If underdrive pulleys are installed and the vehicle is prone to overheating at idle, a jumper is provided (13,14) to render a 10 % minimum current to the fan whenever the ignition is on in order to aid in convection flow. The ignition input wire must be connected to use this feature.

Setting the Temperature

The controller is set from the factory for use with a 180 degree thermostat, the set temperature, however, can be adjusted byway of the multiturn potentiometer. Each turn clockwise will raise the temperature approximately 3 1/2 degrees, each turn ccw will lower the temperature by the same amount. A total adjustment of +/- 35 degrees is possible.

Find a flat surface in the engine compartment, the preferred area being the radiator support sheet metal near the battery. Drill four 1/8" holes either by the dimensions shown in figure 2 or by using the control unit as a template. Drill two more 1/8" holes at about 8" centers as shown in figure 2. If installed in a detailed engine compartment, insert the four grommets in the mounting holes of the control unit to protect painted surfaces. Mount the control unit using four self tapping screws and flat washers.

Figure 1a shows the Delta temperature probe. Its low mass, high friction housing and high flex multi strand wiring loom provide a fast response time and convenient mounting, requiring no retaining mechanism. Simply insert the probe between the radiator fins and the mounting is complete. Unlike other control systems, the DCC fan control operates most accurately when the temperature is indicated downstream from the cooling fan.

Figure 1b shows the correct mounting position on a conventional radiator. Mounting is below the fan, and near the outlet hose.

1. Plug the mounted sensor into pins 1, 2 of the control unit.

2. Using the supplied wiring loom, secure one connectored end of the red wire on the output terminal of the controller using one star washer and brass 6-32 hex nut. A snug fit is all that is needed (5-in-lb), Be careful not to overtighten. Route the wire to the positive fan terminal, cut and trim the wire and install the butt connector to connect the fan  wiring.

3. Place one connectored end of the black wire on the GND terminal of the controller. Route the wire to the negative fan terminal, cut and trim the wire and install the butt connector to connect the fan  wiring.

4. Place the connectored end of the remaining black wire on the GND terminal of the controller and secure both wires with one star washer and 6-32 brass hex nut. Route the wire to the negative battery terminal. Attach the 5/16 ring terminal and connect to the negative battery terminal.

5. Place the connectored end of the remaining red wire on the input terminal of the controller and secure the wire with one star washer and brass 6-32 hex nut. Route the wire to the positive battery terminal. Attach the fusible link and connect to the positive battery terminal. Do not connect to the starter end of the battery cable or to the alternator. Use the supplied wire hold downs, along with two self tapping screws and flat washers to secure the wires.

                                      Figure 2

Start the car. If equipped with air conditioning, turn on the AC, the fan should run at 50 % power without the underdrive jumper and 100% with the jumper. Check the direction of airflow and reverse the fan input wires if necessary. Turn off the AC and let the engine warm up. The fan should run at the necessary speed to stabilize engine temperature.