Instruction Manual

Single Fan Wiring Diagram
30 AMP FUSE MAXIMUM
FUSE
(ORANGE)
IGNITION
+12 VDC (YELLOW)
BATTEY
OPTIONAL COOLING FAN OVERRIDE SWITCH
SENDING UNIT (GREY)
GROUND
GROUND (BLACK)
FAN POSITIVE (RED)
General Information:
If the vehicle has overheating problems, there can be many causes. Step one is to determine what is causing the
vehicle to overheat. The chart below provides several problem, cause and solutions to overheating. Please contact
our technical advisors at 800-454-7725 with any additional questions.
Problem Solution(s) Cause(s)
Engine overheats at idle and low speeds Poor air flow through radiator Install electric fan or duct air into
engine compartment.
Poor engine ventilation Install SPAL fan and make sure
engine compartment can vent hot air.
Insufficient radiator Have the core cleaned or replaced
with an appropriate size.
Engine idle circuit too lean Enrich idle circuit.
Engine timing too advanced Retard timing.
Engine overheats continuously Poor radiator / engine combo Install sufficient radiator.
Defective or stuck thermostat Install new thermostat.