Thermo fans....help!

[rhyno]

The fan controller can be had for about $36 delivered [ebay]130585665559[/ebay]

Thanks for the link. I'll go through the diagnosis first to make sure it isn't the coolant sensor, before I buy any more parts that I don't need...Much better price though,thanks.

[Shadow_Rusty]

I got my info from FAN PROBLEM - POLL SYNOPSIS - uk-mkivs
And I made this diagram to help some people there understand it a little better...

Each fan has a completely seperate pair of circuits...
They have a 3pin connector. Ground / Low Speed Power / High Speed Power
So it's 1 resistor per fan as both fans have a low speed circuit.

You don't need to cut anything (I didn't). I cut off a small piece of the insulation, and spliced the wires from the resistor between the "Low Speed Power" (red/white wire) and the "High Speed Power" (red/black wire) with a soldering iron...

Dodgy mspaint circuit diagram... You will need to do this for each fan that doesn't work on low speed...
Black = existing wiring
Red = New Wiring / Resistor
Red Dot = Connection Join (I used a soldering iron, but good quality high current crimp on connectors may work)