Ford 2-Speed Fan
But before the wiring can begin the charging system will need to be upgraded. The stock 75amp alternator will not be able to handle the added load of the new fan, especially after we saw how much air it can pull.
These fans can be found on Taurus, Contour, Town Car, Grand Marquis, LTD, Windstar, Escort and many
others use the same.
An alternative to aftermarket electric fan kits is a junkyard fan. It is a Ford 8C607 fan. It comes in the 90 to 95 Ford Taurus and Lincoln Mark VIII with the 3.8 litre engine. 1995 Mercury Tracer has a similar fan. It is a two speed fan with integral shroud and a low-profile electric motor. The Taurus fan pulls around 40 amps using the high-speed wire.
You may need to modify the
intergrated shroud and trim off small portions until it fits in place. And then drill some
holes in the shroud to bolt the unit in place.
- The fans can be acquired from a local junkyard
- 2 continuous 85 amp relays from Napa
Auto Parts (NAPA Part# ST85)
- The fan controller – Imperial/Hayden
226204. Hayden/Imperial electronic fan controller (PN:3647)
- 75 amp rated Bosch relay (0 332 002 156)
The Taurus fan is 16 inches blade tip to blade tip. The T-bird fan is 18 inches blade tip to tip. Note that both fans
are from similar year cars with the same size engine.
FREE WHEELING DIODE -Since the motor is an inductive load and an inductor is an energy storage device, when the contacts of the relay open, the energy that is stored in the motor has no place to go. The voltage increases (negatively) and a spark is created across the relay contacts, greatly reducing the contact service life. If a diode is placed (reverse biased) across the motor, it will not conduct in normal operation but will conduct when the relay contacts are opened, thereby suppressing the spark. The current is said to freewheel through the diode and the motor after the supply current from the battery is interrupted. This voltage spike can get unbelievably high, hundreds of volts for a 12V system. Use a 1N5404 which is rated at 3A, 400PIV.
Created: February 5, 2005 / Last Updated: February 5, 2005