Resolved: Fixing 7 Common Jeep Wrangler Blower Motor Issues

Jeep Wrangler’s blower motor plays a crucial role in maintaining a comfortable and well-ventilated cabin, making it an indispensable component of your driving experience. If you’ve found yourself in the predicament of a silent blower motor, it’s essential to address the issue promptly.

A Jeep Wrangler’s blower motor stops working due to various reasons, such as a blown fuse, faulty relay, malfunctioning resistor, poor wiring harness, or a defective climate control unit. Regular maintenance and inspections can prevent such issues, ensuring optimal performance during your drives.

In this guide, I’ll explore the significance of a functional blower motor and dive into seven common reasons why it might not be working.

Basic Functionality of the Blower Motor:

Let’s dive into the heart of your Jeep Wrangler’s ventilation, heating, and air conditioning system: the blower motor. This component might sound technical, but its function is pretty straightforward. 

The blower motor is essentially the fan behind your dash that pushes air through the vents. Whether it's a cold winter day and you need some warmth or a sweltering summer afternoon begging for a breeze, the blower motor ensures that you're always in control of the cabin's temperature and comfort.

Now, if you’re running the system, the blower motor’s role starts once you toggle the fan switch. Depending on your desired fan speed, it spins at different rates. 

Connected directly to the HVAC system, it draws air through the A/C evaporator (if you’re gunning for some cool air) or the heater core (if you’re chasing warmth) and then pushes that treated air into the cabin.

So, in essence, the blower motor is your personal climate hero, always there to ensure you ride in comfort.

Common Causes for Jeep Wrangler Blower Malfunction:

1. Issue due to Blown Fuse:

If you’ve been around the block (or the trail) a few times, you might’ve heard fuses blowing and causing trouble in our beloved Wranglers. 

One such issue? Your blower motor is ceasing to function. Now, before you start thinking of shelling out big bucks for a complete overhaul, let me dive into the details.

The proper functioning of the AC blower motor in the Jeep Wrangler relies on an electrical power supply. If there’s an issue causing too much current to flow towards the blower motor, the fuse designated for it will blow, stopping the motor to save it from potential damage.

How to Fix:

To check if the fuse is blown, carefully remove it from the fuse box using a fuse puller or needle nose pliers and examine it against a light source. These fuses are often tiny, color-coded plastic rectangles with metal caps on both ends. If the metal strip inside the fuse appears broken in the middle, it indicates it has blown.

Replacing it with a new fuse of the same amperage and corresponding color is crucial. The orientation in which you insert the fuse does not matter.

The Rear Blower Motor/Radiator Fan Fuse is located in Cavity J12, uses a 30 Amp Pink Cartridge Fuse, and is described as "30 Amp Pink".

You can seek help from a mechanic or an automobile expert to replace the blown fuse in the Jeep Wrangler.

2. Issue Due to a Malfunctioned Relay:

The relay is essentially an electrical switch that opens or closes circuits based on specific inputs. In the context of your Jeep’s blower motor, the relay acts as the go-between for the motor and the control switch. 

When you turn on the heat or air conditioning, the control sends a low current signal to the relay, which then closes the circuit, allowing a higher current to flow to the blower motor. This is what turns on the fan and provides you with air circulation in the cabin.

If the relay malfunctions, it can interrupt this circuit, preventing the blower motor from receiving the necessary power. This means no air circulation, regardless of how much you fiddle with the controls.

Identifying a Faulty Relay:

• Inconsistent Operation:

 One of the first signs of a malfunctioning relay is when the blower motor works intermittently. It might work perfectly one moment and then suddenly stop the next, even though the control is still set to ‘ON’.

• No Operation: 

In more severe cases, the blower motor won’t turn on at all. Before jumping to conclusions, it’s always a good idea to check other potential issues like blown fuses or a faulty motor itself.

• Audible Clicking: 

Sometimes, if you listen closely, you can hear a faint clicking sound when you try to turn on the blower. This can indicate that the relay is trying to work but failing to close the circuit.

