The smell builds for a minute or two and then the fan slows and the cool breeze dwindles. Remove the electrical connector, retaining screws and the old resistor module. Take the fried one to an electric motor shop. A cooling fan assembly may come in different applications and may vary according to make, model, and engine type. If you have an older vehicle, you may need to look to the restoration market. It's time to chase voltages. Following that, it'll clean up and lube or replace the bushings, replace the brushes (which are usually a standard size) and button the whole thing up. The bearing on the fan end of the armature is accessible: Spin the armature shaft and hose it down with brake cleaner. Feel around the sides of the blade guards for clips that are holding the 2 parts together. The resistor was blown on our test car--we knew that for certain because the voltage was only meterable at the motor's hot terminal with the switch set to high. With the switch on a lower setting and the motor disconnected, you'll still see a full 12 volts of system voltage at even the lowest setting. The lives of these devices are unpredictable. As a leading retailer of aftermarket car parts, our goal is to give our customers the peace of mind to buy parts online. Noisy Fan. Learn about GPU fan size, connector type, mounting points, and fan design. Within seconds, the air begins to cool off, and so do you. Engine fan: Most vehicles today have a thermostatically controlled electric fan that comes on when additional engine cooling is necessary. FOLLOW US: Popular Mechanics is Now on Twitter! When this resistor dies, the fan will no longer work at certain speeds. A fan constantly turning full-chat is noisy, and unnecessary a lot of the time. You've been warned. Should You Warm Up Your Car When It's Cold? What's going on? BBB Rating: A+ Website. Driving without air conditioning or the heater can make for an uncomfortable trip. Unfortunately, there is often enough headroom in a fuse's rating to let the motor melt before the fuse pops, if it blows at all. The other end of the armature is usually inaccessible. A likely cause for a busted AC or heating unit is a damaged blower-motor. Get an estimate instantly. Last resort: junkyard parts. PLUS: Seven Summertime Auto Myths Debunked, JAY LENO'S GARAGE: 3D Printer Replaces Rusty Old Parts. If there are clips, unhook them and remove the front half. The resistor is usually inexpensive ($10 to $15) and easy to swap out. When the cooling fan motor is replaced, the cooling fan blade should also be inspected. The shop will also true up the commutator on a lathe and undercut the copper contacts. Our spent motor was completely open electrically, and wouldn't load down the circuit at all, even after we replaced the resistor. If both hot and ground wires are still attached to the motor's frame, back-probe the hot wire to the motor armature with the key on and the fan-speed switch set to high. It's not impossible for these wires to be knocked loose by the errant toe of a boot or a suicidal Barbie doll lurking on the floor. Resistor module replacement. If the fan spins readily, the problem is usually electrical. Be sure not to damage the plastic fan. Response must be less that 100,000 characters. If your old motor came with any sound insulation, replace that too. If it's blown, don't replace it now, because there's a good chance the new one may blow immediately too. But there’s one accessory that can be really useful, but we almost never think about it -- a stroller fan. Heating systems consist of a heater core, a heater fan, the car’s coolant system, and your HVAC controls. Follow up with oil--a few drops of LPS 3 (my personal favorite) or even motor oil. This is why you need to shop at AutoZone for a quality replacement. If the fan motor on my car was dead, I'd probably go ahead and change the resistor while I had my head under the dash. Know Your Stuff: The 110 Best DIY Tips Ever, 5 Pro Painting Tips Every Amateur Should Know: DIY Guy, Build This Cardboard Throwing Star, Become a DIY Ninja, Backyard Geniuses: 10 Incredibly Cool DIY Projects, How to Build a Backyard Pergola: Simple DIY Woodworking Project. A broken fan motor can make your air conditioner useless and your ride miserable. After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in. 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