If your scavenge fans for an S&B Particle Separator are not working properly (i.e. not turning on or not ramping up in speed), please click here to watch a quick video that will help you trouble shoot the issue. Once you perform the steps outlined in the video, please contact S&B technical support with the results, so we can resolve the matter. 

S&B Technical Support:
(909) 947-0015
customerservice@sbfilters.com

Summary of Steps in Video for Non-Operational Fans:

  1. If you are getting 12 volts at the housing connector and the fans are not operational, the fans or the fan harness in the housing is damaged and must be replaced. 
  2. If the housing connector is not getting 12 volts, check for a blown fuse and a broken relay. Replace if necessary. 
  3. If fuse and relay are operational, make sure the connections at the bus bar are tight as they sometimes loosen up after driving. 
  4. If the connections at the bus bar are tight, you likely have a fray somewhere in the wire harness. Use the vehicle lookup on our website to find your part and then you will be able to order a new wire harness under the related items section on the product page. Alternatively, you can call S&B to place an order.

Summary of Steps in Video for Fans That Blow, but Don't Ramp Up in Speed:

S&B made a running change in the past adding lights to our control board to help resolve issues with the operation of our fan; therefore, there are a large amount of units with control boards that do not have the LEDs. These LEDs do not affect the function of the Particle Separator whatsoever as they are merely used for trouble shooting. If you don't have the LEDs on your control board, follow the Step B. If your control board does have the LEDs, follow Step A.

Step A: (Control Board WITH LEDs)

  1. With the key on, you should see one green and one red light. You should feel a low volume of air coming from the fan(s) as the fans are running at about 5% of capacity.
  2. Start the UTV, at idle you should see two (2) green and two (2) red lights. The volume of air coming from the fan(s) will be at about 25% capacity for the rollbar mounted units and 60% for the Particle Separators that are installed under the fender well.
  3. With the vehicle in park and a foot on the brake, have a friend maintain just over 4,000 rpms. At this point, you should see 3 green and 3 red lights and the fan(s) should be blowing significantly more air as they will be running at 100% capacity. 
  4. If you don't see 3 green and red lights and the fans didn't increase in speed, the Ignition Sensor might not be installed properly. Please lookup your vehicle on our website and click on the installation instructions, so that you can verify that the Ignition Sensor was properly installed. Once complete, please take a picture of the position of the Ignition Sensor. Once the Ignition Sensor has been adjusted, repeat step 3. 
  5. If you still don't see 3 green and 3 red lights, your ignition sensor may have failed. Please contact technical support and provide the picture of the installed ignition sensor. 
  6. If you see 3 green and red lights, but the fans still don't increase in speed when performing step 3, you either have a broken fan, damaged fan harness inside the housing or there is debris that is stuck in the fan. Use compressed air to blow out the fan from the outside. If this doesn't work please contact technical support for assistance. 

Step B: (Control Board WITHOUT LEDs) 

  1. With the key on, you should feel a low volume of air coming from the fan(s) as the fans are running at about 5% of capacity for the rollbar mounted units and 20% for the units mounted under the fender well.
  2. Start the UTV, at idle the volume of air coming from the fan(s) will be at about 25% capacity for the rollbar mounted units and 60% for the Particle Separators that are installed under the fender well.
  3. With the vehicle in park and a foot on the brake, have a friend maintain just over 4,000 rpms. At this point, the fan(s) should be blowing significantly more air as they will be running at 100% capacity. 
  4. If the fans don't increase in speed when performing step 3, the Ignition Sensor might not be installed properly. Please lookup your vehicle on our website and click on the installation instructions, so that you can verify that the Ignition Sensor was properly installed. Once complete, please take a picture of the position of the Ignition Sensor. Once the Ignition Sensor has been adjusted, repeat step 3. 
  5. If the fans still don't increase in speed when performing step 3, you either have a broken fan, faulty ignition sensor, a damaged fan harness inside the housing or there is debris that is stuck in the fan. Use compressed air to blow out the fan from the outside. If this doesn't work please contact technical support for assistance.