22 · Diagnostics

Climate control air flow irregular

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: Climate control › Climate control air flow irregular

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Fault diagnosisClimate control air flow irregular

CLIMATE CONTROL AIR FLOW IRREGULAR

MANUAL AIR CONDITIONING

The flow of air sent by the fan in the passenger compartment using the manual speed control is not sufficient; it does not correspond to the speed set.

1	AIR DUCTS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the air ducts are intact and the vents are not blocked and are correctly positioned in the opening.	Move on to Step 2	1.Air ducts or vents obstructed	1.Restore the operation of the air ducts and the vents removing any material causing an obstruction.
		Move on to Step 2	2.The flow of air does not correspond to the distribution selected	2.Move on to Step 5
2	CHECK ON CORRECT OPERATION OF MAXIMUM SPEED RELAY	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose, disconnect visually inspecting for any damage at the connector contacts. Reconnect the connection to the resistor. Check the operation of the fan at the maximum speed: if it only works at the maximum speed, the relay is broken. Check whether the resistor is broken by checking the electrical continuity in accordance with the test. See Test 5040CF SEQUENTIAL PROCEDURE FOR CHECKING OPERATION OF AIR CONDITIONING FAN RESISTOR	Move on to Step 3	1.Electrical connections loose or damaged.	1. Renew the electrical connections See E6020 AIR CONDITIONING
			2.Relay broken.	2.Replace the ceramic resistor Op. 5040C48 A/C FAN MOTOR RESISTOR - R+R
			3.Resistance values faulty	3.Replace the ceramic resistor Op. 5040C48 A/C FAN MOTOR RESISTOR - R+R
3	CHECK ON CORRECT OPERATION OF SPEED SELECTOR AT THE CLIMATE CONTROL SYSTEM CONTROL UNIT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose, disconnect visually inspecting for any damage to the connector contacts. Reconnect the connection to the selector on the climate control system control unit. Check whether the selector at the control unit is broken by measuring the electrical continuity in accordance with the test See Test 5040DF SEQUENTIAL PROCEDURE FOR CHECKING OPERATION OF AIR CONDITIONING FAN	Move on to Step 4	1.Electrical connections loose or damaged.	1. Renew the electrical connections See E6020 AIR CONDITIONING
			2.Fan not working.	2.Replace the speed selector knob Op. 5040D23 KNOB (ONE) FOR ANY OF THE AIR CONDITIONING CONTROLS - R.R.
			3.Power supply to the relays not correct.	3.Replace the climate control system control unit Op. 5040D17 CONTROL UNIT WITH MANUAL AIR CONDITIONER KNOBS AND BUTTONS R R
4	CHECK ON CORRECT OPERATION OF FAN	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose See E6020 AIR CONDITIONING Disconnect, visually inspecting for any damage at the connector contacts. Reconnect the connection at the engine mounting. Check that it turns at all speeds when activated by the switch. If it does not rotate at the maximum speed, check the maximum fan speed relay. See J041 LEFT DOOR MIRROR ELECTRICAL ADJUSTMENT NOT WORKING	Move on to Step 5	1.Electrical connections loose or damaged	1. Renew the electrical connections See E6020 AIR CONDITIONING
		Move on to Step 5	2.Fan not working.	2.Replace the fan Op. 1088E10 RADIATOR COOLING FAN - R + R
5	CHECK ON CORRECT OPERATION OF FAN MAXIMUM SPEED OPERATING RELAYS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose. Disconnect visually inspecting for any damage to the connector contacts. Reconnect the connection to the relay. Check that the relay is working properly by providing it with a direct 12 V supply.	Move on to Step 6	1.Electrical connections loose or damaged	1. Renew the electrical connections See E6020 AIR CONDITIONING
		Move on to Step 6	2.Maximum speed operating relay not working	2.Replace the maximum speed operating relay Op. 5040C48 A/C FAN MOTOR RESISTOR - R+R
6	CHECK ON CORRECT OPERATION OF DISTRIBUTION ACTUATOR KINEMATIC COMPONENTS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Visually inspect that the mixture actuator is working properly from the climate control system control unit temperature control knob. Check whether the control on the control unit is interrupted when measuring the electrical continuity in the test. See Test 5040CG SEQUENTIAL PROCEDURE FOR CHECKING OPERATION OF PASSENGER COMPARTMENT TEMPERATURE ACTUATOR	End of diagnosis	1.Incorrect operation of actuator	1.Move on to Step 7
			2. Physical impediment to flap rotation	2.Replace the control unit Op. 5040D18 AIR CONDITIONING CONTROL UNIT - R.R.
			3.Incorrect operation of the control actuator on the climate control unit.	3.Replace the climate control system control unit Op. 5040D17 CONTROL UNIT WITH MANUAL AIR CONDITIONER KNOBS AND BUTTONS R R
7	CHECK ON CORRECT OPERATION OF DISTRUBITION ACTUATOR	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the distrubition actuator is working properly by carrying out the test See Test 5040DH SEQUENTIAL PROCEDURE FOR CHECKING OPERATION OF MIXTURE AND DISTRIBUTION ACTUATORS	End of diagnosis	1.Actuator not working correctly.	1.Replace the timing actuator Op. 5040D63 AIR DISTRIBUTION FLAP CONTROL ACTUATORS- R.R. WITH AIR CONDITIONING CASING REMOVED
		End of diagnosis	2.Resistance values incorrect.	2.Replace the timing actuator Op. 5040D63 AIR DISTRIBUTION FLAP CONTROL ACTUATORS- R.R. WITH AIR CONDITIONING CASING REMOVED

