BENDIX AD-IP INTEGRAL PURGE AIR DRYER Manual page 20

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AD-IP AIR DRYER TROUBLESHOOTING CHART (Continued)
SYMPTOMS
2. Water and/or Oil in
Supply or Service
Reservoir (continued).
20
CAUSE
G. Compressor malfunction.
H. Air by-passes desiccant
cartridge assembly.
REMEDY
Discharge Line Freeze-Up. The discharge line must
maintain a constant slope down from the
compressor to the air dryer inlet fitting to avoid low
points where ice may form and block the flow. If,
instead, ice blockages occur at the air dryer inlet,
insulation may be added here, or if the inlet fitting is
a typical 90 degree fitting, it may be changed to a
straight or 45 degree fitting. For more information on
how to help prevent discharge line freeze-ups, see
Bendix Bulletins TCH-08-21 and TCH-08-22. Shorter
discharge line lengths or insulation may be required
in cold climates.
Insufficient coolant flow through compressor. Inspect
coolant line. Replace as necessary (I.D. is 1/2"
min.). Inspect the coolant lines for kinks and
restrictions and fittings for restrictions. Replace as
necessary. Verify coolant lines go from engine block
to compressor and back to the water pump. Repair
as necessary.
Restricted air inlet (not enough air to compressor).
Check compressor air inlet line for restrictions,
brittleness, soft or sagging hose conditions etc.
Repair as necessary. Inlet line size is 3/4 ID.
Maximum restriction requirement for compressors is
25 inches of water. Check the engine air filter and
service if necessary (if possible, check the air filter
usage indicator).
Poorly filtered inlet air (poor air quality to
compressor). Check for leaking, damaged or
malfunctioning compressor air inlet components
(e.g. induction line, fittings, gaskets, filter bodies,
etc.). Repair inlet components as needed. Note: Dirt
ingestion will damage compressor and is not
covered under warranty.
If you found excessive oil present in the service
reservoir and you did not find any issues above, the
compressor may be passing oil.
Replace compressor. If still under warranty, follow
normal warranty process.
G. If you found excessive oil present in the service
reservoir and you did not find any issues above,
the compressor may be passing oil. Test the
compressor using the BASIC cup method as
described in the Bendix compressor service
manual and referred to in Appendix A, Table A,
column 5.
Replace compressor. If still under warranty, follow
normal warranty process.
H. If vehicle uses Holset compressor, inspect
feedback check valve for proper installation and
operation.