| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| After carrying out a road test during diagnosis, a noise is heard from the front identifiable as a noise from the passenger compartment fan. See table S015 NOISE WHILST DRIVING | Move on to Step 1 | | |
| 1 | FAN CHECK | All OK | Problems encountered | Operation |
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| Check the climate control/heater 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 wearing protective goggles to avoid fragments of the fan being expelled into the surrounding area" |
| Move on to Step 2 | 1. Fan dirty2. Presence of breaks/cracks in the fan3. Electric motor noisy, fan not balanced or blades noisy. | 1. Clean the impeller, screw and all ducts2. 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 give rise to noise | Move on to Step 4 | Outlets blocked/damagead | 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 obstructed2. 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. |