Scotty72 Posted January 14, 2019 Share Posted January 14, 2019 Last year my fan stopped working after removing the dash to tidy up the wiring. As a temporary measure the guy who rebuilt my engine wired in a relay which works but the fan is constantly switching on/off at 85C. I now want to remove the temporary fix, revert to normal setup and try to trace back why it stopped working in the first place. Can anybody help with a wiring diagram please or explain how it should be wired up. Thanks in Advance Quote Link to comment Share on other sites More sharing options...
Ian Kinder (Bagpuss) - Joint Peak District AO Posted January 14, 2019 Share Posted January 14, 2019 Hi Scott, See attached loom diagram. The standard fan relay should be under the scuttle somewhere next to the flasher relay. Put your hazards on and follow the clicking to find it. The fuse shown as 15A Below is incorrect for the factory provided SPAL fan and 20A is needed. The fan should be controlled by the stat in the radiator. If you link this, the relay should close and the fan should run continuously. The fan connector shown for completeness- Best regards, Ian 4833 Chassis Harness.pdf Quote Link to comment Share on other sites More sharing options...
Scotty72 Posted January 14, 2019 Author Share Posted January 14, 2019 Cheers Ian I've disconnected the temp relay and am now left with this. Where does the BlackGreen cable go to? Quote Link to comment Share on other sites More sharing options...
Ian Kinder (Bagpuss) - Joint Peak District AO Posted January 14, 2019 Share Posted January 14, 2019 The black green cable is the postive feed to the fan. N5 is a battery fed feed to the relay. BG102 is +12V when the relay is on. It goes to the fuse with wire BG102. BG14 is the wire from the fused side of the fuse to the fan positive. If you link out the thermstat. Is the fan relay energised? 1 Quote Link to comment Share on other sites More sharing options...
Scotty72 Posted January 14, 2019 Author Share Posted January 14, 2019 If I link out the thermostat the fan comes on..... Could it be a dodgy thermostat? Quote Link to comment Share on other sites More sharing options...
Ian Kinder (Bagpuss) - Joint Peak District AO Posted January 14, 2019 Share Posted January 14, 2019 2 minutes ago, Scotty72 said: If I link out the thermostat the fan comes on..... Could it be a dodgy thermostat? Have you now got it wired correctly as per the diagram on the loom diagram? If so and it's still cycling on and off, I agree your rad stat is stuffed. It should have some hysteresis built in. i.e. Switch on at 90 degrees and off at 95 degrees. Quote Link to comment Share on other sites More sharing options...
Scotty72 Posted January 14, 2019 Author Share Posted January 14, 2019 Yes I reconnected to the loom and ran it up to 97C and NO Fan. Then linked out the stat and the fan came on straight away. Any idea for a part number to replace it? I have a motorfactors next door to where I work. Quote Link to comment Share on other sites More sharing options...
Ian Kinder (Bagpuss) - Joint Peak District AO Posted January 14, 2019 Share Posted January 14, 2019 13 minutes ago, Scotty72 said: Yes I reconnected to the loom and ran it up to 97C and NO Fan. Then linked out the stat and the fan came on straight away. Any idea for a part number to replace it? I have a motorfactors next door to where I work. I've no idea what vehicle the factory part is from sorry, and I've not got one as my EWP controller switches my fan on and off too. The factory have them in stock 97 on, 92 off : https://parts.westfield-sportscars.co.uk/index.php?route=product/product&product_id=638&search=switch&description=true or This one 87 on 77 off,: https://parts.westfield-sportscars.co.uk/index.php?route=product/product&product_id=995&search=switch&description=true It's a M22 thread. Given the Honda coolant Stat is set to open at 87 degrees C, I'd suggest the first one more suited to your car. How are you measuring the coolant temp ? The Dash2 value may not be so accurate. An temp gun on the head outlet or your laptop connected to your ECU to see what water temp that reports could be worth doing. Quote Link to comment Share on other sites More sharing options...
Scotty72 Posted January 14, 2019 Author Share Posted January 14, 2019 I don't have a heat gun so I will plug in laptop tomorrow morning (I've left it at home) Thanks for your help.....Much appreciated Quote Link to comment Share on other sites More sharing options...
Ian Kinder (Bagpuss) - Joint Peak District AO Posted January 14, 2019 Share Posted January 14, 2019 It's on this tab 1 Quote Link to comment Share on other sites More sharing options...
Terry Everall Posted January 18, 2019 Share Posted January 18, 2019 Thanks but the one I was referring to was a simple line diagram which I could understand Quote Link to comment Share on other sites More sharing options...
Ian Kinder (Bagpuss) - Joint Peak District AO Posted January 18, 2019 Share Posted January 18, 2019 This isn't off a westie but should help: Quote Link to comment Share on other sites More sharing options...
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