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Thread: Thermo fans not running anymore?

  1. #1
    Shirley Guest

    Thermo fans not running anymore?

    One thing ya gotta say about Range Rover.
    They keep ya thinking, hey?
    It's got to the point where I'm weraing a spot in the scalp, not a good look!
    The rotten fans are no longer working......
    Has anyone got any idea where exactly these rotters draw their power??
    Please don't say the BECM!
    I replaced Relay / Fuse box and lost the thermo fans soon after???
    Some direction might just save a lot of stress...

    Thanks fellas.

    Shirley.

  2. #2
    p38arover's Avatar
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    Probably the binary (dual pressure) switch in the airconditioning (behind the bumper LHS).

    In 10 years of ownership, I've only heard my fans come on about twice.
    Ron B.
    VK2OTC

    2003 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  3. #3
    Shirley Guest
    Hi Ron,
    I was thinking along those lines but couldn't quite see where the switch was located.
    In most cars there is another switch on the top of the receiver / dryer but I can't find that either, at least not yet.
    The A/C works quite good now sice replacing the Fuse box and LH Blend motor but the lack of thermo fans has a tendency to loose efficiancy when in heavy traffic.
    Thanks for the info, I will check it out in the morning.

    Cheers,
    Shirley. (96 P38A - 2000 D2 )

  4. #4
    p38arover's Avatar
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    The receiver/drier is below/behind the LH bumper. If you check the ETM you'll see a description of how/when the fans switch on and how they switch from series to parallel connection (half-speed/full speed).

    If you pull the connector off the switch and bridge the terminals in the connector, the fans should come on.

    I could have sworn I'd posted about this (with pics) recently. I can't find it.
    Ron B.
    VK2OTC

    2003 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  5. #5
    Shirley Guest
    No worries Ron,
    Got the idea of it.....
    Just couldn't find the terminals up until now. I was beginning to wonder if Landrover had broken the rules of AC and done something totally new to science..
    _____.
    Shirley.

  6. #6
    p38arover's Avatar
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    From the ETM:

    Pressure switch 1 (Trinary switch)
    This switch is in parallel with two components, the
    condensor fans and the compressor clutch which are
    both normally short circuit. If the pressure is too high
    or too low, the switch will open and cut the feed to
    the clutch to prevent damage to the system. With the
    third setting, at a specific pressure the switch is
    shorted and changes the condenser fan mode from
    series to parallel.

    Pressure switch 2 (Single switch)
    The switch is normally open circuit. At a specific
    pressure, the switch is shorted and allows the
    condenser fans to turn on.
    Attached Images Attached Images
    Ron B.
    VK2OTC

    2003 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  7. #7
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    Quote Originally Posted by Shirldownunder View Post
    One thing ya gotta say about Range Rover.
    They keep ya thinking, hey?
    It's got to the point where I'm weraing a spot in the scalp, not a good look!
    The rotten fans are no longer working......
    Has anyone got any idea where exactly these rotters draw their power??
    Please don't say the BECM!
    I replaced Relay / Fuse box and lost the thermo fans soon after???
    Some direction might just save a lot of stress...

    Thanks fellas.

    Shirley.
    The thermo fans should only be working when the AC is on and it is roughly a 40C day.
    I guess there is a coolant temp trigger point i would say it is in the region of 105C.
    In 12 years of having my P38 i have only seen my fans on a few times.
    If they are not cutting in your cooling system is A1 as far as im concerned.

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