Horton DRIVEMASTER Instrucciones De Instalación página 17

TROUBLESHOOTING
PROBLEM
3. Excessive cycling.
III. Fan Drive fails to
engage/disengage
PROBABLE CAUSE
3. a. A/C freon overcharge.
b. A/C pressure switch
setting too low.
c. Poor ground or wire
connection.
d. Improper temperature
control setting.
e. Faulty ECM.
f. Faulty Thermal Switch.
g. Restriction in front of
radiator blocking air flow.
h. Faulty Air-Temp Switch.
Air Problem
1. Solenoid Valve not exhausting
or engaging properly.
Electrical Problem
1. Open/shorted circuit.
2. Improperly wired.
3. Thermal Switch incorrect for
application.
4. Failed Solenoid Valve.
Air Problem
1. Air line restricted.
2. Solenoid Valve defective.
17
SOLUTION
3. a. Check and adjust to
specifications.
b. Check A/C pressure
switch.
c. Check electrical
connections.
d. Check temperature
setting of all controls.
Thermal Switch setting
should engage the Fan
Drive 10 F higher than the
o
full open temperature of
the thermostat.
e. Check ECM.
f. Replace the Thermal
Switch.
g. Check for proper shutter
operation, winter front or
other restriction in or in
front of the radiator.
h. Replace the Air-Temp
Switch.
1. Check for plugged exhaust/
intake port on the Solenoid
Valve. Clean or replace the
Solenoid Valve.
1. Check electrical connections.
2. Check wiring according to
diagram.
3. Check Thermal Switch
application. Replace if wrong
or defective.
4. Replace the Solenoid Valve.
1. Check air line from solenoid
to Fan Drive for kinks or
obstructions.
2. Replace the Solenoid Valve.
Check to see if air exhaust is
restricted.
English
22748-J-0407