Rad Fans Aren't Working

[bigcheez2k3]

Was sat in traffic today, temp got up to around 95-97 and I don't think the fans came on. I've done a search and read a few threads where Cully has said that they might be ECU controlled...big issue there for me.

Mine was a HDI, now XUD so obviously there isn't an ECU anymore. What can I do?

I know as a last resort I can just wire them up to a switch, but preferably I'd like them to come on automatically like they should.

[Piggy]

should be a rad switch...

this should bridge or break the connection...

you could then simply wire that in to the relays on the fans??