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Alfa Romeo GT 1.9 JTD 16V – ENGINE COOLING – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Wiring diagram - ENGINE COOLING - Alfa Romeo GT 1.9 JTD 16V

ENGINE COOLING - WIRING DIAGRAM Alfa Romeo GT 1.9 JTD 16V

Components - ENGINE COOLING - Alfa Romeo GT 1.9 JTD 16V

Component code	Description	Reference to the assembly
B1	JUNCTION UNIT
B1	JUNCTION UNIT
B5	MAXI FUSE-1 BOX	-
B99	MAXIFUSE BOX ON BATTERY
C1	BATTERY EARTH	-
C11	RIGHT FRONT EARTH ( FRONT )	-
H1	IGNITION SWITCH
J30	ENGINE FAN 1ST SPEED RELAY ( FRONT )	-
J31	FAN 2ND SPEED RELAY	-
J32	FAN 2ND SPEED RELAY	-
K10	4 STAGE PRESSURE SWITCH ( FRONT )
M10	ENGINE MANAGEMENT ECU	1056B
M10	ENGINE MANAGEMENT ECU
N11	ENGINE FAN MOTOR - 1
N12	ENGINE FAN MOTOR - 2
O10	ENGINE FAN ADJUSTMENT RESISTOR - 1
O12	ENGINE FAN ADJUSTMENT RESISTOR -2

Component location - ENGINE COOLING - Alfa Romeo GT 1.9 JTD 16V

ENGINE COOLING - COMPONENT LOCATION Alfa Romeo GT 1.9 JTD 16V

Components - ENGINE COOLING - Alfa Romeo GT 1.9 JTD 16V

Component code	Description	Reference to the assembly
B1	JUNCTION UNIT
B1	JUNCTION UNIT
B5	MAXI FUSE-1 BOX	-
B99	MAXIFUSE BOX ON BATTERY
C1	BATTERY EARTH	-
C11	RIGHT FRONT EARTH ( FRONT )	-
H1	IGNITION SWITCH
J30	ENGINE FAN 1ST SPEED RELAY ( FRONT )	-
J31	FAN 2ND SPEED RELAY	-
J32	FAN 2ND SPEED RELAY	-
K10	4 STAGE PRESSURE SWITCH ( FRONT )
M10	ENGINE MANAGEMENT ECU	1056B
M10	ENGINE MANAGEMENT ECU
N11	ENGINE FAN MOTOR - 1
N12	ENGINE FAN MOTOR - 2
O10	ENGINE FAN ADJUSTMENT RESISTOR - 1
O12	ENGINE FAN ADJUSTMENT RESISTOR -2

Description - ENGINE COOLING - Alfa Romeo GT 1.9 JTD 16V

The radiator and air conditioner condenser cooling system consists of an electric fan operated at two different speeds:the first speed is activated at an initial engine coolant temperature level or a certain air conditioning refrigerant fluid pressure;the second speed is engaged at a higher temperature or pressure.The fan is operated by means of two specific relays located near the engine compartment junction unit.The supply line for the fan is protected by two special fuses, located in the engine compartment junction unit.The fan only comes on with the ignition ON.

Operational description - ENGINE COOLING - Alfa Romeo GT 1.9 JTD 16V

The relays T6and T7of the engine compartment junction unit B1manage the engagement of the fan N11at two speeds: the coils are supplied by the ignition-operated line (15/54) whilst the power lines are protected by fuses F6 and F7, in the engine compartment junction unit B1.Both are energized by an earth signal coming from the engine management control unit M10.If the engine coolant reaches an initial temperature level, or the 4 stage pressure switch K10signals to the control unit M10- pin 42 of connector A - that the initial pressure level has been reached, then the control unit M10sends a signal from pin 90 of connector A - to the 1st fan speed relay T6, which then sends the power supply to the fan N11the fan turns at the first speed (slow).If the engine coolant reaches a higher temperature level, or the 4 stage pressure switch K10signals to the control unit M10pin 81 of connector A that the higher pressure level has been reached, then the control unit M10sends a signal from pin 69 of connector A - to the 2nd fan speed relay T7, which then sends the power supply to the fan N11directly: the fan turns at the maximum speed.