Horton HT650 - Troubleshooting Common Issues

TROUBLESHOOTING
PROBLEM
PROBABLE CAUSE
SOLUTION
Fan Drive
fails to
engage
Electrical Problem
1. Broken circuit (Normally
OpenSystem).
2. Improperly wired.
3. Thermal Switch incorrect for
application.
4. Bad Solenoid Valve.
1. Check electrical
connections.
2. Check wiring according
to diagram.
3. Check Thermal Switch
(N.O.orN.C.).
4. Replace the Solenoid
Valve.
Air Problem
1. AirleaksinFanDrive.
2. Restricted air supply to the
Fan Drive.
3. Bad Solenoid Valve.
1. Install new O-ring
Seals.
2. Check the RotaryAir
Unionandairlinesfor
leaks or restrictions.
3. Replace the Solenoid
Valve.
Fan Drive
fails to
disengage
Electrical Problem
1. Broken circuit (Normally Closed
System).
2. Improperly wired.
3. Bad Thermal Switch.
1. Check electrical
connections.
2. C h e c k w i r i n g
a c c o r d i n g t o
diagram.
3. Rep l ac e T her m al
Switch.
Air Problem
1. Airlinerestricted,notallowing
air to exhaust from F a n
Drive.
2. Bad Solenoid Valve.
1. C h e c k th e a i r l i n e
between the Fan Drive
and Solenoid Valve
f o r r e s t r i c t i o n s o r
obstructions.
2. Replace the Solenoid
Valve.
Fan Drive
engaged,
engine
running
hot
1. Check for shutter
operation, winter
fronts, or obstructions
in front of radiator.
2. Refer to vehicle engine
manual.
1. Restriction in front of radiator.
2. Cooling system mal-function.
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