| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Connect the climate control systme to the special repressurizing equipment and check the pressure of the system See Test 5040OB AIR CONDITIONING SYSTEM OPERATION CHECK (PRESSURE)Check the wear condition and correct belt alignment and tensioning.Run the engine at idle speed with the A/C system off and check whether the noise comes from other auxiliary components (engine fan, water pump, alternator). Increase the rpm and check for vibrations. | Move on to Step 2 | 1. Pressure level incorrect2. Belt alignment/tension incorrect or belt worn.3. The noise is from other auxiliary components (engine cooling fan, coolant pump, alternator). | 1. Move on to Step 12. Restore correct alignment/tension or replace the belt.3. Continue as indicated in the diagnostic test procedure. |
| 1 | CHECK PRESSURE VALUES IN HIGH AND LOW PRESSURE CIRCUIT | All OK | Problems encountered | Operation |
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| Keep the recharging device connected and check the pressure levels in the system high and low pressure circuit with the compressor on and engine running:- pressure values low in high and low pressure circuit;- pressure values high in high and low pressure circuit; | End of diagnosis | 1. Low circuit pressure values (insufficient coolant in circuit)2. High circuit pressure values (too much coolant, mainly gas, in circuit) | 1. Check for leaks in the system and restore the circuit seal if necessary. Then flush the system and restore the correct charge of fluid and gas Op. 0010T84 COOLANT FOR AIR CONDITIONING SYSTEM - DEHYDRATE AND REPRESSURIZE 2. Flush the system and restore the correct charge of fluid and gas Op. 0010T84 COOLANT FOR AIR CONDITIONING SYSTEM - DEHYDRATE AND REPRESSURIZE  | If the compressor is replaced due to a mechanical problem, remember to clean the entire circuit and change the drier filter. |
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| 2 | CHECK ON FASTENING OF PIPES AND COMPONENTS | All OK | Problems encountered | Operation |
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| Check that the compressor and system pipes and components are correctly fastened.Check the following, in order:- compressor fastening to the bracket on the engine block;- fastening of pipes (by bands and spacers)- no interference between pipes and other components in the engine compartmentAlso check for cracks in the compressor fastenings to the bracket on the engine block. | Move on to Step 3 | 1. Fastening of components incorrect2. Interference in the engine compartment3. Also check for cracks in the compressor fastenings to the bracket on the engine block. | 1. Retighten fastenings to torque2. Restore the correct layout of the pipes3. Replace the compressor Op. 5040A20 AIR CONDITIONING COMPRESSOR - R+R - INCLUDES FLUID LEVEL CHECK AND TOP UP IF NECESSARY |
| 3 | CHECKS TO CARRIED OUT WITHOUT THE COMPRESSOR ON | All OK | Problems encountered | Operation |
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| - disconnect the service belt and check for contact between the armature and pulley;- with the belt disconnected, check for contact between the pulley and external elements;- Check the wear of the pulley bearing by rotating the moving plate in both directions of rotation.- Check whether the compressor magnetic coupling shows signs of overheating. | Move on to Step 4 | 1. Presence of contact between armature and pulley.2. Presence of contact between the pulley and external elements.3. Bearing worn4. Signs of overheating on the compressor magnetic coupling | 1. Replace the compressor electromagnetic coupling with pulley2. Remove the contact.3. Replace the pulley4. Replace the pulley | If the compressor is replaced due to a mechanical problem, remember to clean the entire circuit and change the drier filter. |
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| 4 | CHECKS TO CARRIED OUT WITH THE COMPRESSOR ON | All OK | Problems encountered | Operation |
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| After restoring the correct connection of the service belt, turn the compressor on and off to check:- visually if the compressor magnetic coupling plate slips due to oil or grease on the plate;- if slippage takes place between the compressor belt and pulley. | Move on to Step 5 | 1. Oil or grease on the plate.2. Slippage between compressor belt and pulley. | 1. Clean the oil or grease off the plate and find the oil leak.2. Replace the belt and/or pulley |
| 5 | CHECK FOR GAS LEAKS ON THE COMPRESSOR SIDE | All OK | Problems encountered | Operation |
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| With the engine started and the climate control system at the maximum speed (compressor button ON), place the temperature adjustment knob/button in the maximum cold position, move the probe of the leak detector near the connector to be analyzed and check for any leaks. If there is a leak, repeat the test to make sure that there really is a leak.Withdraw the pipes from the compressor and ensure that the o-rings on the pipes are correctly positioned.Check the condition of the pipe fastening threads on the compressor.With the engine off and the compressor off, bring the leak detector probe up to the compressor pulley near the shaft stem and rear cylinder head gasket to check for leaks. If there is a leak, repeat the test to make sure that there really is a leak.Also check whether the leak is located in other coolant system components. | End of diagnosis | 1. Compressor pipe o-rings poorly positioned (pinching).2. Pipe fastening threads not intact.3. Leak located on shaft stem or compressor rear head.4. Leak located in other cooling system components. | 1. Reposition the compressor pipe o-rings correctly.2. Replace the compressor or restore the thread, where possible Op. 5040A20 AIR CONDITIONING COMPRESSOR - R+R - INCLUDES FLUID LEVEL CHECK AND TOP UP IF NECESSARY 3. Replace the compressor Op. 5040A20 AIR CONDITIONING COMPRESSOR - R+R - INCLUDES FLUID LEVEL CHECK AND TOP UP IF NECESSARY 4. Remove the leak and restore the circuit to correct operation. | If the compressor is replaced due to a mechanical problem, remember to clean the entire circuit and change the drier filter. |
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