AUTOMATIC AIR CONDITIONING

The flow of air sent by the fan in the passenger compartment using the manual speed control is not sufficient; it does not correspond to the speed set.

1	CHECK ON OPERATION OF FAN BY CLIMATE CONTROL SYSTEM CONTROL UNIT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the engine started, set the climate control system control unit to the AUTO position, adjust the temperature to 22 °C, place the recirculation at the outside air intake and the distribution to the front position. Adjust the fan button (+ side) gradually increasing the speed set and then decrease the speed using the button (- side), thereby checking the effect of the air flow rate variation.	End of diagnosis	There is no variation in the air flow rate.	Move on to Step 2
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment and check: that there are no errors at the passenger compartment fan; that there are no errors at the timing actuator; that there are no errors linked to the fan (short circuit errors)	Move on to Step 3	1.Error at passenger compartment fan.	1.Move on to Step 5
			2.Fan operating module error.	2.Move on to Step 5
			3.Error at the distribution actuator.	3.Move on to Step 6
			4.Short circuit error.	4.Move on to Step 4
3	CHECK ON AIR DUCTS AND POLLEN FILTER	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the air ducts are intact and the vents are not blocked and are correctly positioned in the opening. Check that the pollen filter is not obstucted.	Move on to Step 4	1.Air ducts or vents obstructed.	1.Restore the operation of the air ducts and the vents removing any material causing an obstruction.
		Move on to Step 4	2.Pollen filter obstructed.	2.Replace the pollen filter Op. 5010B09 PURIFYING (POLLEN) FILTER FILTER ELEMENT - REPLACE
4	CHECK ON CLIMATE CONTROL NODE ELECTRICAL CONNECTIONS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the engine switched off, remove the control from the dashboard support and disconnect the cables connector from the control unit visually inspecting for any damage at the connector contacts and reconnect it correctly for check for any false contacts.	Move on to Step 5	Electrical connections loose or damaged.	Renew the electrical connections See E6020 AIR CONDITIONING
5	CHECK ON ELECTRICAL CONNECTIONS AND FAN OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose. Disconnect/reconnect the connection to the engine mounting. Disconnect the connector and connect it to a feeder. In these conditions the engine should turn at the maximum speed indicating that the operating module is not working	Move on to Step 6	1.Electrical connections loose	Renew the electrical connections See E6020 AIR CONDITIONING
			2.The fan does not work.	2.Replace the fan Op. 1088E10 RADIATOR COOLING FAN - R + R
			3.The operating module does not work.	3.Replace the fan operating module Op. 1088E20 RESISTOR FOR RADIATOR COOLING FAN - R + R
6	CHECK ON CORRECT OPERATION OF DISTRIBUTION ACTUATOR	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose. Disconnect visually inspecting for any damage at the connector contacts and reconnect the connection to the engine mounting. If it persists, before replacing the actuator, check its operation by manually activating the function that the actuator should carry out. With the engine running, switch on the fan at maximum speed. Place the flaps in the various distribution positions via the control/control unit (manually). Check the air flow in the passenger compartment with your hand at the vents.	End of diagnosis	1.Electrical connections loose or damaged.	Renew the electrical connections See E6020 AIR CONDITIONING
		End of diagnosis	2.There is no air flow into the passenger compartment from the vents.	2.Move on to Step 7
7	CHECK FOR IMPEDIMENTS TO THE ROTATION OF THE DISTIRUBTION ACTUATOR	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Remove the actuator and check using the control unit control that the actuator turns checking for mechanical impediments to its rotation.	End of diagnosis	1.The actuator does not turn.	1.Replace the timing actuator Op. 5040D63 AIR DISTRIBUTION FLAP CONTROL ACTUATORS- R.R. WITH AIR CONDITIONING CASING REMOVED
		End of diagnosis	2.Kinematic components or flaps broken/stuck	2.Replace the components that is faulty.

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Parts & tools for this job For 2005 Fiat Croma

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