MacDon M1170 - Page 431

214733 415 Revision A
Problem Solution
Section
Symptom: Air conditioning cools intermittently.
Unit icing up due to thermostat
adjusted too low
Adjust thermostat. Contact Dealer.
Unit icing up due to excessive
moisture in system
Contact Dealer.
—
Unit icing up due to incorrect super-
heat adjustment in the
expansion valve
Contact Dealer.
—
Thermostat defective Contact Dealer.
—
Defective blower switch or
blower motor
Contact Dealer.
—
Partially open, improper ground or
loose connection in compressor
clutch coil
Contact Dealer.
—
Compressor clutch slipping Contact Dealer.
—
Symptom: Air conditioning system too noisy.
Defective winding or improper
connection in compressor clutch coil
or relay
Contact Dealer.
—
Excessive charge in system Contact Dealer.
—
Low charge in system Contact Dealer.
—
Excessive moisture in system
Contact Dealer.
—
Loose or excessively worn drive belt Tighten or replace as required.
Tensioning Air Conditioner (A/C)
Compressor Belts, page 362 and
Replacing Air Conditioner (A/C)
Compressor Belts, page 363
Noisy clutch
Remove clutch for service or
replacement as required.
Contact Dealer.
Noisy compressor
Check mountings and repair. Remove
compressor for service or
replacement.
Contact Dealer.
Compressor oil level low Add SP-15 PAG refrigerant oil. Contact Dealer.
Blower fan noisy due to
excessive wear
Remove blower motor for service or
replacement as necessary.
Contact Dealer.
Symptom: Cab windows fog up.
High humidity
Run A/C to dehumidify air and heater
to control temperature.
3.10.3 Climate Controls, page 60
TROUBLESHOOTING