Originally Posted by
muffster
Got a new fan switch on order and will get a loom from MSD, just annoyed that I cant suss out whats wrong with it and why its stopped working.
It sounds like the relay may be jammed or faulty (it's yellow) the switch isn't the problem, although an 'uprated' one will help.
Originally Posted by
Old ford
mine has never come on since i bought it 2 years ago, its on a separate switch for some reason, as I don't know anything about engines I have never bothered to find out why they don't come on on their own but would prefer them to, I had it in for the mot the other day and was stood watching them do it and they had left the car running the next thing there is steam coming out from the bonnet like a kettle boiling!
This highlights why this is a bad idea, it's usually a bodge done by someone as they do not understand what they are doing, some even try and power the fans via the switch!
Basically, the fans stay on for too long, which is what causes the fuse to melt, this is caused by the vast span of the switch. Therefore, the resolution is to rewire, that way you are safe in the knowledge you have new wiring and another advantage is the the fans have an independent supply to that of the rest of the system (which is overloaded).
This along with the fuel pump wiring are two common problems.
Martin