BMW 3 (E46). Manual — part 290
Replace heater and A/C flange
O-rings and tighten fasteners to
specified torques.
Tightening torques
Coolant hose clamp
32 - 48 mm
(2 1/4 - 4 in.)
2.5 Nm (22
in-lb)
Steering column to
dashboard
reinforcement
22 Nm (16 ft-lb)
640-6
Air Conditioning
Components
This section covers removal and
installation of air conditioning
refrigerant components. A/C testing
and diagnosis, refrigerant discharge,
evacuation and recharge are not
covered here.
The A/C condenser, compressor,
receiver dryer, pressure sensor,
refrigerant lines and expansion valve
are either installed in the engine
compartment or accessible from the
engine compartment.
The A/C evaporator is located in the
IHKA housing. Removal of the IHKA
housing involves dashboard removal.
Before starting work, disconnect the
battery negative (-) cable in the trunk.
Be sure to read the battery
disconnection cautions on page viii and
the airbag warnings in
721 Airbag
System (SRS)
.
Note:
The air conditioning system is filled
with R-134a refrigerant.
A/C system
components
1
-
High pressure
line
2
-
Sealing O-ring
(always replace)
3
-
Receiver-dryer
4
-
Condenser
5
-
Compressor
6
-
Low pressure
line
7
-
Access port
8
-
Double pipe
9
-
Expansion valve
10
-
Evaporator
11
-
Access port
12
-
Pressure sensor
A/C compressor, replacing
-
Following manufacturer's
instructions, connect an approved
refrigerant recovery/recycling
/recharging unit to A/C system and
discharge system.
WARNING!
Do not discharge/charge the A/C
system without proper equipment and
training. Damage to the vehicle and
personal injury may result.
-
Remove splash shield from under
engine.
-
Mark A/C drive belt with direction of
rotation.
Release tension on A/C belt:
Use long-handled wrench to turn
tensioner pulley release lug (A)
clockwise (against spring tension).
Remove drive belt.
-
Detach and set aside front washer
fluid reservoir. See
611 Wipers
and Washers
.
-
Disconnect electrical harness
connector from compressor.
Remove A/C pressure hose and suction
hose flange bolts (arrows) from
compressor. Plug hoses immediately.
-
All-wheel-drive model: Unbolt and
lower front stabilizer bar. See
310 Front Suspension
.
Support compressor while removing
compressor mounting bolts (arrows).
Remove compressor.
-
Installation is reverse of removal.
CAUTION!
Always replace O-rings when
reconnecting refrigerant lines.
When installing a new
compressor always replace
receiver/drier unit.
Tightening torque
A/C line to A/C
compressor
20 Nm (15 ft-lb)
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