Okay, there is two types of manual switch.
Overide. For cars with a normal working fan, but the driver wants to switch on from cabin also. So there is still ECU signal wires in loom.Track day types use it sometimes.
And just a manual switch, my car. If I removed fan, relay, wiring and battery and bolted to a steel table, fan will still work. Don't require the ECU. Relays are there to handle the power only.
I think a regular relay should fit in your car someplace.
Start a wiring topic here. I did three years back, lots of advice.
Citroen C3 cooling fan issue
-
- Posts: 9
- Joined: 09 Jul 2024, 12:09
Re: Citroen C3 cooling fan issue
ooo yes . nothing. no classics 4/5 pins relay.seanrx wrote: 18 Jul 2024, 19:10 Really?
So nothing in your fan wiring that's a sealed round/square plastic box with 4/5 flat pins sticking out downwards?
i traced 4 smaller pins from resistor, 3 wires are going to ECU, and one is splitting towards ECU and BSI. they are all good for resistance.
-
- Donor 2024
- Posts: 168
- Joined: 02 Feb 2017, 13:11
- x 6
Re: Citroen C3 cooling fan issue
Then you may have to manual switch as in my car. Depends how much you want to spend to find the ECU fault.
You write that fan does run with a d.c applied. That's a start.
My old fan did not.
The new fan did of course but was still no signal from the ECU. Pah! So I had to butcher £120 of new item for a manual switch.
Lots of diagrams online, easiest is using one wire to switch, like mine.
And a new battery pos clamp, a type that can accept other wires bolted onto it. From Halfords.
You write that fan does run with a d.c applied. That's a start.
My old fan did not.
The new fan did of course but was still no signal from the ECU. Pah! So I had to butcher £120 of new item for a manual switch.
Lots of diagrams online, easiest is using one wire to switch, like mine.
And a new battery pos clamp, a type that can accept other wires bolted onto it. From Halfords.