199002695 - 5040AB REFRIGERANT CIRCUIT CHECK

Do not check the air conditioning system in the immediate vicinity of the walls (distance of approximately 2 m) in order to ensure sufficient circulation of the air by the condenser.

STEP	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
1	Connect the air conditioning system repressurizing station.Start up the engine and keep it idling.Set the required passenger compartment temperature to COLD (turn anticlockwise to stop).Set the fan to 4th speed.Switch on the air conditioning (LED on snowflake symbol on).Take the reading from the high pressure gauge and ensure it is greater than 13 bars	Move on to Step 4
2	Check the cooling fan is on.Move on to Step 4	Move on to Step 3
3	Turn the ignition key ON.With the engine off, perform active diagnosis on the cooling fan and ensure it is successful.	Restore the electrical connections between the fan and engine control unit    See E5020 ENGINE COOLING If necessary, replace the fan    Op. 1088E10 RADIATOR COOLING FAN - R + R

Before draining the air conditioning system, check the coolant circuit to ensure there are no leaks.Check the connection to the expansion valve in particular.

STEP	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
4	Turn the ignition key OFF. Drain, empty and refill the air conditioning system with the specified amount of refrigerant.    Op. 0010T84 COOLANT FOR AIR CONDITIONING SYSTEM - DEHYDRATE AND REPRESSURIZE Run the engine for 15 minutes with the bonnet lid closed.Switch on the air conditioning (LED on snowflake symbol on).Set the required passenger compartment temperature to COLD (turn anticlockwise to stop). Adjust the air distribution to passenger head ventilation.Make sure that the recirculation is switched off.Increase the engine rpm up to 1500 rpm for 5 minutes.Take the reading from the high pressure gauge and ensure it is within the range between 9 and 36 bars	Move on to Step 6
5	Take the reading from the low pressure gauge and ensure it is outside the range between 1.7 and 2.2 barsThe test can be considered over	Move on to Step 6
6	Take the readings from the high and low pressure gauges and ensure the pressure difference is at least 5 bars.	Replace the air conditioning compressor
7	Check that the coolant circuit is not blocked with ice or dirty	Clean the coolant circuit. If necessary, replace the faulty components
8	Replace the expansion valve    Op. 5040B30 EXPANSION VALVE (ORIFICE TUBE) - R+R