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Radiator Fan Switch

Engine/Gearbox questions and discussion
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4thgenphil
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Post by 4thgenphil » Wed Aug 22, 2018 7:01 pm

Ok, weird one but if you up plug the temp sensor on a prelude on a prelude the fan comes on. Does your temp gauge work?
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NafemanNathan
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Post by NafemanNathan » Wed Aug 22, 2018 8:27 pm

Wouldn't that be the same as just unplugging the thermoswitch? Not sure I follow.

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Post by 4thgenphil » Wed Aug 22, 2018 11:04 pm

NafemanNathan wrote:Wouldn't that be the same as just unplugging the thermoswitch? Not sure I follow.
If you unplug the sensor for the temp sensor for the gauge it kicks the fan on, not unplugging the the fan switch
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Post by Vtecmec » Thu Aug 23, 2018 9:50 am

If you unplug it and bridge the connector, the fan kicks in. So if you unplug it and it stays on then its the wiring, otherwise it's the switch.

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Post by prelude_h22 » Wed Aug 29, 2018 9:42 pm

Just an update to this thread.

I purchased the Cambiare thermo rad switch. (the one in the ebay link)
The install was straight forward, the under trays were abit fiddly to remove and a couple of the clips broke

Once the under tray was removed the rad switch was easily accessible.

Before removing the thermo switch I disconnected the connector from the old rad switch and connected it to the new switch.
I turned the car to pre ignition and the fans stayed off which confirmed the diagnosis. (the old rad switch was stuck in the closed position)


You will need a 24mm deep socket to loosen and tighten the thermo switch.
I only realised this last minute so popped into my local halfords to get one. (note: deep socket is a 1/2 inch drive)
https://www.halfords.com/workshop-tools ... -1-2-drive

Removed the old and installed new, coolant leaked out for a second or two but wasnt too bad.
Started her up and ran the engine for around 10 mins or so. 
Fans kicked in as normal :)
No bleeding was required.

Thanks for your help guys
Amazing savings over Genuine Honda part, hope this one lasts.

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Post by NafemanNathan » Wed Aug 29, 2018 11:10 pm

Glad you're sorted bud :)

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