Removal of Existing Fan & Shroud Assembly:
- Make sure the engine is cool.
- Disconnect negative (-) battery cable from battery.
- Remove radiator cap.
- From under the vehicle;
- a. Remove skid-plate mounted to frame and front cross member.
- b. Slowly loosen pet-cock to drain approximately 1 gallon of coolant.Note:Drain coolant to a level below upper end of the radiator hose.
- c. Remove lower section of the two piece shroud. It is held on by (2ea.) metal clips and (2ea.) molded plastic hooks.
- d. Remove bottom bolts (2ea.) holding fan shroud to radiator side brackets. Save bolts for installation of new shroud.
Installation of New Electric Fan Shroud:
You will want to pre-wire fan motor wires & Variable Speed Controller (VSC) to new fan shroud before mounting to vehicle.
- Careful planning will save time. Look at the wires coming from the motors. The positives from each motor will be connected together, as will the negatives. Drill a 1/4" hole through the center brace in the shroud to pass one pair of motor wires through.(see Detail A).
- Place both red motor wires side by side and smoothly twist together. Completely insert pair of wires into one end of a yellow insulated butt connector. Crimp connector to secure. Repeat with black motor wires to another yellow insulated butt connector(see Detail A).Red motor wire is (+) positive and the black is (-) negative.
- It is easiest to attach the VSC directly onto the front face of the fan shroud. Using the holes in the controller cover for a template, drill two 5/32" holes. Secure the VSC with the two screws provided.
- Drill two 1/4" holes in the shroud where the thick yellow & purple wires from the VSC will pass through to the back side of the shroud(see Detail B & C).
- IMPORTANT:Insert yellow wire into the open end of butt connector containing the two red motor wires and crimp connector securely. Insert purple wire into the open end of butt connector containing the two black motor wires and crimp connector securely. (see Detail C)
- Mount bracket #77502 to drivers side and bracket #77501 to passengers side of shroud. Use the hex bolts and washers provided.
- Lower shroud assembly between engine and radiator and loosely mount at top using OEM bolts to original shroud mounting points.Note: Be very careful not to damage core.
- From under the vehicle:
- a. Attach bottom of shroud using OEM bolts to original shroud mounting points and tighten.
- b. Reinstall protective skid plate.
Initial VSC Set-up and Adjustment:
- 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.
- 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.
- Adjusting the VSC to come on at normal operating temperature is done as follows: Locate adjustment 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 3/4 turn!DO NOT FORCE ADJUSTMENT!
- 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.
The Variable Speed Control has new features:
When you set the on 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 185 ∞ F, then between 185∞ and 195∞ the fan speed will increase from 60% to 100%. So after a10∞ rise from the set point, the fans will be running at 100%.