Flex-a-Lite 57291 Radiator & Fan GM Truck/SUV - Manual (Page 4)

Initial start-up and Adjustment Procedure
1. Turn ignition on. After 6 seconds, LED #L4 should light up. If not, check to make sure that there is 12
Volts at terminal #9 on VSC. The delay is to allow starter to start the vehicle without the fans drawing
any power.
2. With your engine running, engage the A/C. The fans should come on and cycle with the A/C clutch. LED
#L1, L3 and L4 should be lit when the fans are running. If they do not turn on, verify that the A/C clutch
is engaged and make sure you have a positive signal when the clutch is engaged at terminal #8 on the
VSC. Shut off A/C and let engine continue to idle, or drive the vehicle a short distance to bring the
engine to operating temperature (monitor the engine’s temperature gauge).
3. Verify that operating temperature has been reached by feeling the upper radiator hose. Hot coolant
should be flowing through the hose into the radiator. If the fans have not cycled on yet, slowly adjust
the screw on the VSC until the fans cycle on. Turning the screw counterclockwise will keep the engine
at a lower temperature, and turning in the opposite direction, clockwise, will keep the engine at a
higher temperature. NOTE: THE TOTAL MOVEMENT OF THE ADJUSTMENT SCREW IS ABOUT ¾ OF A
TURN. TURNING THE SCREW BEYOND THE LIMITS WILL DAMAGE THE UNIT! Once desired
temperature is set, let the engine continue to idle and make sure the fans will continue to cycle to
maintain desired temperature. When the fans are running, LED’s #L1 and L4 should be lit.
To Register Your Product:
Visit our website @ www.flex-a-lite.com/warranty-registration
The Variable Speed Control features
At the set temperature, the fans will come on at 60%;
This reduces the load on your charging system. If the
temperature rises, the fan speed will increase. If your
set temperature is 195° and 205° the fan speed will
increase from 60% to 10%. So after a 10-degree rise
from the set point, the fans will be running at 100%.
The Flex-a-lite Limited Warranty:
Flex-a-lite Consolidated, 7009-45 th Street Court East, Fife, Washington 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 the
date of purchase. Flex-a-lite products falling within 365 days (1 year) 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 specific 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.
Rev. 04-01-13 #99291 Page #4 of 6