ajones12 0 Posted October 17, 2006 Just finishing off getting my 91 H plate 1.9 on the road after a couple of years of it standing around. Ran the car up to check that the cooling fans kicked in and yep they did. Second time of trying nothing happened (other than the car getting v hot!!). Any thoughts what the problem could be?? Someone at work mentioned the rad switch can be problematic. Share this post Link to post Share on other sites
maturin23 10 Posted October 17, 2006 The switches are problematic, as can be the wiring (connectors and earthing points can corrode etc) Nice thing is that the wiring loom for the rad fan is seperate from the rest of the car's wiring, so it's quite easy to understand and troubleshoot and/or replace entirely. Do a search on the subject - it's been covered MANY times before - first off you'll find out how to short some pins on the plug to test the fan circuit and bypass the temp switch. Share this post Link to post Share on other sites
ajones12 0 Posted October 17, 2006 One thought we did have was to somehow by-pass the control and get the fans to run just to check they worked. I'll do a search. Thanks. Share this post Link to post Share on other sites
Rob_the_Sparky 9 Posted October 17, 2006 Checking the fans is really simple, take the switch connector off an short 2 pins together at a time (there are 3 pins). One combination will do nougt, one should run fan slowly and one run teh fan fast. If slow not working then you almost certainly need to replace the radiator fan resistor, if they work then replace the switch. Rob P.S. Out of 4 cars I've had to replace the switch on 3... Share this post Link to post Share on other sites
ajones12 0 Posted October 17, 2006 Checking the fans is really simple, take the switch connector off an short 2 pins together at a time (there are 3 pins). One combination will do nougt, one should run fan slowly and one run teh fan fast. If slow not working then you almost certainly need to replace the radiator fan resistor, if they work then replace the switch. Rob P.S. Out of 4 cars I've had to replace the switch on 3... thanks for the info Rob. Forgive the basic question, but, how do you short the 2 pins together? Share this post Link to post Share on other sites
Rob_the_Sparky 9 Posted October 17, 2006 I usually just get a fairly thick bit of wire, strip each end and push each end into into the connector. You will get the odd spark as you do it but nothing that will cause any damage as long as you only short out from one pin to the next on the switch connector. Rob P.S. On my 4 cars (so far) I've never had a duff fan, I've had one dead slow speed fan resistor and one dodgy connector in addition to the 3 duff switches. Share this post Link to post Share on other sites
ajones12 0 Posted October 18, 2006 I usually just get a fairly thick bit of wire, strip each end and push each end into into the connector. You will get the odd spark as you do it but nothing that will cause any damage as long as you only short out from one pin to the next on the switch connector. Rob P.S. On my 4 cars (so far) I've never had a duff fan, I've had one dead slow speed fan resistor and one dodgy connector in addition to the 3 duff switches. Thanks Rob - I'll give it a try! Share this post Link to post Share on other sites
Edp 67 3 Cars Posted October 18, 2006 I've cut the pesky resistor wiring out when I put two fans in as it was pissing me off so much. One minute the slow fan would work then it wouldn't then the fast fan would cut in and out. I did away with it all so now the fan comes on when the engine reaches about 92 degrees and the radiator switch operates. I tried several different resistors too from low mileage cars in the scrapyard. I also have it on a switch inside but I hardly need to use this now. Share this post Link to post Share on other sites