How to Fix:

• STEP 1- Locate the Relay:

Begin by identifying the relay’s location. Typically, the blower motor relay is situated in the fuse box. This could be either under the hood or inside your Jeep’s cabin. For precise location details, refer to your vehicle’s owner’s manual.

• STEP 2- Visual Inspection:

Before diving deeper, visually inspect the relay. Look for signs of damage, wear, or corrosion. Sometimes, a relay malfunction is due to accumulated dirt or corrosion, which can be easily cleaned.

• STEP 3- Test the Relay:

To ensure the relay is the root of the problem, you’ll want to test it. Using a multimeter, connect it to the relay’s terminals. Turn on the blower motor switch. A functioning relay will show an electrical current on the multimeter. If there’s no reading, your relay is likely defective.

• STEP 4- Replacement:

If the relay is determined to be faulty, it’s time to replace it.

Do remember:

• To test the relay, consider swapping it with other relays in the fuse box with a similar amp rating.
• However, before you proceed with the replacement, it is essential to disconnect the vehicle’s battery for safety purposes.

3. Issue Due to Malfunctioned Resistor:

The blower motor resistor in your Jeep Wrangler serves the critical function of regulating the blower motor’s speed.

When you adjust the AC fan speed in your vehicle, the climate control unit communicates with the resistor module to either increase or decrease the flow of electric current to the blower motor accordingly.

If a fault arises in the resistor module, it can lead to the blower motor’s failure and result in it not functioning properly.

Causes for Failing of Resistor:

There are different reasons why the resistor fails in the Wrangler, leading to the inappropriate working of the blower motor. The resistor in the vehicle is responsible for the motor’s working, which places a lot of stress on it and causes overheating.

This excess heat production can lead to the burning of the resistor. There are still chances that the blower motor in the Wrangler will work properly even in the presence of a bad resistor.

Common symptoms of a faulty resistor include:

• The fan only works at certain speeds.
• The fan is not working at all.
• Inconsistent speeds of the fan.

How to Fix:

Typically, you can find the resistor located beneath the passenger side dashboard, in close proximity to the blower motor. This positioning facilitates its role in controlling the blower motor’s speed and ensures efficient climate control within the vehicle.

If you detect a problem with the resistor, you can replace it with a new one to deal with the issue of a blown motor. You can test the working of the resistor for the blower motor through various means. One of the most used methods is checking the amount of voltage using a multimeter.

You can follow this procedure to rule out the problems with the fuse or relays in the Wrangler:

• STEP 1- The first step is locating the area of the blower motor in the vehicle, which is mostly present near the dashboard.
  
• STEP 2- The next step is removing the motor’s electrical connectors.
  
• STEP 3- Now, connect the multimeter to the probes of the connector. Ensure the metal part does not come in contact with the probes.
  
• STEP 4- Check that the blower motor receives enough current to work. You can also choose the test light method to check which fuse will blow up.
  
• STEP 5- Turn the AC fan in your vehicle and note down the readings on the voltmeter, which must be around 12 volts.
  
• STEP 6- If no volt readings are detected on the voltmeter screen, the problem can be due to a poor resistor in the vehicle. But, if the readings on the volt are normal, then the indicated problem is due to a blower motor.

4. Issue Due to a Failed Blower Motor:

Blower motors in Jeep Wranglers may encounter unexpected failures without warning but often exhibit early signs before completely stopping.

Some of the most common indications of a failing blower motor include:

• Unusual Whirring Noises: When the air conditioner operates, you may hear abnormal whirring noises from behind the dashboard. These sounds can indicate issues with the blower motor’s bearings or other internal components.
• Weak or Inconsistent Airflow: If you notice that the airflow from the AC vents becomes weak or inconsistent, it could be a sign of a blower motor problem. The motor’s reduced efficiency can result in inadequate air circulation.
• Burning Plastic Odor or Smoke: In rare cases, a failing blower motor might produce a burning plastic odor or even emit smoke from the AC vents, particularly when the fan speed is too high. This could suggest overheating or electrical issues within the motor.

Attention to these early warning signs can help you promptly address blower motor issues and prevent complete failure, ensuring a well-functioning air conditioning system in your Jeep Wrangler.

