Slipper man Posted May 12, 2011 Share Posted May 12, 2011 I have a strange problem with my radiator fan. It is the ECU controlled version, which used to come on when the Stack showed 84 deg. In the past few days it has stopped working. When I disconnect the fan and put a spare battery across the fan's terminals, it works fine. the wires to the fan show 0 volts until the temperature reaches 84 deg, then shows 12-14v depending on engine revs. And yet the fan doesn't come on! any ideas? Link to comment Share on other sites More sharing options...
mic Posted May 12, 2011 Share Posted May 12, 2011 Check the relay. Link to comment Share on other sites More sharing options...
Slipper man Posted May 12, 2011 Author Share Posted May 12, 2011 Is that the one on the bulkhead? The thing i can't understand is the voltage. If the relay wasn't working, wouldn't the voltage be either 12v all the time or zero? Link to comment Share on other sites More sharing options...
Paul Deslandes Posted May 12, 2011 Share Posted May 12, 2011 Check the fan -ve chassis connection. When you tested with a battery, presumably you connected it directly to the fan wires. Try connecting your test battery -ve to the chassis and the +ve to the fan positive. Link to comment Share on other sites More sharing options...
Slipper man Posted May 12, 2011 Author Share Posted May 12, 2011 I wondered about that too, Paul. The thing that is still confusing me is the voltage. Presumably the two wires to the fan are positive and earth. If so and it is showing a difference of 12v+, why doesn't the fan start? Link to comment Share on other sites More sharing options...
Paul Deslandes Posted May 12, 2011 Share Posted May 12, 2011 I can only think that there is a poor or broken connection in the fan connector. Sometimes those white nylon connectors can either push a pin back so it doesn't make contact or it gets spread so the pin is loose in the socket. They can also get misaligned. Its there somewhere!! Link to comment Share on other sites More sharing options...
6speedmanual Posted May 12, 2011 Share Posted May 12, 2011 Maybe the relay has a high resistance across the contacts. Your voltmeter may show 12v but not enough current can flow to drive the fan? P Link to comment Share on other sites More sharing options...
The Pikey Posted May 12, 2011 Share Posted May 12, 2011 Slipper man I take it you are measuring the 12v with the fan disconnected? If so then take Micks advice and check the relay. It sounds like the contacts are pitted so as soon a current is drawn the volts drop off. Either that or a bad earth on the chassis at the front. Jason Link to comment Share on other sites More sharing options...
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