Page 1
Electric Cooling Fan
Models 115 & 117
Installation Instructions
Radiator Support Channel Or Frame Installation
1. Attach frame mounting brackets to fan using the 4 3/4’’ self tapping screw.
2. Position fan to desired location, Mark holes on radiator channels or frame.
3. Rotate fan blades to ensure that they are free of obstructions.
4. On the marked hole locations, drill 13/64" holes.
5. Secure the fan to radiator using 1/4" self tapping screws.
6. Check again to be sure the fan blades rotate freely.
Radiator
channel / frame
Frame mounting
bracket
3/4" plastic
self tapping
screw
1" hex head
self tapping
screw
Rev. 02-09-12 98115 Page 1 of 4
Page 2
Wiring Instructions Model 115
NOTE: Model 117 does not include a fan control unit; skip to page 3 of instructions.
FOLLOW THESE INSTRUCTIONS CAREFULLY TO AVOID DAMAGING THE CONTROL
UNIT, FAN MOTORS, AND YOUR VEHICLE! WHEN CRIMPING WIRES, ALWAYS USE
A QUALITY CRIMPING TOOL (DO NOT USE PLIERS OR OTHER DEVICES).
Step 1: Locate mounting point for the control unit
Locate a mounting point for the control box near inlet side of the radiator. The control unit needs
to be placed within about 18" of radiator inlet hose. The inner fender next to the radiator may be a
convenient location. Attach the control unit using the screws provided.
Step 2: Wire the fan motors (refer to Wiring Diagram, below)
Using the blue butt connectors provided, attach a length of the thick (12 AWG) red wire to the red motor wires at fan. Attach a length of the thick (12 AWG) black wire to the black motor wires at the fan.
Once the fan is in place, these will attach to the control unit. Be sure to leave enough wire to reach
the control unit.
WIRING DIAGRAM - MODEL 115 (PULLER CONFIGURATION)
blue butt connectors
thick black
thick
black
NOTE: For pusher conguration, ip the fan blade over and
reverse motor wire polarity (black motor wire positive, red motor
wire negative).
3. Connect the fan wires to the control unit
Now connect the fan motor wires to the control unit. Using blue female connectors provided, connect the
red wire you attached to the fan motor wire in Step 2 to the "M+" terminal. Connect the black wire to
the "M-" terminal on the control unit. NOTE: Failure to do this will result in incorrect operation and
damage to fan motors!
4. Connect power leads
Disconnect the battery negative lead for safety before completing wiring. Determine the length needed
to run thick red and black wire from the control unit to the battery terminals and trim appropriately. Crimp
a large ring connector to one end of each wire and connect the black wire to the negative (-) battery
terminal, but do not connect the red wire yet. Using butt connectors, connect the fuse holder provided
inline with the red wire. The fuse and fuse holder will protect the fan motors and your vehicle's electrical
system from damage. Using blue female connectors provided, connect the red wire to the "B" terminal
and the black wire to the "G" terminal on the control unit.
5. Ignition controlled power source
Locate fuse box. Find a circuit that is "hot " when the key is in the "ON" position. NOTE: DO NOT use
the DRL or brake/taillight fuse! Attach the included fuse tap to fuse. Attach a pink female connector to
the thin red wire included and connect to the fuse tap. Trim the wire so that it will reach the control unit.
Attach pink female connector to end of wire and connect to the "+" terminal on the control unit.
6. Fan operation with air conditioning (if equipped)
Locate the wires coming from the A/C compressor. Determine which wire is ground and which is positive
by using a volt meter. Connect the positive wire to the supplied thin green wire by use of a piggyback
connector. Determine length needed to reach the control unit and trim to length. Attach a pink female
connector to the end of the wire and attach it to the "C" terminal on the control unit.
Rev. 02-09-12 98115 Page 2 of 4
Page 3
Wiring Instructions 115 Cont'd.
7. Manual Switch (Optional)
For manual switch operation, use Flex-a-lite p/n 31148. Connect switch as shown on the wiring
diagram (previous page). To override engine temperature and turn fan on, connect the switch to the
"M" terminal on the control unit. NOTE: To prevent thermostatic activation (if only manual switch
operation is desired), omit the lead to the "+" terminal of the control box. "B", "G", "M+" and
"M-" must remain connected. If using a switch other than a Flex-a-lite manual switch, do not
connect a ground wire to the switch!
8. Secure loose wires
Use the zip ties provided to secure the wires and prevent them from interfering with fan blades, belts,
and pulleys in the engine compartment. Reconnect the battery and insert the fuse into the fuse holder.
