BMW F 36 64 001 M Instructions De Montage page 4

Refrigerant conversion kit (from R12 to R134a)
BMW 3 Series (E 30), (E 36), BMW 5 Series (E 28), (E 34), BMW 6 Series (E 24)
BMW 7 Series (E 23), (E 32), BMW 8 Series (E 31)
Only for use within the BMW dealer organisation.
Specialist knowledge required.
Fitting time approx. 3.5 hours depending on the
condition of and equipment in the car.
The fitting time quoted on the front cover does
not include the time required for replacing the
compressor, if necessary.
1. Safety precautions for handling
refrigerant
Safety precautions must be observed for handling
air conditioning systems in cars filled with the
refrigerant R12 (trade name "Frigen") although this
refrigerant is non-toxic, non-flammable and is not
explosive when mixed with air. Refer to the
appropriate points in the BMW repair instructions
for this purpose.
All O rings on the connections which are
undone for conversion purposes must be
replaced with O rings which are suitable
for use with R134a.
2. Deoil the air conditioning system
with R12 refrigerant
If R12 is available, deoil the air conditioning
system with it.
To remove the mineral oil and R12 from the
refrigerant circulation system, the following work
must be completed.
2.0 Extract the contents of the air conditioning
system by suction
2.1 Evacuate the air conditioning system
(5 minutes)
2.2 Fill the air conditioning system with R12
refrigerant (without oil)
2.3 Start the engine and switch on the air
conditioning system for a maximum of
10 minutes
Repeat steps 2.0 - 2.3
2.4 Extract the contents of the air conditioning
system by suction
2. 1 Deoil the air conditioning system
without R12 refrigerant (see also
TIS-HLI 642328000)
Remove the compressor, heat it and position it
upside down so that the mineral oil can escape
through the intake and outfeed connections. Whilst
this is happening, turn the drive shaft several times
by hand so that the remaining mineral oil can
4
escape. To prevent any deterioration in the cooling
capacity it is important to allow as much mineral oil
as possible to escape from the system. R12
mineral oil is not miscible with PAG oil and will
hinder the heat exchange in the evaporator and
condenser, thus leading to a reduction in cooling
capacity.
3. Convert the air conditioning
system
3.1 Replace the drier bottle
3.2 Replace the O rings on the connections
you have undone
3.3 Replace the pressure switch
On cars with a Bosch compressor which has
one of the following part numbers:
1 377 940 1 377 941
1 377 944 1 377 946
1 385 416 1 385 930
the compressor must be replaced by the Seiko-
Seiki compressor, part number 64 52 8 363 550
and fastening parts.
E30, M3 only
Adjust the connections for the Seiko-Seiki
compressor.
Required part numbers 64 52 8 379,
64 52 8 379 784
3.4 Fit filling connectors
a = Filling connector (marked red) for
connection to the outfeed line
b = Filling connector (marked blue) for
connection to the intake line
c = Outfeed line connector
d = Intake line connector
Remove the protective cap (1).
Screw the filling connectors (a and b) from the
conversion kit on to the connectors (c and d) on
the refrigerant lines.
Screw the protective caps (2) onto the filling
connectors (a and b).
F 36 64 517 M
F 36 64 379 M
E32, E34
Models with high/medium and low pressure
switches
Cut the plug X125 off the main vehicle wiring
harness.
Strip the ends of the cables and connect them as
set out in the BMW repair instructions.
1 377 943
1 377 947
1 386 311