John_205_GTi 0 Posted May 2, 2007 From the radiator thermoswitch comes 3 wires (58j,57b,58c), these go to a plug, what does the plug go onto? Share this post Link to post Share on other sites
Richie-Van-GTi 71 2 Cars Posted May 2, 2007 there should be a plug in the radiator itself which is the actual switch that runs round to the fans and the fans are wired to the relay fastened to the top of the rad normally and that then runs to the fuse board. Share this post Link to post Share on other sites
John_205_GTi 0 Posted May 2, 2007 Not sure, there are 6 wires coming out of the thermo switch, 3 of wich go to the fan etc and another 3 which go to this plug which isn't connected to anything? Share this post Link to post Share on other sites
Super Josh 4 Posted May 2, 2007 That description is a little misleading, as the standard GTi only has one fan. The 3 wires are as follows.... 57b is a 12V feed that comes from the little distribution block on the slam panel. 58c is the high speed fan power that goes directly to the fan motor 58j is the low speed fan power that goes to the fan motor via a resistor, this is the metal can that is riveted to the radiator. Or is should be, but a lot aren't reattached to the radiator when some swaps the rad for one that isn't leaking, so are dangling in free air somewhere or have touched a bit of the wiring loom and melted it As they get rather hot Share this post Link to post Share on other sites
Super Josh 4 Posted May 2, 2007 Not sure, there are 6 wires coming out of the thermo switch, 3 of wich go to the fan etc and another 3 which go to this plug which isn't connected to anything? The 3 wires that go to a connector that isn't connected to anything are there for Peugeot to test the fan. Short the supply wire to the other two wires, in turn and it will switch the fan between high anf low speed Josh Share this post Link to post Share on other sites
John_205_GTi 0 Posted May 2, 2007 Thanks, is the resistor useful or is it worth linking it out? Share this post Link to post Share on other sites
Super Josh 4 Posted May 2, 2007 Thanks, is the resistor useful or is it worth linking it out? Up to you really. A lot of people link it out, so that the fan only comes on at high speed. That way you can hear the fan is working Josh Share this post Link to post Share on other sites
DrSarty 90 1 Cars Posted May 2, 2007 Still on topic, I wish to reinstate my thermo-switch operated (rather than via dash switch) fan. I have a new thermo switch which has the 3 male prongs on it: 1 x horizontal & 2 x vertical. I completely understand how it works, i.e. one earth feed (horiz pin I think) and 2 live pins - one which goes to the fan motor via the resistor (low speed) and one direct (high speed). Phew.... I've removed the 3 pin female plug with wires which fits to the switch so I can't check the wire numbers. What I want to know is which pin does what, visually? Wire numbers won't help me here. Perhaps someone will check their 3-pin plug for me because I wish to feed it earth, and then one non-resisted power to the single fan I'm going to run, which IMPORTANTLY clicks in at the LOWER TEMP. This is why I need to know which pin does what. One pin will link with earth in the switch at one temp and then the other links at the higher temp. SuperJosh or anyone> Save the day DrS Share this post Link to post Share on other sites
Super Josh 4 Posted May 2, 2007 Rich, you don't want to be feeding it an earth. It's power from the slam panel distri box and then two outputs to the motor, one via the resistor. I would look at mine for you, but as mine has AC the wiring and pinout of the thermoswitch is different. I'm sure someone will post up the details soon Josh Share this post Link to post Share on other sites
DrSarty 90 1 Cars Posted May 2, 2007 Thanks Josh. Yep, that makes sense; it's taking a main power feed which then gets diverted to either slow fan (via the resistor) or high fan (direct to fan motor). The fan's earth must be either direct to ground or grounded through the relay. Anyway, I've figured a plan to check the first pin that goes live based on preset lowest temp reached in the rad. If I suspend my new thermoswitch somehow and attach a live 12v feed to the horizontal pin, and then clip two wires with bulbs in line to negative, and then hold a lighter to the inner face of the thermoswitch, the bulb which lights first is the live pin for what normally is low fan speed, i.e. the lower water actuating temp. If no one else is able to post the verified reply I need, then surely this test will work n'est pas? Rich Share this post Link to post Share on other sites
