5 Series E34 525td (M51) TOUR
High inlet pressure and low outlet pressure indicate a faulty
compressor.
Remedy:
Replace compressor.
Compressor does not run with equal inlet and outlet pressures.
Remedy:
If the anti-icing facility has shut down the compressor, check
evaporator sensor and power supply to clutch. Otherwise check
clutch mechanically (by slipping).
Normal inlet pressure and low outlet pressure indicate an
insufficient fill quantity of refrigerant.
Remedy:
1.
Draw off and measure refrigerant.
2.
If the amount drawn off corresponds approx. to the specified
fill quantity, check expansion valve for unobstructed
throughflow; replace if necessary.
3.
Then evacuate and refill A/C system.
Low inlet pressure and high outlet pressure can be caused by a
variety of factors:
•
Icing of evaporator
Remedy: Check evaporator sensor, replace if necessary.
•
Obstruction on H.P. side after condenser or on L.P. side
Remedy:
Check drier, expansion valve and pipes in these areas for
unobstructed throughflow; clean or replace if necessary.
RA Troubleshooting by pressure measurement (R 134a)
BMW AG - TIS
23.01.2013 08:19
Issue status (12/2007) Valid only until next DVD is issued
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