Flex-a-Lite 778 without Controls Toyota Tundra Electric Fan Kit; 00-06 - Manual (Page 4)

Initial VSC Set-up and Adjustment
1. Turn ignition on. After 5-6 seconds, LED #4 should light up, if not, check to make sure that you
have 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. Your fans should come on and cycle with the A/C
clutch. LED’s #1, 3 and 4 should be lit when fans are running. If they do not turn on, verify that
the A/C clutch is engaged and make sure that you have the appropriate wire connected to the
correct terminal on the VSC. Shut off A/C and let engine continue to idle until it reaches normal
operating temperature. Verify that normal operating temperature has been reached by feeling
upper radiator hose. Hot water should be flowing through the hose into radiator.
3. Adjusting the VSC to come on at normal operating temperature is done as follows: Locate adjust-
ment screw through center of cover. Using a small strait bladed screwdriver turn the screw to the
full clockwise position, let the vehicle reach desired operating temperature, then dial it back
counter clockwise just until the fans engage.
Note: Maximum rotation of adjusting screw is ¾ turn!
DO NOT FORCE ADJUSTMENT!
4. Once desired temperature is set, let engine continue to idle in order to make sure the fans will
cycle and maintain desired temperature. When fans are running, LED’s #1 and 4 should be lit.
09-02-09 part no. 99777 Page 4 of 5