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What turns fans on?

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  • What turns fans on?

    Guys, what tells my fans to come on?

    I have been using my SLP fan switch to keep the car cool, hate knowing that if I forgot it could overheat.

    Temp gauge works perfect.

    Any ideas?
    1998 Chevrolet Camaro Z28 - 6 Speed

  • #2
    PCM via ECT sender.
    sigpic
    Turbo Charged LS1/T56

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    • #3
      Yupp. You can change when they come on. I have TunerCats I could do it for you.
      Originally posted by Yoshi94
      Mines about an inch bigger than Kyles. I need to get one of those
      Originally posted by ryanwarby01
      Put it this way, if you have a money tree a LT1 is a wood chipper!
      sigpic

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      • #4
        When I had my car tuned I had them bring it down but the sensor must be broken because it will go to 240+ and do nothing. Scares the hell out of me when I see it that high. Car usually runs at the second mark. 180?
        1998 Chevrolet Camaro Z28 - 6 Speed

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        • #5
          One thing to remember, the accuracy of the temp guages in 4th gens is very suspect.
          When in doubt, Whip it out !

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          • #6
            Hook up a tuner or a scanner to see the read temps.
            Originally posted by Yoshi94
            Mines about an inch bigger than Kyles. I need to get one of those
            Originally posted by ryanwarby01
            Put it this way, if you have a money tree a LT1 is a wood chipper!
            sigpic

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            • #7
              according to my live OBDII scanner my gauge is pretty damn close.
              1998 Chevrolet Camaro Z28 - 6 Speed

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              • #8
                There are 2 sensors on an Lt1. 1 on the front of the water pump 2 wires. This one controls the signal to the PCM to turn the fans on and off. 2 is on the drivers side of the block and has 1 wire this one sends signal to temp gauge. The PCM can be programed in concert with the thermostate 160* to turn on the fans.

                Nate keep in mind though that the slp fan switch unit may have crippled the signals to the PCM. shbox.com has wire diagram for signals and where to tap in for manual switch. This should help you.
                sigpic
                1998 Trans Am Convertible A4 - WS6 hood, WS6 air lid, WS6 rims, drilled/slotted rotors.

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                • #9
                  Originally posted by Plum Nuts View Post
                  There are 2 sensors on an Lt1. 1 on the front of the water pump 2 wires. This one controls the signal to the PCM to turn the fans on and off. 2 is on the drivers side of the block and has 1 wire this one sends signal to temp gauge. The PCM can be programed in concert with the thermostate 160* to turn on the fans.

                  Nate keep in mind though that the slp fan switch unit may have crippled the signals to the PCM. shbox.com has wire diagram for signals and where to tap in for manual switch. This should help you.

                  my fan switch is plug and play.

                  Ill check the front of the water pump.
                  1998 Chevrolet Camaro Z28 - 6 Speed

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                  • #10
                    Fan switches are evil
                    sigpic
                    Turbo Charged LS1/T56

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                    • #11
                      You can get an fan controller from Summit that is adjustable.

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                      • #12
                        Yeah depending on how the fan switch was tapped, it might be overriding the PCM's signal. I have a 160* thermostat and Steve put it in the tune. My temperature gauge never goes above 180.
                        - Brian Meissen
                        Owner, MiFBody.com
                        Administrator, LTxTech.com


                        1994 Camaro LT1 Transplant - 357ci LT1, cammed, stalled, and driven.
                        2022 Camaro LT1 - "Cherry Bomb 2"
                        Michigan FBody Meet & Greet Car Show 2022
                        June 4th, 2022 - 9am to 3pm!!!
                        The HUB Stadium, Auburn Hills, MI

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                        • #13
                          ive wired fans to a toggle switch and have had to wire my fans so when the keys are on the fans are on.

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