BENDIX BW1811 manual AD-IPAIR Dryer Troubleshooting Chart

AD-IP™AIR DRYER TROUBLESHOOTING CHART (Continued)

SYMPTOMS	CAUSE	REMEDY
2. Water and/or Oil in		Discharge Line Freeze-Up. The discharge line must
		maintain a constant slope down from the
Supply or Service
		compressor to the air dryer inlet fitting to avoid low
Reservoir (continued).
		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. Compressor malfunction.	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. Air by-passes desiccant	H. If vehicle uses Holset compressor, inspect
	cartridge assembly.	feedback check valve for proper installation and
		operation.

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