Flex-a-Lite 57291 Radiator & Fan GM Truck/SUV - Manual (Page 3)

When crimping the temp
probe wires, strip back the
insulation, and then fold
wire back on itself to double
thickness
7. Find a convenient place to mount the circuit breaker between
the VSC and the battery positive (+) terminal and use the two
screws provided to mount it. Cut the red wire at the point where
you mounted the breaker. Find the red boot and lay it on the
breaker as shown in Detail 3. Connect small yellow ring
connectors to the ends of the wires and attach them to the
circuit breakers. NOTE: BE SURE TO CONNECT THE END COMING
FROM THE BATTERY (+) TO THE “BAT” TERMINAL ON THE
BREAKER (COPPER COLORED).
Now press the top of the boot over the breaker terminals to protect from arcing. Connect a large ring
connector to the junction box end and connect it to the terminal as shown.
8. Locate fuse box. Find a circuit that is “hot” when the key is in the “ON” position. NOTE: DO NOT use
the day time running lights or brake/taillight fuse, or any fuse directly related to the fuel or ignition
system! Attach the included fuse tap to the 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 VSC. Attach a pink female
connector to the other end of wire and connect to terminal #9 on the VSC.
9. Locate the wires going to the A/C clutch. Determine which wire is ground
and which wire is positive by using a volt meter. Connect or splice the thin
green wire to the positive (+) wire of the A/C compressor using the blue
“Piggy-Back” connector. Determine length of green wire needed to reach
VSC. Rout green wire then trim to length. Attach a pink female connector
to the wire. Connect this wire to terminal #8 on VSC.
10. Locate the temperature probe. Gently push probe through fins in radiator
as close to the upper radiator hose as possible, leaving about ¼” of the probe protruding out of the
core. The rubber cap will not be used in this application. Determine length of wire needed to reach
VSC.
IMPORTANT: Strip insulation back about 1” and fold the wire onto itself to
effectively double the thickness of the wire before connecting the pink
female connectors. Then attach this wires to terminals #10 & #11. Both
wires need to be connected but it doesn’t matter which wire goes to each
terminal.
11. If manual switches (Flex-a-lite #31148) have been purchased, attach them
as follows: to override engine temperature to turn fans off, connect the
switch to terminal #5 on VSC to send a negative (-) signal. To override
engine temperature to turn fans on, connect the switch to terminal #6 on
the VSC so that the negative (-) signal is sent.
Detail 3
Install the temp probe near
the inlet hose, leaving ¼” of
the probe protruding from
the core
Rev. 04-01-13 #99291 Page #3 of 6