Microfilter, Replacing - BMW 1989-1995 525i Service Manual

HEATING AND AIR CONDITIONING
640-1
640 Heating and Air Conditioning
GENERAL
640 -1
HEATER AND CONTROLS
640-1
Blower motor, removing and installing 640-1
Blower series resistance,
replacing (IHKR II, IHKR III) 640 -2
Blower final stage unit. replacing
(IHKR I, IHKA) 640 -2
Heater valve, replacing 640 -3
Auxiliary coolant pump, replacing 640 -4
Heater core, replaci ng 640-4
Outside temperature sensor, replacing 640-5
Heater core temperature sensor, replacing . . 640-5
Distribution control panel ,
removing and installi ng 640-6
Distribution control panel cables,
replacing (IHKR cars only) 640-6
Air distribution motors, replacing 640-6
AIR CONDITIONING
640-7
AlC system, warnings and cautions 640-7
NC
compressor, replacing
(M20/M30 engines) 640 -8
GEN ERAL
The repair information given under this heading applies to
the heating and air conditioning system. Many of the proce-
dures require that the NC refrigerant charge be evacuated.
Table a. Heating Ventilation and Air Conditioning
System Applications
Model
I
HVAC System
1988·1990 (s-cvnnoer cars)
IHKRI
-
1991 (6-cyhnder cars) IH KR II
-
-
1992·1995 (6·cylinder cars ) IHKRIII
- -
1994-1995 (8-cylinder cars) IH KA
NC
compressor, replacing (M50 engine) 640-9
NC
compressor, replacing (M60 engine) 640 -10
NC
condenser, replacing 640 -10
NC
rece iver/drier, replacing 640-1 1
NC
evaporator and expansion valve,
removing and installing 640-11
NC
evaporator temperature sensor,
replacing 640-13
NC
microfilter, replacing 640-13
NC
control module, removing and installing . 640-13
Technical data, refrigerant specifications. . . . 640-14
TABLES
a. Heating Ventilation and Air Conditioning
System Applications 640-1
b. Blower Motor Test Values 640-2
c. Outside Temperature Sensor Test Values 640-5
d. Heater Core Temperature Sensor Test Values. 640-5
e. Evaporative Temperature Sensor
Test Values 640 -13
f.
NC
System Refrigerant Capacities 640 -14
HEATER AND CONTROLS
Blower motor, removing and installing
1. Disconnect negative (-) battery terminal.
2. On cars with coolant expansion tank in rear of engine
compartment, remove hose from overflow tank and dis-
connect electrical connector from level sensor in tank.
Unbolt expansion tank and move to one side.
3. Unclip wire harness protective cover on rear bulkhead.
Cut wire ties as necessary.
4. Remove bulkhead splash shield by removing six retain-
ing screws. See Fig. 1.
HEA TER AND CONTROLS