23 · Diagnostics

Climate control too cold

Make: Fiat
Model: Panda Factory Service Manual
Year: 2003–2012
Section: Climate control › Climate control too cold

‹ Prev Fan'' will not work at different speeds Next › Climate control not heating

Fault diagnosisClimate control too cold

CLIMATE CONTROL TOO COLD

Manual Air Conditioning

The control button activates the passenger compartment fan properly but the temperature of the air is not correct.

1	SYSTEM PRESSURE CHECK	All OK	Problems encountered	Operation
		Results of the tests
	Connect the climate control system to the special repressurizing equipment and check the pressures See Test 5040OB AIR- CONDITIONER SYSTEM OPERATION CHECK (PRESSURES)	Move on to Step 2	System pressure not correct.	Restore the correct system pressure value
		Move on to Step 2	Refrigerant pressurizing too low or too high	Restore the correct coolant level Op. 0010T84 COOLANT FOR AIR CONDITIONING SYSTEM DEHYDRATE AND RECHARGE
2	CHECK ON CORRECT MANUAL CONTROL OPERATION	All OK	Problems encountered	Operation
	Before starting, check the following conditions: ambient temperature around 20 °C vehicle with doors and windows closed (during the cooling and measuring of the temperature) With the engine on, at ambient temperature (check using the diagnostic equipment that the passenger compartment temperature and evaporator sensors indicate about 20 °C), with the vehicle compressor on, adjust the temperature to maximum cold LO, the distribution to the front position, the speed for the selector to the 2nd speed and the outside air intake function. After about 5 minutes in these conditions, check using the diagnostic equipment that the temperature values for the passenger compartment and evaporator sensors show a decrease: from the initial temperature of about 20 °C (ambient temp.) and gradually decrease to a temperature of about 3.5°C for the evaporator sensor and between 6 and 10°C for the front distribution air vents. Check whether the temperature of the air coming out of the vents actually alters (becoming colder)	Move on to Step 5	The air coming out of the climate control vents does not feel colder	Move on to Step 3
3	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner diagnostic equipment and check: that there are no faults in the outside temperature sensor that there are no faults in the front sensor	Move on to Step 5	Error at the outside temperature sensor	Move on to Step 4
		Move on to Step 5	Error at the frost sensor	Move on to Step 4
4	ELECTRICAL CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check the continuity/insulation of the electrical connection: of the sensor if there is an error at the outside temperature sensor; of the frost sensor if there is an error at the frost sensor	Move on to Step 5	Electrical connection broken or not insulated.	Restore the continuity/insulation of the electrical connection.
5	PIPE AND FILTER CHECK	All OK	Problems encountered	Operation
	Check that the air conditioning high and low pressure pipes are not blocked	Move on to Step 6	Pipe from compressor to condenser obstructed.	Replace the pipe from the compressor to the condenser Op. 5040A50 PIPE FROM COMPRESSOR TO AIR CONDITIONER CONDENSER - R+R
			Pipe from condenser to drier filter obstructed	Replace the pipe from the condenser to the drier filter Op. 5040A52 PIPE FROM CONDENSER TO DEHYDRATING FILTER - R+R
			Pipe from drier filter to expansion valve blocked	Replace the pipe from the drier filter to the expansion valve Op. 5040A54 PIPE FROM DEHYDRATING FILTER TO EXPANSION VALVE - R+R
6	CONDENSER CHECK	All OK	Problems encountered	Operation
	Check that the condenser is not blocked or fouled with mud	Move on to Step 7	Condenser blocked	Replace the condenser Op. Op. 5040A40 AIR CONDITIONER CONDENSER - R+R
	Check that the condenser is not blocked or fouled with mud	Move on to Step 7	Condenser fouled	Remove the fouling by washing
7	CHECK ON CORRECT OPERATION USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Check that the following errors do not persist: at the outside temperature sensor at the frost sensor	Move on to Step 8	Outside temperature sensor error.	Replace the outside temperature sensor Op. 5010D12 OUTSIDE AIR TEMPERATURE SENSOR ON DOOR MIRROR - R+R FOLLOWING ELECTRICAL CIRCUIT CHECK
		Move on to Step 8	Frost sensor error	Replace the frost sensor Op. 5040B64 SENSOR ON EVAPORATOR FOR A/C ECU - R + R
8	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists.	Search for the problem in the climate control flexible transmission cables/kinematic mechanisms

Automatic Air Conditioning

The control button activates the passenger compartment fan properly but the temperature of the air is not correct.