How to Fix:

You can test the problem in the blower motor through the following steps:

• STEP 1- The first step is to unplug the electrical connectors from the motor and turn the multimeter on.
• STEP 2- Next is the insertion of probes in the connector side. It is recommended to ensure that the metal part does not come in contact with each other. At this moment, you can also use a test light to check the current flow.
• STEP 3- After checking, turn the AC fan in the vehicle and note down the readings on the multimeter, which should be around 12 volts. But, if the readings are normal, the problem is due to the presence of a blower motor.

5. Issue Due to Poor Wiring Harness:

In the Jeep Wrangler, various issues with connectors and wires can lead to interruptions in the power supply to the blower motor failing.

The wiring harness ensures the motor receives power from the battery and follows commands from the controls. A malfunction here can disrupt that harmony, leading to a non-functioning blower motor.

These potential causes include:

• Bad Connector on the Blower Motor or Resistor Module: If there’s a fault in the connector linking the blower motor or the resistor module to the electrical system, it can disrupt the flow of power to the blower motor, leading to its malfunction.
• Bad Connector on the Climate Control Unit: The climate control unit’s connector is vital in transmitting signals to the blower motor. A malfunctioning connector here can impede the proper functioning of the blower motor.
• Damaged Wire in the Circuit: A damaged wire within the blower motor circuit, including the wire originating from the fuse box, can cause interruptions in the electrical current flow, resulting in the blower motor’s failure.

Signs of a Faulty Wiring Harness:

• Intermittent blower function: The blower might sometimes work and suddenly stop or at inconsistent speeds.
• Visible damage: Upon inspection, you might notice frayed wires, melted plastic coverings, or other visible signs of wear and tear.
• Strange noises or smells: A burning smell or a sizzling sound could indicate a short in the wiring.

How to Fix:

Identifying and promptly addressing issues with connectors and wires can help prevent blower motor problems and ensure a properly working air conditioning system in your Jeep Wrangler.

Regular maintenance and inspections can aid in detecting and resolving these potential problems early on.

6. Issue Due to Faulty Climate Control Unit:

The climate control module serves as the central control unit for the air-conditioning system in your Jeep Wrangler. It plays a crucial role in activating and regulating the blower motor’s speed.

It is more than just dials and buttons. It’s a complex system that dictates how much hot or cold air gets dispersed inside the vehicle. 

When it’s not communicating correctly, it can result in a blower motor that either doesn’t function or isn’t operating optimally.

Recognizing the Issue:

• Unresponsive Controls: No matter how you adjust the dials or press buttons, there’s no change in the airflow or temperature.
• Random Operations: The blower might have a mind of its own, working at inconsistent speeds or turning on/off unexpectedly.
• No Display or Faulty Readings: For digital systems, the display might be blank, or it might give readings that don’t match the actual settings.

As the brain of the air-conditioning system, the climate control module's role is to receive input from the vehicle's occupants and sensors. Then, it processes this information to adjust the temperature, fan speed, and airflow to maintain the desired climate inside the vehicle.

Any malfunctions in this control unit can impact the blower motor’s performance and overall air-conditioning system operation.

How to Fix:

• STEP 1- Reset the System:

Before diving deep, try the simplest fix. Turn off your Jeep, remove the key, and wait a few minutes. Sometimes, this soft reset can help the system recalibrate itself.

• STEP 2- Check for Loose Connections:

Gently pull out the climate control unit and inspect for any loose or disconnected wiring. A simple reconnection can sometimes do the trick.

• STEP 3- Test with Another Unit:

If you can access another functioning climate control unit (perhaps from a fellow Jeeper or a spare), replace yours temporarily to see if the blower motor starts working. This can help pinpoint if the problem truly lies with the climate control unit.

• STEP 4- Clean the Unit:

Dust and debris can sometimes affect functionality. Use compressed air to clean the back and inside of the unit gently. Ensure all connections are clean and free of corrosion.

• STEP 5- Replace the Faulty Climate Control Unit:

If you’ve deduced that the climate control unit is the culprit, it might be time for a replacement. While you can procure the part and replace it (especially if you’re handy and familiar with the Jeep’s interiors), you might also consider installing it professionally to ensure optimal functionality.

