New Holland CX720 Repair Manual page 3104

BODY AND STRUCTURE - ENVIRONMENT CONTROL Air-conditioning system
Problem
Low blower air pressure
Recirculation inoperative Recirculation Door Control
ENVIRONMENT CONTROL Air-conditioning system -
Troubleshooting (E.40.C - G.40.A.10)
Problem
No cooling
Insufficient cooling
Noisy system
Possible Cause
Separater Blower
Recirculation Door Actuator
Possible Cause
A/C mode switch not on.
Temperature control switch not rotated fully
counter-clockwise towards the blue index.
Loose or broken compressor drive belt.
Loss of refrigerant.
Compressor clutch does not engage.
Insufficient air flow through evaporator.
Faulty expansion valve operation.
Faulty compressor.
Dirty evaporator coil and/or filter.
Temperature control switch not rotated fully
counter- clockwise towards the blue index.
Dirty condenser core.
Low refrigerant charge.
Water valve partially open.
Compressor drive belt slipping.
Evaporator icing up.
Faulty thermostatic switch.
Faulty expansion valve.
Faulty blower fan.
Plugged or restricted filter-drier.
Moisture in the system.
Faulty compressor.
Faulty compressor clutch.
Noise in compressor.
Excessive charge in system.
E-Separator
TestVentilation
fan - Testing (E.40.B.60.20 - G.40.A.20).
G-Recirculation
TestRecirculation
(E.40.B.62 - G.40.A.20).
J-Actuator
Actuator
G.40.A.20).
Turn A/C mode switch on.
Rotate temperature control counter-clock-
wise.
Check belt and tension. Replace as re-
quired.
Perform system tests - recharge.
Perform electrical checks of clutch circuit.
Check air filter.
Check evaporator core and clean if re-
quired.
Check blower motor operation.
Defective blower fans.
Conduct "System Performance Test" - re-
place as needed.
Conduct "System Performance Test" - re-
pair as needed.
Visual inspection - clean.
Rotate temperature switch counter-clock-
wise.
Visual inspection - clean.
Perform system tests - recharge.
Visual inspection.
Visual inspection - replace or adjust as
needed.
Perform system tests.
Visual inspection of capillary tube to outlet
tube.
Perform system tests - replace if needed.
Visual inspection of capillary tube to outlet
tube.
Perform system tests - replace if needed.
Visual inspection of fan rotor and fastening
to motor shaft. Repair or replace.
Perform system tests - replace if needed.
Visually inspect moisture indicator on the
filter-drier.
Perform system tests - evacuate and
recharge.
Replace the filter-drier.
Perform system tests - overhaul if needed.
Replace clutch assembly.
Replace compressor.
Perform system test and adjust charge.
2 4/7/2006
E.40.C / 76
Correction
Blower and
system Separator
System and
system -
TestRecirculation
- Testing (E.40.B.62.36
Correction
Circuit
Circuit
Testing
system
-