9. Insert temperature sensor
Locate the temperature sensor. Gently push probe through ns in radiator as close to the upper radiator
hose as possible. The rubber insulator cap should be used when possible to insulate any of the probe
coming through the front side of the radiator.
Install temp. probe near inlet hose...
10. Adjust the temperature control knob on the control box
If you disconnected any hoses or drained coolant to install the fan, reconnect the hoses and
rell the radiator. Press the control knob (included in wiring kit) onto the control box shaft.
Turn the knob clockwise until it stops. Start the engine and allow it to idle. Using a hand-held
thermometer (positioned near the inlet hose) or the vehicle's temperature gauge, monitor the
temperature. When the coolant temp. is slightly above normal or desired temp. is reached, turn
the knob counter-clockwise just until the fan turns on. From now on, the fan should activate at this
temperature setting. Adjust as necessary to maintain desired temperature.
then replace the insulator cap.
Wiring Instructions - Model 117
1. (Puller conguration): Wire the fan motors to power source (control unit or switch and relay if
desired). Connect the red wires from the fan motors to a 12v. positive (+) source. Connect the black
motor wires to a ground (-) source. NOTE: Failure to do this will result in incorrect operation and
damage to the fan motors!
2. Connect the fuse holder. Be sure to connect the provided fuse holder in-line with the positive (+)
power wire to protect the fan motors and your vehicle's electrical system from damage.
NOTE: For pusher conguration, ip the fan blade over and
reverse motor wire polarity (black motor wire positive, red motor
wire negative).
Rev. 02-09-12 98115 Page 3 of 4
Page 4
Troubleshooting the electric fan
Problem Possible Cause How to nd out Solution
Fan does not turn
on regardless of
temperature
“+” terminal on control
box not connected to
proper source
Fan still does not turn onFuse to battery
positive post blown.
Wires to terminals
“B” and “G” aren’t
properly hooked up.
Fan still does not turn onMotor wired
improperly
Trace wire connected
to the “+” terminal.
Use a voltmeter or
test light to check for
voltage.
Inspect the fuse in the
holder.
Check for power and
ground through lines
hooked to terminals
“B” & “G”.
Check to see that the
blue motor wire runs
to the “M+” terminal
and the black motor
wire runs to the “M-“
terminal on the control
box.
If there is no power to
the “+” terminal, nd
an ignition-switched or
constant 12v. power
source and wire it to
the “+” terminal on the
control box.
Replace fuse.
Hook up wires for
terminals “B” & “G” to
battery and ground
respectively.
Connect wires to
correct terminals.
If motor does not spin
after checking wiring,
call tech support at
1-800-851-1510.
Fan does not come on
until the temperature
is very hot
Fan was working
properly but suddenly
shut down
When engine is
started, fan comes on
even though engine is
cold
Temp. probe not
located in optimum
position
Temperature set to
high
Usage of a chassis
ground and/or
alternate source for
power other than
positive terminal on
battery
Constant (always
“hot”) 12v source
hooked to “C” terminal
Check location of
temp. probe.
Locate temperature
adjusting knob on top
cover of control box
Trace wire from
terminals “B” and “G”
to nd source.
Trace the wire
connected to the “C”
terminal and make
sure it is spliced into
the positive trigger
wire from the A/C
compressor clutch.
Temp. probe should
be located nearest the
upper radiator hose.
Turn knob counterclockwise to set the
control box to a lower
temperature.
Move to posts on the
battery.
Splice into the positive
trigger wire to the A/C
clutch and connect
to the “C” terminal on
control box.
A/C or defrost turned
on
The Flex-a-lite Limited Warranty
Flex-a-lite Consolidated, 7213-45th St. Ct. E. Fife, WA 98424, Telephone No. 253-922-2700, warrants to the original purchasing user, that all Flex-a-lite products to be free of defects in material and
workmanship for a period of 365 days (1 year) from date of purchase. Flex-a-lite products failing within 365 days (1 year) from date of purchase may be returned to the factory through the point of
purchase, transportation charges prepaid. If, on inspection, cause of failure is determined to be defective material or workmanship and not by misuse, accidental or improper installation, Flex-a-lite
will replace the product free of charge, transportation prepaid. Flex-a-lite will not be liable for incidental, progressive or consequential damages. Some states do not allow the exclusion or
limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specic legal rights and you may have other rights, which vary
from state to state.
The Flex-a-lite warranty is in compliance with the Magnuson-Moss Warranty Act of 1975.
Check if defrost
activates a/c or if the
a/c is on.
Rev. 02-09-12 98115 Page 4 of 4
Shut off a/c or leave
on as this is normal
operation.
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