Passenger side temperature adjustment does not work

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: Climate control › Passenger side temperature adjustment does not work

‹ Prev Climate control recirculation (automatic mode) not working Next › Air heating is not activated with low outside temperature

Fault diagnosisPassenger side temperature adjustment does not work

PASSENGER SIDE TEMPERATURE ADJUSTMENT DOES NOT WORK

AUTOMATIC AIR CONDITIONING

When the desired temperature is set, passenger side, this temperature is not implemented. The automatic climate control is on the dual zone version only.

1	CHECK ON CORRECT OPERATION OF CLIMATE CONTROL NODE	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the engine running and the compressor switched off, set the control unit to the AUTO function (MONO button off) and adjust the temperature using the passenger side temperature knob from cold to hot. Also select the recirculation button to the closed position and set the fan speed to 3-4 bars (display) and the distribution to front ventilation. Using the Examiner, check that the engine temperature has reached at least 70°C. Feel whether the air coming out of the vents varies in temperature (getting hotter). Now carry out the operations to check the passenger compartment cooling function: with the engine running, the ambient temperature around 20°C and the compressor on, set the control unit to AUTO mode, adjust the passenger side temperature knob from hot to cold up to 16°C, the distribution to the front position, the fan speed to 3 bars and the outside air intake function. After around 5 minutes in these conditions check, using the Examiner, that the temperature at the vents is decreasing: from the starting temperature of about 20°C (ambient temperature) gradually decreasing to around 6°C. Feel whether the air coming out of the vents is changing in temperature (getting colder).	End of diagnosis	1. The temperature of the air coming out of the vents does not get hotter.	1. Move on to Step 2
		End of diagnosis	2. The temperature of the air coming out of the vents does not get colder.	2. Move on to Step 2
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment and check: that there are no errors at the passenger side air mixture actuator; that there are no faults in the treater air sensors; that there are no faults in the outside temperature sensor; that there are no faults in the passenger compartment temperature sensor; that there are no faults in the solar sensor.	Move on to Step 3	1. Short circuit or open circuit error at the air mixture actuator.	1. Move on to Step 4
			2. Error at treated air sensor	2. Move on to Step 4
			3. Error at the outside temperature sensor.	3. Move on to Step 4
			4. Error at the passenger compartment temperature sensor.	4. Move on to Step 4
			5. Error at the solar sensor.	5. Move on to Step 4
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the Examiner diagnostic equipment connected, check the operation of the air mixture actuator through active diagnosis.	Move on to Step 4	Air mixture actuator not working	Replace the mixture actuator Op. 5040D77 AIR CONDITIONER MIXER FLAP CONTROL MOTOR - R R
4	ELECTRICAL CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the continuity/insulation of the electrical connection between the climate control node and the passenger side air mixture actuator and the treated air sensors and the outside temperature sensor and the passenger compartment temperature sensor and the solar sensor. Check that the electrical wiring is secure, disconnect the connectors visually inspecting for any damage to the connectors reconnecting the connectors to the climate control node, to the passenger/driver side mixture actuator, the outside air temperature sensor and the solar sensor.	Move on to Step 5	1.Electrical connection broken or not insulated.	1.Restore the continuity/insulation of the electrical connection.
			2. Electrical connection loose or damaged.	2. Refit the electrical connections correctly.
			3. Outside temperature sensor not working.	3. Replace the outside temperature sensor Op. 5010D12 OUTSIDE AIR TEMPERATURE SENSOR ON DOOR MIRROR - R+R FOLLOWING ELECTRICAL CIRCUIT CHECK
			4. Treated air sensor not working	4. Replace the treated air sensor Op. 5010D27 UPPER MIXED AIR TEMPERATURE SENSOR (ONE), LH OR RH - R.R. FOLLOWING ELECTRICAL CIRCUIT CHECK
			5.Solar sensor not working.	5. Replace the solar sensor Op. 5010D56 SOLAR SENSOR - R.R FOLLOWING ELECTRICAL SYSTEM CHECK
			6. Passenger compartment temperature sensor.	6. Replace the climate control system control unit Op. 5040D18 AIR CONDITIONING CONTROL UNIT - R.R.
			7. Mixture actuator not working.	7. Replace the actuator Op. 5040D77 AIR CONDITIONER MIXER FLAP CONTROL MOTOR - R R
5	AIR MIXTURE MOTOR FLAP CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the air mixture motor flap completes its travel without any hinderance.	End of diagnosis	1. Flap travel incomplete.	1.Free from air mixture actuator flap from the impediment.
			2. Replace the flap.	2. Replace the flap.
			3. Kinematic mechanism damaged.	3. Repair kinematic mechanism.

‹ Prev Climate control recirculation (automatic mode) not working Next › Air heating is not activated with low outside temperature

Parts & tools for this job For 2005 Fiat Croma

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