How to replace a blower motor resistor thermal fuse?

Blower Motor Resistor Thermal Fuse Replacement 1 Order the Correct Fuse. The part I ordered is from NTE Electronics. 2 Remove Old Fuse. Now the instructions say to use the crimps and only make mechanical connections. 3 Continue Removal. 4 Tin. 5 Solder the Crimps. 6 Add the Fuse. 7 Rinse and Repeat. 8 Another Shot

How does a blower motor resistor pack work?

The way the resistor pack does this is by shortening or lengthening the circuit through the coils to add or subtract the amount of resistance it takes to get the speed you want. So naturally, three speeds, four pins.

Where does the ground go on a blower motor?

The way this circuit works is all on the ground side. 12 volts is always present at the motor, and the switch in your dash provides the ground. On speeds 1-3 the ground is re-routed through the resistor pack and on high speed it bypasses the resistor pack and the motor gets full voltage.

What causes a blower motor to heat up?

Heat either caused by poor airflow across the resistor pack resulting in poor cooling, or heat caused by a higher amperage draw from a worn out motor with poor lubricated bearings/bushings or worn brushes. If the motor was serviceable, that would be the next route I would take.

How to replace a resistor on a blower motor?

Check Voltage and Ground at the motor. Check. Relay click. Check Switch check. Check So we decided that maybe the plug-in that goes to the resistor pack was corroded just enough to block current from going through it.

How to replace a fuse on a blower motor?

Use a die grinder or equivalent to remove the original crimps down to where the lead breaks in two and the fuse will fall off. Use the pointy end of the grinder bit to just carefully drill the rest of the material out and take a bit of the galvanized surface down to clean metal. I suppose you could use a small drill bit for this step too.

What to do if your heater fan stops working?

The heater fan in a 98 Ford Explorer stopped working completely for my friend. He bought a replacement fan and all was good for about two weeks. Then the fan stopped working on all speeds except “high.” He bought a replacement resistor pack from an aftermarket company. I won’t mention any names but its a major auto parts store.

What’s the rating of the thermal fuse on a Ford blower?

Odds are it has a few numbers on it and a rating. (Thanks google) Here’s another tid bit. The original Ford part that I was looking at had a Thermal Fuse with a 121 degrees C. The replacement part had a fuse with the rating 113 degrees C.

What causes a fuse to blow on a blower motor?

If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

When do you need to replace the blower motor relay?

If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay. 1. Blower motor does not function 2. Blown fuses 3. Melted relay The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor.

What happens if you have a bad blower motor?

The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air.

Why are the vents not working on my Chevy Trailblazer?

When I reconnected the battery the AC controller recalibrated itself and everything worked fine. Later I replaced the car’s (05 Trailblazer) battery and the top vents quit working. According to the schematics I had, this was due to the mode control door not working right.

What are the symptoms of a failed blower motor resistor?

Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn’t work at low speeds.

How much does a blower motor resistor cost?

Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com. The replacement parts come in individual units, sets of two resistors, or as part of a blower motor resistor kit.

What to do if your blower resistor Burns?

Look for obvious signs of corrosion and burns from overheating. If you see signs of overheated connectors, replace the blower resistor and its connector, but again, you must splice the wires right, or you’ll have problems at the splice later on.

How does a blower motor resistor control the fan speed?

The blower motor resistor controls the fan speed of the blower motor and the resulting change in air pressure produced by the movement of the blower fan. It accomplishes this by regulating the electric current that powers the motor.

Where does the power go in a blower motor?

For each higher speed, power flows through one less resistor. Some car makers run blower motor power through the fan speed switch first, then through the blower motor resistor and then to the blower motor and ground. Other car makers reverse that and run power to the blower motor first and terminate ground at the blower fan speed switch.

How to fix blower resistor on Ford F150?

FORD F150 BLOWER RESISTOR 1997-2003 FIX! Only blows on high – $20 (Short version) – MECHANICAL KID – YouTube FORD F150 BLOWER RESISTOR 1997-2003 FIX! Only blows on high – $20 (Short version) – MECHANICAL KID If playback doesn’t begin shortly, try restarting your device.

Why does my Ford F-150 blower only blow on high?

Please try again later. If your 1997-2003 Ford F-150 A/C – heater fan only blows on high or doesn’t blow at the lower speeds, you most likely have a failed blower motor resistor. You could pay up to $400 to have a shop or the dealer replace it for you but you can do it yourself for as little as $20!

How much does it cost to replace a fan resistor on a 1997 Ford F-150?

This feature is not available right now. Please try again later. If your 1997-2003 Ford F-150 A/C – heater fan only blows on high or doesn’t blow at the lower speeds, you most likely have a failed blower motor resistor. You could pay up to $400 to have a shop or the dealer replace it for you but you can do it yourself for as little as $20!

Where is the blower motor resistor located on a Ford Escape?

In the 2008-2011 Ford Escape, the resistor is located behind the glove box on top of the HVAC unit air duct. It’s held by two screws and is easy to replace. See the photo. In the 2008-2011 Ford F150 the blower motor resistor is also located behind the glove box, but is installed in the right side of the plastic air duct.

Can a faulty heater resistor be a thermal fuse?

If you have diagnosed a faulty heater resistor (not the electronic kind), looking roughly similar to the one shown here, it’s most likely just the thermal fuse that has blown. Replacing the fuse is cheap and easy.

Where is the blower motor relay on a Nissan Xtrail?

Expert: indy-tech replied 6 years ago. Behind the drivers side fascia under the dash nesr your nees you will find a relay box with three relays, one is the blower motor relay . Replace and try the blower motor, if this is okay then suspect the blower motor switch .

What does it mean when a blower motor resistor fails?

In our case the ohmmeter shows open circuit, which means the resistor has failed. Sometimes, a blower motor resistor might fail due to problems with the blower motor itself. This means after replacing the blower motor resistor, check if the blower motor runs freely and doesn’t make any noise.

How to replace a blower motor resistor thermal fuse?