billinjah 0 Posted July 7, 2006 just a quick one ive fitted a kenlowe fan i want it to spin as fast as possible the original fans have 2 speeds am i right :roll: ? how would i get the kenlowe to spin on the fastest setting ive tried both the positive terminals and it spins the same on both which is fast enough to easily manage the engine temps but just in case id like it a bit faster, do i need to use both positives at the same time? dont want to blow my expensive fan up ya see! :D Quote Share this post Link to post Share on other sites
bcstudent 0 Posted July 8, 2006 The series resistance for the low-speed fan setting appears to be part of the original fan motor. I'd suggest using the red/white live as it's switched by the lower of the two temperature switches at 95 degrees; it's also linked to the fuel pump/radiator fan 'after run' control unit. The red/black live is switched at 102 degrees. Quote Share this post Link to post Share on other sites
Henny 0 Posted July 10, 2006 bcstudent, is right, the original fan has 2 inputs for 12V. It then adds in the extra resistance to one of the terminals to make the fan slower. The car wiring doesn't do anything other than provide switched 12V at 2 different temperatures. 8) The best way to do what you want to do (and the way I've run my aftermarket fan for the last 2 years) is to wire BOTH the low speed and hi speed +12V to the positive of the fan and the earth straight back to the battery. This way, if your fan switch ever fails on the low speed side, you'll not totally cook your engine as it'll kick in on the higher setting. It also means that the fan-run-on will still work (it's done via the low speed wiring). Quote Share this post Link to post Share on other sites
g60pops 0 Posted September 6, 2006 Henny, why would you need to connect the earth straight back to the battery and not just to the normal earth wire? Quote Share this post Link to post Share on other sites
mattkh 0 Posted October 1, 2006 The series resistance for the low-speed fan setting appears to be part of the original fan motor. I'd suggest using the red/white live as it's switched by the lower of the two temperature switches at 95 degrees; it's also linked to the fuel pump/radiator fan 'after run' control unit. The red/black live is switched at 102 degrees. Hi Where do I find this control unit on 1.8 16v 1991 ? Quote Share this post Link to post Share on other sites
