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Condenser fan not working

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  • Condenser fan not working

    I've recently converted my AC to R134 and its working great other than the fact that my condenser fan will not come on. The radiator fan comes on with the AC but in this Texas heat I need both fans. I have a new fan that I hot wired before installing so i know its good. I swapped the relay with the AC clutch and that is good. I have 13 volts on 1 pin and a fluctuating 15 to 25 ohm ground on the other. That doesn't seem to be a good ground to me. I believe it should be less than 1 ohm ideally. I honestly don't understand the wiring enough to troubleshoot any further. I have been staring at the Helms wiring diagram for days trying to make sense of this. I believe when you turn on the AC, the ECU should supply the ground right? If so, 15 to 25 ohms of ground isn't enough right? The manual just shows the condenser fan ground going to a joint connector and doesn't detail its path any further. Any help would be appreciated. The AC is blowing cold when cruising down the road. I don't know what else to do other than re wire the fan to the rear defroster switch since i had to scrape that off and it doesn't work anyway.

  • #2
    Pretty sure I found the issue. I pulled the harness off of the fan timer and jumped 12v to the wire going to the relay. Fan came on. So I pulled the fan timer out and checked the board to find a blown diode. I found a new one on eBay but I
    https://flic.kr/p/2gf46gj

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    • #3
      Fixed it. Replaced the diode on the circuit board and both fans are working now.

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      • #4
        Thanks for sharing your experience jobysw. What image were you trying to post there?
        NEIL B. - 1991 DA945. Owner since 1997.
        ANYONE CAN BUY A NEW CAR. IT TAKES A TRUE ENTHUSIAST TO BREATHE LIFE INTO AN OLDER ONE.

        SUPPORT G2IC BY VISITING THE G2IC STORE TO GET OFFICIAL G2IC CLOTHING AND DECALS

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        • #5
          I am having the same issue. where is the fan timer?

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          • #6
            I am having the same issue. Can you show or tell us where the fan timer is? thanks man

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