22 · Diagnostics

Climate control too cold

Make: Fiat
Model: Ulysse Factory Service Manual
Year: 2002–2010
Section: Climate control › Climate control too cold

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Fault diagnosisClimate control too cold

CLIMATE CONTROL TOO COLD

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

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check: that there are no errors in the climate control system node (NCL) parameter plausibility.	Move on to Step	1. Presence of errors.	1. Continue following the instructions for the diagnostic equipment
			2. Parameters not plausible	2. Continue following the instructions for the diagnostic equipment
			3. No communication between climate control system control unit	3. Restore connection between the climate control unit and diagnostic connector See E6020 AIR CONDITIONING
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check: that there are no faults in the engine management node. parameter plausibility	Move on to Step	1. Presence of faults.	1. Continue following the instructions for the diagnostic equipment
			2. Parameters not plausible.	2. Continue following the instructions for the diagnostic equipment
			3. No dialogue with the engine management control unit	3. Restore the connection between the engine management control unit and the diagnostic connector See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	that there are no faults in the engine management node parameter plausibility	Move on to Step	1. Presence of faults	1. Continue following the instructions for the diagnostic equipment
			2. Parameters not plausible	2. Continue following the instructions for the diagnostic equipment
			3. No dialogue with the engine management control unit	3. Restore the connection between the engine management control unit and the diagnostic connector
3	AIR TEMPERATURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the temperature of the air at the vents	Move on to Step	Temperature not correct	Move on to Step
4	SYSTEM PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the climate control system to the special repressurizing equipment and check the system pressures See Test 5040B SYSTEM SAFETY CHECK DEVICES	Move on to Step	1. High and Low pressure values below the correct figures	1. Repressurize the system Op. 5040A10 EXPANSION/CONNECTION PIPE - R R
			2. High and Low pressure values above the correct figures	Move on to Step
			3. High and Low pressure values do not alter when the air conditioning is activated.	3. Replace the compressor Op. 5040A10 EXPANSION/CONNECTION PIPE - R R
			4. Condenser cooling fan is not activated/deactivated at the correct pressures	Move on to Step
5	CIRCUIT CAHRGE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the system charge is not too high.	Move on to Step	System charge too high.	Restore the correct charge Op. 5040A10 EXPANSION/CONNECTION PIPE - R R
6	COOLANT CIRCUIT OBSTRUCTIONS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the pipes and the filter are not obstructed.	Move on to Step	1. Pipe from compressor to condenser obstructed	1. Replace the pipe
			2. Pipe from condenser to filter obstructed	2. Replace the pipe
			3. Pipe from filter to expansion valve obstructed	3. Replace the pipe
			4. Filter obstructed	4. Replace the filter Op. 5040A44 AIR CONDITIONER DEHYDRATING FILTER/ACCUMULATOR - R+R
7	CONDENSER CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the condenser is not blocked.	Move on to Step	Condenser blocked	Replace the condenser Op. 5040A40 AIR CONDITIONER CONDENSER - R+R
8	EXPANSION VALVE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the operation of the expansion valve.	Move on to Step	Expansion valve defective	Replace the expansion valve Op. 5040B30 EXPANSION VALVE (TUBE ORIFICE) - R+R
9	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists	Replace the climate control node.

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Parts & tools for this job For 2002 Fiat Ulysse

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