| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Having carried out the road test, during the See table S015 NOISE WHILST DRIVING, there was a noise from the front identified as coming from the passenger compartment heater fan. | Move on to Step 1 | | |
| 1 | FAN CHECK | All OK | Problems encountered | Operation |
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| Check the climate control fan. In particular, check: - that the fan and spiral is clean, if there are any foreign bodies, deposits of dust on the vanes and/or leaves remove them/blow through moving the fan from the engine support;
- that there are no breaks or cracks in the fan;
- there are no vibrations or noise at low speed (check the operation with the fan detached from the assembly but the electrical connection fitted).
 | "The operation for determining vibrations should be carried out with great care to avoid fragments of the fan being expelled into the surrounding area. Protective goggles must also be worn". |
| Move on to Step 2 | 1. Fan dirty.2. Presence of breaks/cracks in the fan.3. Electric motor noisy, fan not balanced or blades. | 1. Clean the fan casing and all the ducts.2. Replace the fan Op. 5040C30 AIR CONDITIONING FAN - R.R. 3. Replace the fan Op. 5040C30 AIR CONDITIONING FAN - R.R. |
| 2 | AIR DUCT CHECK | All OK | Problems encountered | Operation |
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| Check for foreign bodies and damaged components inside the air ducts. | Move on to Step 3 | Presence of foreign bodies or damaged components inside the air ducts. | Eliminate the obstructions from the dashboard ducts. |
| 3 | AIR VENT CHECK | All OK | Problems encountered | Operation |
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| Check that the vents are intact and that there are no foreign bodies that could create noise. | Move on to Step 4 | Vents obstructed. | Restore the operation of the vents. |
| 4 | POLLEN FILTER CHECK | All OK | Problems encountered | Operation |
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| Check that the pollen filter is not blocked and that the recirculation air intake is not blocked with foreign bodies or parts (e.g. wiring) that are not correctly fitted. | Move on to Step 5 | 1. Filter obstructed.2. Air intake blocked by foreign bodies. | 1. Replace the filter element Op. 5010B08 CLIMATE CONTROL OUTSIDE AIR PURIFYING (POLLEN) FILTER - R.R. 2. Eliminate the obstructions and restore correct operation. |
| 5 | FAN INTAKE CHECK | All OK | Problems encountered | Operation |
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| Check that the fan intake in the air intake chamber is not blocked by the presence of foreign bodies. | End of diagnosis | Presence of foreign bodies in the air intake chamber. | Eliminate the obstructions and restore correct operation. |