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Fan turning on when battery connected
Posted: 13 Mar 2022, 13:56
by jamesling
Hi all,
Had my van standing for a while and now when I reconnect my battery, the fan instantly goes on and doesn't seem to want to shut off.
Blown fuse?
Cheers,
James
Re: Fan turning on when battery connected
Posted: 13 Mar 2022, 13:57
by davidoft1
Faulty fan switch or sticky relay
Re: Fan turning on when battery connected
Posted: 13 Mar 2022, 13:59
by R0B
It wouldn't work at all if it was a blown fuse.
Re: Fan turning on when battery connected
Posted: 13 Mar 2022, 14:47
by Oldiebut goodie
Rats or mice chewing wiring?
Re: Fan turning on when battery connected
Posted: 13 Mar 2022, 15:55
by TONYT25T25
I would check the wiring at the radiator for corroded wires making a cross connection.
Re: Fan turning on when battery connected
Posted: 13 Mar 2022, 16:31
by RogerT
Radiator fan or heater blower? Just to clarify…
Re: Fan turning on when battery connected
Posted: 14 Mar 2022, 08:16
by Robsey
I think it would probably be the "X" or relief relay sticking closed.
On the early vans, probably numbered 18 or 24 on the top.
If the rad fan - consider a faulty thermal switch or damaged wiring too.
Re: Fan turning on when battery connected
Posted: 14 Mar 2022, 08:28
by cobblers
If rad fan, pull the plug off the fan switch and if the fan stops, the switch is your problem.
Re: Fan turning on when battery connected
Posted: 15 Mar 2022, 01:50
by Robsey
cobblers wrote: ↑14 Mar 2022, 08:28
If rad fan, pull the plug off the fan switch and if the fan stops, the switch is your problem.
Why didn't I think of that.?
So there are your options.
Unplug the fan switch.
Or
Unplug the Relief Relay.
And then look for damaged wiring, earth connectors.
It isn't one of those crazy causes, like the high beam switch is on?
I have heard of that somewhere before...