An electric fan can be used to keep an automobile's engine from overheating.
Older automobiles typically have a single, belt-driven fan that is used to move air through the radiator. If you have an older car and you need to drive it in stop-and-go traffic, this type of fan may be inadequate to prevent overheating. A secondary electric cooling fan can be installed to assist the cooling system. An electric fan installed in front of the radiator is referred to as a "pusher" fan while one installed on the engine side of a radiator is known as a "puller" fan.
Instructions
1. Attach the fan mounting clips to the fan's frame so that the clips face the radiator fins.
2. Place an automotive fan against the radiator so that the fan covers the center of the radiator and the wires from the fan are near the top of the radiator. If you are installing the fan in a "pusher" configuration, place the fan over the radiator on the radiator side that faces the automobile's grille. If you are installing the fan in a "puller" configuration, place the fan over the radiator on the radiator side that faces the engine. Press the fan frame against the radiator until the mounting clips snap into place.
3. Run a length of red electrical wire from the automobile's dashboard to the fan. Strip 1/2-inch of insulation from each end of this wire with wire strippers.
4. Drill a hole into the dashboard frame near the bottom of the dashboard. This hole must be large enough to accommodate the shaft of the toggle switch.
5. Place the dashboard end of the electrical wire against one of the electrical terminals on the switch. Use a soldering iron to melt a small drop of solder onto both the switch terminal and the wire end. Smooth out the soldered joint with the tip of the soldering iron. The soldered terminal should be shiny and free of lumps.
6. A small toggle switch can be used to control the fan.
Cut an 8-inch segment of red electrical wire and strip 1/2-inch of insulation from one end of this wire. Solder the stripped end of this wire to the unoccupied switch terminal. Loosen and remove the retaining nut on the switch shaft. Insert the switch shaft through the hole in the dashboard. Replace and tighten the retaining nut so that it holds the switch to the dashboard.
7. Place a Scotchlok connector over the automobile's ignition wire and seat the wire snugly into the channel at the bottom of the connector -- also known as the "run channel." Place the unstripped red wire from the switch into the hole on the side of the Scotchlok connector -- also known as the "tap hole" -- and push the wire in firmly until it stops. Use a pair of electrical pliers to drive down the metal U-contact until it is flush with the top of the plastic insulator. Close the top cover on the connector until it latches securely.
8. Run a red wire and two black wires from the fan to the battery. Strip 1/2-inch of insulation from both ends of each wire. Place the first spade terminal over the battery end of the first black wire and crimp the wire to the terminal. Place the second spade terminal over the battery end of the red wire and crimp the wire to the terminal. Place the third spade terminal over the battery end of the second black wire and crimp the wire to the terminal.
9. Each relay terminal is labeled with either a description or a terminal number.
Solder the fan end of the red battery wire to the "Normally Open" or "87" terminal on the relay. Solder the fan end of the switch to the "Coil 1" or "85" relay terminal. Solder the first black battery wire to the "Coil 2" or "86" relay terminal.
10. Place a Scotchlok connector over the second black battery wire and seat the wire snugly into the run channel. If you are using the fan in the "pusher" configuration, place the blue wire from the fan into the tap hole on the side of the Scotchlok connector and push the wire in firmly until it stops. If you are using the fan in the "puller" configuration, place the black wire from the fan into the tap hole on the side of the Scotchlok connector and push the wire in firmly until it stops. Drive down the metal U-contact until it is flush with the top of the connector's plastic insulator then close the top cover on the connector.
11. Cut an 8-inch piece of red wire and strip 1/2-inch of insulation from one end of the wire. Place the unstripped end of this wire into the run channel of an unused Scotchlok connector. Place the remaining wire from the fan into the connector's tap hole until the wire stops. Drive down the metal U-contact until it is flush with the connector's plastic insulator then close the top cover on the connector. Solder the end of the remaining wire to the "Common" or "30" terminal on the relay.
12. Use the adjustable wrench to loosen the adjustment nut on the positive battery terminal cable. Place the spade terminal connected to the red wire between the battery terminal cable and the nut. Tighten the nut so that the spade terminal is held tightly against the battery terminal cable.
13. Loosen the adjustment nut on the negative battery terminal cable with the adjustable wrench. Place the spade terminals connected to the black wires so that these terminals are held loosely between the battery terminal cable and the nut. Tighten the nut so that the spade terminals are held tightly against the .
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