22 · Diagnostics

Climate control not cooling

Make: Fiat
Model: Multipla Factory Service Manual
Year: 1998–2010
Section: Climate control › Climate control not cooling

‹ Prev Fan will not work at different speeds Next › Climate control working irregularly

Fault diagnosisClimate control not cooling

CLIMATE CONTROL NOT COOLING

The control unit operates the fan which sends air into the passenger compartment normally with the pre-set flows, but this air is at the outside temperature and is not cooled.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
1.6 16v Air Conditioner	Check the condition of the compressor drive belt	Continue to Step 1	Tension incorrect	Replace the belt Op. 1092D10
1.9 JTD 8V Air Conditioner		Continue to Step 1
1	COMPRESSOR ENGAGEMENT CHECK	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the operation of the compressore relay (in the engine management control unit ambient)	Continue to Step 2	Compressore relay faulty	Check and, if necessary, replace the compressor engagement relay
			Component defective	Replace the component involved (if a fuse is involved, search for the cause of the problem)
			Connections not correct	Restore the connections between engine management control unit, relay and compressor coupling See E6021 COMPRESSOR ENGAGEMENT
2	CHECK COMPRESSOR ACTIVATION ELECTRICAL CIRCUIT	All OK	Problems met	Operation
	Check, in order: compressor activation control three-stage pressure switch ( See Test 5040BA Check operation of three-stage pressure switch ) antifrost thermostat - connection between compressor activation relay and control	Continue to Step 3	Connections not correct	Restore the connections
			Pressure switch defective	Replace the pressure switch Op. 5040B14
			Antifrost thermostat defective	Replace antifrost thermostat Op. 5040B64
			Control defective	Change control unit Op. 7065C10
3	CHECK COMPRESSOR ELECTRO-MAGNET COUPLING	All OK	Problems met	Operation
	Check the operation of the compressor electro-magnet coupling and, in particular, that it is correctly connected to earth	Continue to Step 4	Compressor electro-magnet coupling malfunction	Replace the compressor Op. 5040A20complete with electro-magnet coupling
4	SYSTEM PRESSURE CHECK	All OK	Problems met	Operation
	Check the system pressure: See Test 5040B Check on operation of air conditioning system (pressures)	Continue to Step 5	High pressure does not increase or low pressure decreases too much: leaks in the circuit	Locate these leaks Op. 5040A14, then restore the condition of the circuit
		Continue to Step 5	High pressure continues to increase: and the compressor cooling fan does not operate.	See table D31
5	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that there are no reasons why the climate control control unit or the engine control unit do not enable the engagement of the cooling circuit. For more details see DESCRIPTION AND OPERATION: 5040 AIR CONDITIONING CASING AND COMPONENTS	End of diagnosis	Fault persists	Search for the fault starting from another symptom'

‹ Prev Fan will not work at different speeds Next › Climate control working irregularly

Parts & tools for this job For 1998 Fiat Multipla

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