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Thread: Radiator fan switch question

  1. #11
    Join Date
    Nov 2010
    Location
    New Jersey
    Posts
    232

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    I replaced that switch with this inline unit in the top hose. Main benefit is that it’s adjustable for temperature.

    https://www.revotec.com/acatalog/Ele...e-Fitting.html
    1985 Caterham Super Seven
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  2. #12
    Join Date
    Jan 2020
    Posts
    135

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    I just bought a 180 degree switch from Pegasus https://www.pegasusautoracing.com/pr...sp?RecID=10284 with a M22 adapter so it can replace the original https://www.pegasusautoracing.com/pr...sp?RecID=28243
    1987 Caterham 1700 Supersprint
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  3. #13
    Join Date
    Feb 2012
    Location
    Roswell GA
    Posts
    1,004

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    The Pegasus set-up looks good. I will need to see if my car has a fan relay or if the switch directly controls the 15A fan circuit.

    Thanks Anker
    Life happens while you're making other plans
    1995 Caterham Crossflow RHD
    1990 Miata
    2007 GMC Sierra WT
    2013 Mini (Her's)
    2014 Outback
    JOHN DEERE D130

  4. #14
    Join Date
    Feb 2012
    Location
    Roswell GA
    Posts
    1,004

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    It's not a 3 minute egg but I've been boiling parts. The radiator fan switch closes around 190F. The switch has four number groupings stamped on the flat surface. One of the numbers is 92, I would guess that is for 92C.
    I did a side by side test with the installed thermostat and the new out of the box 180F unit. The new part opened around 182F and the old one around 185F and did not open as much as the new unit.
    So, in with the new and figure out a manual override to be over cautious.
    Life happens while you're making other plans
    1995 Caterham Crossflow RHD
    1990 Miata
    2007 GMC Sierra WT
    2013 Mini (Her's)
    2014 Outback
    JOHN DEERE D130

  5. #15
    Join Date
    May 2010
    Location
    Laurel MD
    Posts
    185

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    Don't forget the actual temperature at the sensor will depend where the sensor is located. On my engine the ECU temp sensor is in the back of the cylinder head. The fan sensor is in the return line to the top of the radiator, there is often a 15 degree difference.

    Graham

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