FK-50P35 Fan and Water Pump Control Kit

Delta Current Control module

Installation

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.

Mounting the control unit

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.

Delta fast response temperature sensor

Mounting the temperature sensor

Figure 1a shows the Delta temperature probe. Figure 1b shows the typical mounting on the thermostat housing. Note that on engines with the thermostat on the engine coolant intake, the probe must be mounted near the outgoing engine (hot side) coolant.

Figure 1a                                                     Figure 1b                

 

Control unit wiring

High current wiring

  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 fan  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. Using the supplied wiring loom, secure one connectored end of the red wire on the wp  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 water pump terminal, cut and trim the wire and install the butt connector to connect the water pump  wiring.

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

  5. 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.

  6. 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

Auxiliary wiring
Ignition input
Connect the yellow ignition input wire of the harness to the unit and to any source that is higher than 6 V whenever the ignition is on.
 

AC input
If the vehicle has air conditioning and a factory installed electric fan, connect the blue AC input wire of the harness to the unit and to the positive terminal of the OEM fan wiring harness. If the vehicle has air conditioning and originally came with a mechanical fan, connect the blue AC input wire of the harness to the air conditioning compressor input.

 

Parts List

 1   control unit

 1   radiator temperature probe

 1   high current wiring harness

 1   low current wiring harness

 1   fusible link

 2   controller to fan connectors

 1   5/16 ring terminal

 2   wire hold downs

 3   internal star washers

 3   6-32 brass nuts

 6   # 6 self tapping screws

 6   flat washers

 4   3/16 rubber grommets

                 

Testing the unit

Turn on the ignition, the wp should run at 20% power (about 5.2V) and the fan should run at about 3% power (about 2V) Let the engine warm, the fan and water pump should maintain the set temperature of the controller.

 

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.