TROUBLESHOOTING
* See Your MacDon Dealer
** Refer to Windrower Technical Manual
Form 169552 / 169554 / 169555
190
Revision A
8.7 CAB AIR
SYMPTOM
PROBLEM
SOLUTION
SECTION
Blower Fan Will Not
Run.
Burned out motor.
Contact your Dealer.
*
Burned out switch.
Motor shaft tight or bearings worn.
Faulty wiring - loose or broken.
Blower rotors in contact with housing.
Blower Fan Operating
But No Air Coming Into
Cab.
Dirty fresh air filter.
Clean fresh air filter.
7.7.6.1
Dirty recirculating air filter.
Clean recirculating (return) air filter
7.7.6.2
Evaporator clogged.
Clean evaporator.
7.7.6.4
Air flow passage blocked.
Remove blockage.
---
Heater Not Heating.
Heater shut-off valve at engine closed.
Open valve.
5.10.3
Defective thermostat in engine water
outlet manifold.
Replace thermostat.
**
Heater temperature control defective.
Replace control.
No thermostat in engine water outlet
manifold.
Install thermostat.
Odor From Air
Louvers.
Dirty filters.
Clean fresh air and re-circulation filters.
Plugged drainage hose.
Blow out hose with compressed air.
Air Conditioning Not
Cooling.
Blower motor disconnected or burned out. Contact your Dealer.
*
Switch contacts in thermostat burned
excessively or sensing element defective. Replace thermostat.
**
Low refrigerant level.
Add refrigerant
**
Clutch coil burned out or disconnected.
Contact your Dealer.
*
Broken or disconnected electrical wire.
Check all terminals for loose
connections.
Check wiring for hidden breaks.
**
Broken or disconnected ground wire.
Check ground wire to see if loose,
broken, or disconnected.
**
Condenser fins plugged.
Clean condenser.
7.9.3
Loose or broken drive belt.
Replace drive belt and/or tighten to
specifications.
7.8.10.3
Plugged filters.
Clean fresh air and recirculating filters.
7.7.6
Compressor partially or completely
seized.
Remove compressor for service or
replacement.
**
Expansion valve stuck in open or closed
position.
Contact your Dealer.
*
Broken refrigerant line.
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