
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’s #L1, L3 and L4
should be lit when 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 (OR negative signal at terminal on #7 if A/C compressor is triggered
by a negative signal) 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 vehicle’s temperature gauge).
3. Verify that operating temperature has been reached by feeling the upper radiator hose. Hot water should be flowing through
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 further in this direction will keep the engine at a lower temperature, and turning in the opposite direction 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 cycle to maintain desired temperature. When fans are running, LED’s #L1
and L4 should be lit.
11-03-06 part no. 54998 Page 2 of 2
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 fan 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 limitaion 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.
The Variable Speed Control has new 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°F, then between 195° and 205°
the fan speed will increase from 60% to 100%. So after
a 10-degree rise from the set point, the fans will be
running at 100%.