1	SYSTEM PRESSURE CHECK	All OK	Problems encountered	Operation
		Results of the tests
	Connect the climate control system to the special repressurizing equipment and check the pressures See Test 5040OB AIR- CONDITIONER SYSTEM OPERATION CHECK (PRESSURES)	Move on to Step 2	System pressure not correct.	Restore the correct system pressure value
		Move on to Step 2	Refrigerant pressurizing too low or too high	Restore the correct coolant level Op. 0010T84 COOLANT FOR AIR CONDITIONING SYSTEM DEHYDRATE AND RECHARGE
2	CHECK ON CORRECT OPERATION OF CLIMATE CONTROL NODE	All OK	Problems encountered	Operation
	Before starting, check the following conditions: ambient temperature around 20 °C vehicle with doors and windows closed (during the cooling and measuring of the temperature) With the engine on, at ambient temperature (check using the diagnostic equipment that the passenger compartment temperature and evaporator sensors indicate about 20 °C), with the vehicle compressor on, place the control unit to AUTO, adjust the temperature to maximum cold LO, the distribution to the front position, the fan speed to 3 bars and the outside air intake function. After about 5 minutes in these conditions, check using the diagnostic equipment that the temperature values for the passenger compartment and evaporator sensors show a decrease: from the initial temperature of about 20 °C (ambient temp.) and gradually decrease to a temperature of about 3.5°C for the evaporator sensor and between 6 and 10°C for the front distribution air vents. Check whether the temperature of the air coming out of the vents actually alters (becoming colder)	End of diagnosis	The air coming out of the climate control vents does not feel colder	Move on to Step 3
3	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner diagnostic equipment and check: that there are no errors at the air mixture actuators 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 front sensor	Move on to Step 5	Error at the air mixture actuators	Move on to Step 4
			Error at the outside temperature sensor	Move on to Step 4
			Error at the passenger compartment temperature sensor	Move on to Step 4
			Error at the frost sensor	Move on to Step 4
4	ELECTRICAL CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check the continuity/insulation of the electrical connection: of the air mixture actuator(s) if there is an error at the mixture actuator of the sensor if there is an error at the outside temperature sensor; of the sensor if there is an error at the passenger compartment temperature sensor of the frost sensor if there is an error at the frost sensor	Move on to Step 5	Electrical connection broken or not insulated.	Restore the continuity/insulation of the electrical connection.
5	PIPE AND FILTER CHECK	All OK	Problems encountered	Operation
	Check that the air conditioning high and low pressure pipes are not blocked	Move on to Step 6	Pipe from compressor to condenser obstructed.	Replace the pipe from the compressor to the condenser Op. 5040A50 PIPE FROM COMPRESSOR TO AIR CONDITIONER CONDENSER - R+R
			Pipe from condenser to drier filter obstructed	Replace the pipe from the condenser to the drier filter Op. 5040A52 PIPE FROM CONDENSER TO DEHYDRATING FILTER - R+R
			Pipe from drier filter to expansion valve blocked	Replace the pipe from the drier filter to the expansion valve Op. 5040A54 PIPE FROM DEHYDRATING FILTER TO EXPANSION VALVE - R+R
6	CONDENSER CHECK	All OK	Problems encountered	Operation
	Check that the condenser is not blocked or fouled with mud	Move on to Step 7	Condenser blocked	Replace the condenser Op. 5040A40 AIR CONDITIONER CONDENSER - R+R
	Check that the condenser is not blocked or fouled with mud	Move on to Step 7	Condenser fouled	Remove the fouling by washing
7	CHECK ON CORRECT OPERATION USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Check that the following errors do not persist: at the air mixture actuators (after the self-learning procedure, if necessary) at the outside temperature sensor at the passenger compartment temperature sensor at the frost sensor	End of diagnosis	Left air mixture actuator error	Replace the left air mixture actuator Op. 5040D84 AIR CONDITIONING LEFT HAND AIR MIXER FLAP CONTROL MOTOR - R.R
			Right air mixture actuator error	Replace the right air mixture actuator Op. 5040D86 AIR CONDITIONING RIGHT HAND AIR MIXER FLAP CONTROL MOTOR - R.R
			Outside temperature sensor error.	Replace the outside temperature sensor Op. 5010D12 OUTSIDE AIR TEMPERATURE SENSOR ON DOOR MIRROR - R+R FOLLOWING ELECTRICAL CIRCUIT CHECK
			Passenger compartment temperature sensor error	Replace the passenger compartment temperature sensor Op. 5010D30 PASSENGER COMPARTMENT AIR TEMPERATURE SENSOR - R+R FOLLOWING ELECTRICAL WIRING CHECK OPERATION
			Frost sensor error	Replace the frost sensor Op. 5040B64 SENSOR ON EVAPORATOR FOR A/C ECU - R + R

‹ Prev Fan'' will not work at different speeds Next › Climate control not heating

Parts & tools for this job For 2003 Fiat Panda

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