Flex-a-Lite 31147 User Manual

Adjustable Temperature

Control Kit

Assembly & Installation Instructions

1. Attach the temp. control unit to the mounting bracket
using the hardware provided, then push the knob onto
the control shaft.

2. The control can be mounted to any at surface in the

engine compartment that is within 18” of the radiator inlet
hose. Use the 3 mounting screws provided.

3. Insert the temp. sensor thru the radiator core as close to
the inlet hose as possible, then push the rubber insulator
cap over the end of the sensor as shown.

4. Connect the “C” terminal on the control unit to the
positive (+) lead on electric fan unit. For automatic
operation, connect the “2” terminal on the control unit to
a fused positive (+) source that is capable of powering
the electric fan unit (refer to wiring diagram below). Use
the female connectors provided.

Insert the temp. sensor near the inlet hose...

Then push the insulator cap over the end of

the sensor.

Wiring Diagram

5. If manual control is desired, use P/N 31148 / 31148N.

Refer to wiring diagram below. NOTE: If not using

a Flex-a-lite manual switch, DO NOT connect the
ground (-) wire to the switch!

To Adjust Temperature Control

Turn the adjusting knob on the controller completely 1.
clockwise. Idle the vehicle.

When the engine temperature gets above normal, turn 2.
the adjusting knob counterclockwise until fan activates.
Adjusting knob may be adjusted counter-clockwise to
reduce the temperature at which fan a activates.

#’s

31148 / 31148N

Rev. 04-15-13 99936