23 · Diagnostics

Climate control not heating

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Climate control › Climate control not heating

‹ Prev Climate control does not cool to the desired temperature Next › Climate control recirculation not working

Fault diagnosisClimate control not heating

CLIMATE CONTROL NOT HEATING

The climate control is working properly and sends air according to the preset flows but this air does not guarantee the required heating.

0	PRELIMINARY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Disconnect the battery and reconnect it at the Key Off and wait 2 minutes for the Key On checking whether there is a variation in the temperature requested.	End of diagnosis	There is no variation in the temperature requested.	Move on to Step 1
1	REFRIGERANT FLUID LEVEL CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the engine coolant level is within the preset levels and that the refrigerant fluid circulates correctly in the system.	Move on to Step 2	1.Engine coolant level too low.	1.Restore the correct level checking that there are no leaks. Op. 0010T84 COOLANT FOR AIR CONDITIONING SYSTEM - DEHYDRATE AND REPRESSURIZE
		Move on to Step 2	2.Refrigerant fluidt does not circulate correctly: thermostat valve operationg incorrectly.	2.Follow the See table K025 ENGINE COOLANT TEMPERATURE GAUGE NOT WORKING
2	CHECK ON CORRECT CLIMATE CONTROL SYSTEM OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the engine on and the compressor off, in manual mode with the temperature knob at the maximum hot HI position. Also set the recirculation button to the closed position and set the fan speed to 6 bars (display) and the distribution to front ventilation. Use the diagnostic tester to check that the engine temperature reaches at least 70 °C. Check that the air temperature at the front distribution outlet is greater than 60 °C.	End of diagnosis	The temperature of the air coming out of the vents is not as desired.	Move on to Step 3
2	CHECK ON CORRECT CLIMATE CONTROL SYSTEM OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the engine on and the compressor off, in manual mode with the temperature knob at the maximum hot HI position. Also set the recirculation button to the closed position and set the fan speed to the 3rd setting and the distribution to front ventilation. Use the diagnostic tester to check that the engine temperature reaches at least 70 °C. Check that the air temperature at the front distribution outlet is greater than 60 °C.	End of diagnosis	The temperature of the air coming out of the vents is not as desired.	Move on to Step 3
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment and check: that there are no errors at the air mixing actuators; that there are no faults in the engine temperature sensor.	Move on to Step 4	1.Short circuit to earth at the actuators error.	1.Move on to Step 5
			2. Short circuit to +12V error at the actuators.	2.Move on to Step 5
			3. Mechanical interference / stuck error.	3. Move on to Step 7
			4. Error in the engine temperature sensor	4. Continue as instructed by the diagnostic equipment
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment and check: that there are no errors at the air mixing actuator	Move on to Step 6	1. Short circuit to earth error at the actuator.	1. Move on to Step 5
			2. Short circuit to +12V error at the actuator.	2. Move on to Step 5
			3. Mechanical interference / stuck error.	3. Move on to Step 7
4	CHECKS USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the Examiner diagnostic equipment connected, check the correct operation of the air mixture actuator through active diagnosis.	End of diagnosis	Air mixture actuator not working	Move on to Step 5
5	ELECTRICAL CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose: Disconnect and check for damage in the connector contacts/reconnect the connection to the actuator. Check the continuity/insulation of the electrical connection: of the air mixing actuator/s. the connection on the control unit.	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.Electrical connection broken or not insulated.	2.Restore the continuity/insulation of the electrical connection See E6020 AIR CONDITIONING
6	CHECK ON CORRECT OPERATION OF MIXTURE ACTUATOR	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose. Disconnect and visually inspect for damage at the connector contacts and reconnect the connection to the motor 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.	1. Renew the electrical connections See E6020 AIR CONDITIONING
		End of diagnosis	2. There is no air flow intake into the passenger compartment through the vents.	2. Move on to Step 7.
7	CHECK FOR IMPEDIMENTS TO THE ROTATION OF THE MIXTURE ACTUATORS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Remove the actuator and check using the control unit control that the actuator turns checking for mechanical impediments that prevent its rotation.	End of diagnosis	1.The air mixture actuator does not turn.	1.Replace the air mixture actuator op. 5040D56
		End of diagnosis	2.Kinematic components of flaps broken/stuck.	2.Replace the component that is faulty.

‹ Prev Climate control does not cool to the desired temperature Next › Climate control recirculation not working

Parts & tools for this job For 2005 Alfa Romeo 159

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.