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Thread: Radiator fan switch question

  1. #1
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    Default Radiator fan switch question

    I could use some help identifying the radiator fan switch on my 1600 crossflow. Last time out the water temp was above what it should be. Coolant level was good.
    Suggested vendor?

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    Thanks y'all
    Last edited by coffee break; 06-18-2020 at 11:53 AM.
    Life happens while you're making other plans
    1995 Caterham Crossflow RHD
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  2. #2
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    I don't believe the sensor is the problem. The real problem is the piddly fan that I had on my crossflow before replacing it with a modern one. It was behind the radiator, small diameter and a huge gap between the fan and the radiator. It was pretty useless at pulling air through the radiator with the car sitting still. My new fan sits in front of the radiator, has a shroud that prevents the air from leaking sideways around the radiator, had a bigger diameter, but uses the same relay to turn on and off. It turns on a little under 200 degrees and turns off when the temperature falls to about 185. Works like a charm.
    1987 Caterham 1700 Supersprint
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  3. #3
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    Default

    Quote Originally Posted by coffee break View Post
    I could use some help identifying the radiator fan switch on my 1600 crossflow. Last time out the water temp was above what it should be. Coolant level was good.
    Suggested vendor?

    Name:  IMG_2359.jpg
Views: 138
Size:  54.4 KB
    Thanks y'all
    Start with these guys and see if they can lead you down the right path.

    http://www.autoteccomponents.com/radiator-fan-switches
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  4. #4
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    Feb 2012
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    Default

    In the past the fan has keeped the coolant temp at 85c. I jumped the wires that go to the switch and the fan came on. I guess I'll boil the switch and see what the multimeter tells me.
    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. #5
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    Default

    I confirmed the function of the fan switch. It closes around 190F. I picked up two new thermostats to replace the existing one. The suggested one is a 180F and the alternate is 160F. Any down sides to going with the lower temp part?
    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

  6. #6
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    Jan 2020
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    Default

    Where do you get the fan switches. Mine is also 190 degrees, and that's too high. I don't mind purchasing both a 180 and a 160 degree. I suspect 180 is fine.

    Anker
    1987 Caterham 1700 Supersprint
    2002 Porsche Boxster
    2004 Porsche Boxster S
    1941 Dodge Luxury Liner
    2009 Mercedes CLK 350 Cabriolet
    2017 Chevrolet Volt

  7. #7
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    Laurel MD
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    Never seen a 160, pegasus racing dot CV k thg hff e high quality Setrab brand

    https://www.pegasusautoracing.com/gr...D=SETRABSWITCH

  8. #8
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    Default

    160F seems awfully low. If working correctly, that would keep the temps in the 150s or possibly lower. The 180F (82C) seems like a much better choice. If you are still having issues after that, Anker has good advice. All fans aren't created equal (current draw is a decent proxy for effectiveness) and keeping minimal clearance between fan and rad core (+ shroud) increases efficiency. Are your temp issues just in traffic, or are you also having high temps at speed? If the latter, make sure you have shrouding that ensures the air entering the nosecone is actually funneled through the radiator rather than around it.

    -John
    '95 Westfield SEiW w/2.0L Duratec
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  9. #9
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    I removed the existing thermostat and it is marked "180". I think I will install the new one of the same value.
    The fan switch is a puzzle, not much on the markings. The OD of the thread is .859" and the thread gauge that fits it best is 18 TPI. The threads are not tapered as pipe threads are.
    I'm thinking about adding an override switch I can use to turn on the fan if the elevated temps reoccur.
    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

  10. #10
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    Default

    I'd say it's metric given M22 is nearly that size (0.866"), but that thread pitch is really fine for something that big. I've found this page helpful in the past when trying to figure if something is BSP, NPS, or Metric: https://trimantec.com/blogs/t/thread...fication-guide

    -John
    '95 Westfield SEiW w/2.0L Duratec
    '68 Lotus Elan FHC
    '91 Miata w/Flyin Miata suspension & brakes
    '95 Porsche 993 C2
    '86 Porsche 944 turbo (neglected project car)
    Throttle Steer

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