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stocktake · 21st September 2020, 20:30

Usually when a fan pulses on and off every 5 to 10 seconds or so it is a two speed fan with a failed resistor. BUT I have come across a three speed fan with a failed slow speed and working middle speed that presented the exact same symptoms.

Only sure way is to remove the bumper and have a look, a three speed fan has four wires entering the motor whilst a two speed has two.

If it is a three speed then as the second speed appears to work then it should be repairable with new brushes and if it is a two speed then it simply needs the resistor replacing for a gold one.

One final anomaly is I have come across two speed fans where the resistor is not fitted to the bracket on the cowling but hidden out of sight.

Hope this helps

21st September 2020, 20:30	#3
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,591 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	Usually when a fan pulses on and off every 5 to 10 seconds or so it is a two speed fan with a failed resistor. BUT I have come across a three speed fan with a failed slow speed and working middle speed that presented the exact same symptoms. Only sure way is to remove the bumper and have a look, a three speed fan has four wires entering the motor whilst a two speed has two. If it is a three speed then as the second speed appears to work then it should be repairable with new brushes and if it is a two speed then it simply needs the resistor replacing for a gold one. One final anomaly is I have come across two speed fans where the resistor is not fitted to the bracket on the cowling but hidden out of sight. Hope this helps __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident Last edited by stocktake; 5th October 2020 at 18:11..