Radiator Fans always on
#1
Thread Starter
Radiator Fans always on
As per the title, recently my radiator fans are both on constantly, even when the engine is cold.
The fans do switch off when the ignition is off, but if you turn it on, without starting the car, both fans switch on at full whack.
I've swapped both relays from another S (cooling fan and AC cooling fan) and this didn't resolve the issue, so I don't think it's relays.
I've tried reaching down to ensure the fan switch is connected correctly, and it all feels ok.
Engine temps are otherwise all fine, and show as expected on the dash.
I've tried following the wires from the fanswitch in the rad, and it goes up into the loom attached to the wing. From there, there is an earth with a bunch of wires attached. Is it worth taking this off and giving it a clean?
Could it be the fan switch that's gone, or the thermostat? If it is the switch, would the mishomoto one (£25) fit, or would the Mugen one be a better replacement? Both seem to have a lower switch on rate. I presume the cooling system needs to be drained to replace this? https://www.s2ki.com/s2000/topic/107...9#entry1392289 ?
Any other ideas?
I've recently had to put in a new Yuasa battery as the other one wouldn't take a full charge (or at least, the 'eye' never went green) so don't want the new battery getting extra drain.
Cheers
The fans do switch off when the ignition is off, but if you turn it on, without starting the car, both fans switch on at full whack.
I've swapped both relays from another S (cooling fan and AC cooling fan) and this didn't resolve the issue, so I don't think it's relays.
I've tried reaching down to ensure the fan switch is connected correctly, and it all feels ok.
Engine temps are otherwise all fine, and show as expected on the dash.
I've tried following the wires from the fanswitch in the rad, and it goes up into the loom attached to the wing. From there, there is an earth with a bunch of wires attached. Is it worth taking this off and giving it a clean?
Could it be the fan switch that's gone, or the thermostat? If it is the switch, would the mishomoto one (£25) fit, or would the Mugen one be a better replacement? Both seem to have a lower switch on rate. I presume the cooling system needs to be drained to replace this? https://www.s2ki.com/s2000/topic/107...9#entry1392289 ?
Any other ideas?
I've recently had to put in a new Yuasa battery as the other one wouldn't take a full charge (or at least, the 'eye' never went green) so don't want the new battery getting extra drain.
Cheers
#2
Mine was recently doing the same because a dodgy fan switch. i diagnosed mine by unplugging it. The fans then stayed off when putting the ignition was on. Told me that the switch was activating below the temperature threshold.
Fitting a new one did however mean draining the coolant. If you do it be really carful to bleed the system completely of air when refilling.
Fitting a new one did however mean draining the coolant. If you do it be really carful to bleed the system completely of air when refilling.
Thread
Thread Starter
Forum
Replies
Last Post