  TIA
                  Last edited by Texas Z71; 10-20-2005, 09:45 PM.

                  Comment


                  • #10
                    Re: Temp Gauge Problem

                    Originally posted by Texas Z71
                    Where on the block is the switch, My truck is doing the same thing. I read this thread yesterday and bought a switch but the only thing I found that looks like it is in the driver side head and only has one wire in it, the switch has two.
                    TIA
                    they gave you the sensor, not the switch.
                    2005 1500 CC 2WD
                    DynoMax Ultraflo 3.5" Custom Exhaust
                    Stock 3.73 G80
                    TransGO HD2 Shift Kit/Corvette Servo/Yank TT3000
                    Comp Cams 222/224 .566/.568 112LSA
                    Pacesetter LT's
                    Wheatley Live Tune

                    Comment


                    • #11
                      Re: Temp Gauge Problem

                      Where is the switch, I guess I will just change both of them

                      Comment


                      • #12
                        Re: Temp Gauge Problem

                        the sender for the gage is on the drivers side head right below the valve cover and between the first cylinders. when mine went out i gout one from orielys that looks like the one in the intake that they said is a replacment for the one wire sensor. it came with a new plug that you spliced the single wire onto one of the new plug wires and ran the other new plug wire to a ground.

                        Comment


                        • #13
                          Re: Temp Gauge Problem

                          Originally posted by The_Ogre25
                          the sender for the gage is on the drivers side head right below the valve cover and between the first cylinders. when mine went out i gout one from orielys that looks like the one in the intake that they said is a replacment for the one wire sensor. it came with a new plug that you spliced the single wire onto one of the new plug wires and ran the other new plug wire to a ground.
                          autozone sells the single wire switch. just make sure that is what they lookup. they have both listed differently in the computer. you shouldn't have to cut or wire anything. re-read this thread!
                          2005 1500 CC 2WD
                          DynoMax Ultraflo 3.5" Custom Exhaust
                          Stock 3.73 G80
                          TransGO HD2 Shift Kit/Corvette Servo/Yank TT3000
                          Comp Cams 222/224 .566/.568 112LSA
                          Pacesetter LT's
                          Wheatley Live Tune

                          Comment


                          • #14
                            Re: Temp Gauge Problem

                            where did you run the ground to

                            Comment


                            • #15
                              Re: Temp Gauge Problem

                              Originally posted by Texas Z71
                              where did you run the ground to
                              i wouldnt do it that way! besides if you do have the sensor and not the 2 wire switch, the ohmic values may be different and your temp guage will be inaccurate.
                              2005 1500 CC 2WD
                              DynoMax Ultraflo 3.5" Custom Exhaust
                              Stock 3.73 G80
                              TransGO HD2 Shift Kit/Corvette Servo/Yank TT3000
                              Comp Cams 222/224 .566/.568 112LSA
                              Pacesetter LT's
                              Wheatley Live Tune

                              Comment

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