mgbrs

Can anyone shed any light on why all of a sudden the radiator fan should switch itself on, this then causing the alarm to be triggered, or visa versa, obviously electrical just wondering if there was a common fault. Starts and runs fine, battery has plenty of power, key fob ok, stood overnight ok, then 8.30am all hell breaks loose. Any help would be much appreciated.
CheeRS
Ant.

charlie luciano

iTrader: (3)

I had this on my car mate, its either the fan switch or the relay, check the relay 1st, its the easiest to change on my car relay is a little yellow one in the fuse box, might differ from yours


Luciano

big mac

iTrader: (7)

check the wiring on the o/s/f chassis leg under the turbo as it can melt and cause this problem

cossiewill.

Also it could be the fan wiring shorting out. I had this and when i looked at the fuse box the space for the rad fan fuse was melted.
This was the tread:
https://passionford.com/forum/ford-sierra-sapphire-rs500-cosworth/271986-traking-down-probelm-with-the-fan.html

I got a replacement fan wiring loom and it works great now!!
heres a link to it on ebay if you need one:
http://urlant.com//yvwjmu

tabetha

If you are running a std wiring set up for the fan, it needs ditching now anyway.
They were substandard when new, I would make up a little circuit, take about an hour or so, cost less than £10, easy to do.
It sounds like a relay is being a bit sensitive, and turning on when not energised(switched on), just tap the fan relay next time and it will stop if this is the case, but a rewire is defo the best bet anyway.
tabetha