Auto Spotlight

  • headlights
    Change a Headlight Bulb in 4 Steps
    Military.com
    You can have the fanciest wheels but it won't matter much if your headlights aren't working -- here's how to replace old bulbs ...

Most Popular in Autos

  • headlights
    Change a Headlight Bulb in 4 Steps
    Military.com
    You can have the fanciest wheels but it won't matter much if your headlights aren't working -- here's how to replace old bulbs ...
  • Car mechanic repairing the underside of the car.
    Auto Repair: Jump-Starting Diesel Batteries
    Military.com
    Although diesel vehicles can have dual or oversized batteries, it's possible to jump a diesel with a conventional gas vehicle.
  • Shipping Your Car Overseas (POV)
    Shipping Your Vehicle Overseas
    Military.com|
    if you're keen on taking your car with you to your new duty station, or bought a POV overseas while stationed there and want to...

Auto Discounts

Auto Repair: The Fan

Two men repairing an engine in a garage.

The Fan

Air rushing through the radiator cools things off when you're driving merrily down the highway, but a fresh supply of air doesn't move through the radiator fins when the vehicle is standing still or crawling its way through heavy traffic. For this purpose, the fan is positioned so that it cools the liquid in the radiator (refer to Figure 11-1). Today, most fans have a plastic shroud that funnels air through the radiator. Some vehicles have air dams that help force the air up through the radiator from below.

Car Smarts: Originally, the fan operated in connection with the water pump, and they were both driven by a single fan belt that ran around a pulley connected to the alternator. This fan belt drove the fan as long as the engine was running. Almost all fans today are electric and thermostat-controlled, not hooked by belts to the engine or water pump. These fans only come on when they need to. Because the air rushing past them allows these fans to simply "coast" at high speeds, the engine doesn't have to work as hard or burn as much fuel to supply the power that the fans would normally consume.

Some vehicles now have two fans because styling changes that have lowered the profile of the hood area have caused radiators to get lower and longer, meaning that a single fan doesn't cover the entire surface. These two fans are sometimes run by electric thermostats that aren't connected to the water pump at all.

From Auto Repair for Dummies, copyright © 2009 by Wiley Publishing, Inc., Indianapolis, Indiana. Used by arrangement with John Wiley & Sons, Inc.

Related Topics

Autos

Military News App by Military.com

Download the new Military.com News App for Android on Google Play or for Apple devices on iTunes!

© 2016 Military Advantage