Radiator fan stuck on


So turns out the thermostat got stuck, replaced and that's now working, just this radiator fan now.
In the odd situation where the fan comes on before the stat is even open lol
 
Right from the research I've done it's got to be the ecu turning the fan on early. Going to find the fan control pin on the ecu and cut it, see if the fan comes on when the fan switch tells it too and not the ecu. Is this safe to do?
 
Bringing this back,
Fitted new radiator this week and new water temp gauge(old one broke)
Whilst bleeding the coolant I noticed than fan wouldn't come on. I could see the coolant clearly boiling in the rad neck so something not right with this fan setup again.
I'll look into the relay and all fuses today but I'm stumped otherwise.
Thermostat works
Swapped fan switch for spare one
So they are ruled out.
 
I've not tried jumping the wire at the fan switch yet.
I know the fan works because
1. It's brand new spal fan
2. It works when I connect the FANC wire at the ecu

I cut that wire in Jan because it was bringing my fan on at 75c. The FANC wire is more of a fail safe for when the fan switch doesn't work, yet was coming in wayyy to early.
 
Just know you can get a low temperature fan switch but you don't have that do you? I'd get OEM fan switch ,other then that it sure is a strange one ,
 
I've got two. 1 spare I had from an old b18c block I bought for its crankshaft and the stock one that's always been on the engine.
I'll continue investigations and worst case buy another switch if I can't find the problem.
I'm hoping it's the relay but I'm not sure if the FANC wire uses that relay to turn the fan on... If it does then it's not relay because that works, just wayyy to early.
 
It could be possible that the ecu sees nothing from a sensor somewhere and cuts the fan in as protection.
Although I have changed the temp sensors so...
 
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