MacDon M1170 Operator's Manual page 430

Problem
Loose or broken compressor drive belt
Dirty filters
Broken or disconnected electrical wire
Broken or disconnected ground wire
Expansion valve stuck in open or
closed position
Broken refrigerant line
Leak in system
Compressor shaft seal leaking
Clogged screen in receiver-drier;
plugged hose or coil
Symptom: Air conditioning is not producing sufficient cooling (meaning that air temperature in the windrower cab,
measured at the louvered vent, can be maintained at 14°C [57°F] below ambient air temperature)
Compressor clutch slipping
Thermostat defective or improperly
adjusted
Clogged air filters
Heater circuit is open
Insufficient air circulation over
condenser coil; fins clogged with dirt
or insects
Evaporator fins clogged
Refrigerant low
Clogged expansion valve
Clogged receiver-drier
Excessive moisture in system
Air in system
Blower motor sluggish in operation
214733
TROUBLESHOOTING
Solution
Replace drive belt and/or tighten to
specifications.
Clean fresh air and recirculation filters.
Check all terminals for loose
connections; check wiring for
hidden breaks.
Check ground wire to see if loose,
broken, or disconnected.
Contact Dealer.
Contact Dealer.
Contact Dealer.
Contact Dealer.
Contact Dealer.
Remove clutch assembly for service or
replacement.
Replace thermostat.
Remove air filters, and clean or
replace as necessary.
Lower temperature control in cab, and
close valve on engine).
Clean condenser.
Clean evaporator fins (under cab
floor).
Contact Dealer.
Contact Dealer.
Contact Dealer.
Contact Dealer.
Contact Dealer.
Contact Dealer.
414
Section
Tensioning Air Conditioner (A/C)
Compressor Belts, page 362
Replacing Air Conditioner (A/C)
Compressor Belts, page 363
5.9.1 Servicing Return Air Filter, page
304
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Contact Dealer.
Contact Dealer.
5.9.1 Servicing Return Air Filter, page
304
3.10.3 Climate Controls, page 60
3.10.1 Heater Shut-Off Valve, page 59
Cleaning Left Cooling Module, page
306
Cleaning Air Conditioning (A/C)
Evaporator Core, page 355
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Revision A