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Thread: Electric Cooling Fan Sensor Placement

  1. 8th February 2021, 02:28 PM #1
    101RRS's Avatar
    101RRS
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    Electric Cooling Fan Sensor Placement

    I am putting a "sucker" 16" electric radiator fan into the fan shroud in my 101 (so not against the radiator but in about the same position where the mechanical fan would have been). As an extra cooling aid I am putting two 10" fans on the grill side of the radiator to push extra air through for those slow climbs when offroad in summer. I cannot use larger fans here as the engine oil cooler is in the way.

    I have a Davis Craig controller to manage these. Now the sensor can be installed in one of two ways - the first it is just pushed between some of the radiator cooling fins just under the the top radiator hose inlet. The second is to cut the top radiator hose and insert an adaptor in there so the sensor directly reads the coolant coming from the engine.

    As I already have a Waterwatch low water sensor already in the top radiator hose I am not keen on putting a second adaptor in the top hose. I have not previous heard of the sensor just being pushed in between radiator fins.

    So has anyone got experience putting the sensor in the radiator fins and how good does it work.

    Thanks

    Garry
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  2. 8th February 2021, 03:42 PM #2
    PhilipA
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    I don't know about radiators but that is how your aircon thermostat works.
    I would think it would work OK as long as you blanked off the airflow in front of it.
    I have fitted a dry sensor next to the wet temperature sensor on the outlet to the radiator on my D2 TD5 . I found in cold weather that it read below the wet sensor so I encased it in the highly technical term "Blu Tack"
    It now reads within 0.5C to the wet ECU temperature.
    So come to think of it that is probably a good place.
    I have a cheap $25 Ebay LED temperature gauge but a switch control would work just as well.
    I just squeezed an eye electrical terminal over the dry sensor to be an interference fit and bolted it to a mounting bolt for the ECU sensor fitting and hose stub, then pressed a blob of Blu Tack over it.
    Regards PhilipA
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  3. 9th February 2021, 10:12 AM #3
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    101RRS
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    Thanks Phil.

    I will try the sensor in the radiator fins and see how it goes - I can always move it to the radiator hose if needed.

    Cheers

    Garry
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
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  4. 10th February 2021, 04:54 AM #4
    Meccles
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    My hayden controller the probe went between radiator fins it works fine
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  5. 10th February 2021, 06:41 PM #5
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    Blknight.aus
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    works fine, I've got mine on the discharge side of the radiator and set to the thermostat opening temp.
    Dave

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  6. 10th March 2021, 01:45 AM #6
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    LOVEMYRANGIE
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    Assuming the 3.5 uses the same pattern thermostat outlet, the 3.9 has a sensor in the thermostat outlet that switches on the condenser fans for the A/C in the RRC's when they get too hot.
    I ditched my viscous unit, shroud and the stock condenser fans and made an ally shroud/fan mount out of checkerplate and bolted two SPAL 12" high volume pullers.
    The fans were wired up to the original condenser fan wiring and I changed the switch to a 90-85C with an 83C thermostat. Works well as it comes on with the A/C as it should and the sensor switches them in based on the wet temperature plus I have a manual dash switch as well so I can run manually if needed.

    Pulls way more air than the viscous ever did and all with only two fans.

    Thermostat housing number is ETC6135, the sensor I just got trawling thru a tridon catalogue, the thread on it is M20.

    Might be an option?
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