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Cooling fan wont come on...

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    #16
    I've got a brand new Cooling Fan Sensor, the fans worked directly on a 12 volt source. Does the ECM control any of this turning on or only the Cooling Fan Sensor.

    Additionally another odd thing I noticed today, my ac compressor comes on no matter what with the A/C button in or not...still turns it on.

    Very interesting. -

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      #17
      Originally posted by fusioncom
      I've got a brand new Cooling Fan Sensor, the fans worked directly on a 12 volt source. Does the ECM control any of this turning on or only the Cooling Fan Sensor.

      Additionally another odd thing I noticed today, my ac compressor comes on no matter what with the A/C button in or not...still turns it on.

      Very interesting. -
      The pully will spin at all times, but the compressor clutch itself will not engage unless the AC is on.
      Originally posted by sweet91accord
      if aredy time i need to put something in cb7tuner. you guy need to me a smart ass about and bust on my spelling,gramar and shit like that in so sorry.

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        #18
        Originally posted by NAiL05
        1. Check your wiring.
        2. Make sure the fan switch that detects temp on the head is functioning properly.
        3. Make sure fan is plugged in.
        4. If those check out you might be the lucky winner of two crapped out fan motors which is something I have never seen before.

        Your radiator hoses are supposed to be about equal temp and stiffness if the T-stat opens up.
        I've seen 2 crapped out fan motors before . . . Customer went mental at us because we couldn't diagnose the problem - Murphys law, as soon as she picked the car up it started makng the noise - Faulty fan motors.
        You'd think they would have noticed the car overheating rather than the faint and intermittent noise

        You havn't said yet - but have you checked the fuses and relays?


        Car Safety / General Servicing Checks --------Basic suspension checks

        My 5.7 LS1 Holden Ute

        A "Finished" project car is never finished until its been sold.

        If at first you don't succeed, Try again. Don't give up too easily, persistance pays off in the end.

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          #19
          All relays under the hood pertaining to fan operation have been replaced, cooling fan sensor, relay. Circuit has been test using jumpers to verify the fan works, and the circuit isnt shorted etc.
          One thing we noticed during testing today was, after the sensor trips for some reason instead of getting voltage at the underhood fuse box, we actually loose a voltage source.
          Looking at the wiring diagram it looks like the operations of the unit are still running through the fan timer unit, even the radiator fan.
          I noticed in the past if the car was hot, and or overheating the condensor fan would come on when the car was off. Now today even though the car was overheating, that fan wouldnt come on with the AC on, or on when the car was turned off.

          All that being said, I'm going to try and replace the fan timer unit and see if that helps.

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