• STEP 6- Update Software (for Modern Jeeps):

Some of the newer Wrangler models come with advanced climate control units that operate based on software. Checking for software updates and ensuring your system runs the latest version can sometimes resolve glitches.

7. Issue Due to a Faulty Control Module:

The control module also plays a vital role in the effective functioning of the blower motor of the Jeep Wrangler.

If the control module of the vehicle is malfunctioned, it might cause problems in running the vehicle's blower motor. Hence, it is essential to check the control module if issues with the vehicle's blower motor occur.

How to Fix:

It is recommended to inspect the control module thoroughly and to detect the root cause that is causing issues with the blower motor.

You can seek professional help from an automobile expert to deal with the problem with the control module, as it is impossible to fix it in an expert way at home.

Average Cost for Replacing the Blower Motor in a Jeep Wrangler:

Here, I’ll break down the costs associated with replacing a Jeep Wrangler blower motor and provide insight into the process.

Cost Components:

• Blower Motor Price:

The cost of the actual blower motor component typically hovers around $300, with prices quoted as $308 being common. These parts ensure the vehicle’s interior remains comfortable regardless of external conditions.

• Labor Expenses:

The mechanics’ efforts account for labor costs, which are estimated to be between $72 and $91. It’s essential to remember that this rate can fluctuate based on where you live and the specific model of your Jeep.

Combining the parts and labor, the average cost of replacing a Jeep Wrangler blower motor lies between $380 and $399. However, it's always a good idea to check your region's prices as they vary.

How It Compares:

• Replacing a blower motor is generally pricier than fixing or changing a fuse, relay, or resistor.
• Although the replacement seems costly, the procedure is relatively straightforward for experienced mechanics.
• Always consider carrying the old blower motor when purchasing a new one to ensure a perfect match.

Symptoms of a Faulty Blower Motor in Jeep Wrangler:

• No Airflow: The most obvious symptom is turning on the heater or air conditioner, and no air comes out of the vents. Even if you adjust the fan speed, the blower motor doesn’t respond.

• Unusual Noises: If you hear squeaking, squealing, or grinding sounds when you turn on the blower, it’s a good indication that the motor is nearing the end of its lifespan or has already failed
• Only Works on Certain Speeds: If the blower motor only functions at certain speeds or stops working at specific settings, it’s often a sign of a worn-out resistor; however, the blower motor can sometimes be the culprit.

• Fuses Keep Blowing: While other electrical problems can cause a blown fuse, a malfunctioning blower motor can draw excess current, leading to this issue.

• Blower Motor Doesn’t Turn Off: In some cases, a faulty relay or switch can cause the blower motor to keep running even when the vehicle is turned off.

• Reduced Airflow: Even if the blower motor doesn’t stop entirely, it might not push air as effectively as before. You might notice weaker airflow despite having the fan in its highest setting.

• Unpleasant Smell: If the motor overheats, it can produce a distinct burning odor. This smell might waft through the vents and is a clear sign of a malfunctioning blower motor.

• Hot or Overheating Components: Touching the blower motor housing and finding it excessively hot to the touch can be a warning sign. Overheating can be a precursor to failure.

• Decreased Fuel Efficiency: Though this is more of an indirect symptom, a struggling blower motor can burden the electrical system, potentially leading to reduced fuel efficiency.

• Visible Damage or Wear: On inspecting the blower motor, if you notice physical damage, frayed wiring, or other signs of wear, it clearly indicates a problem.

How long do Jeep Wrangler AC blower motors last?

AC blower motors are engineered to have a considerable lifespan, typically serving a vehicle efficiently for between 12 to 15 years. However, with rigorous maintenance and under optimal conditions, these motors can extend their operational life up to 18 years. 

It’s noteworthy that the longevity of a blower motor can oscillate based on the specific make and model of the vehicle. Furthermore, the environmental conditions in which the vehicle operates play a crucial role in determining the motor’s lifespan. 

For instance, if a vehicle is frequently driven in areas inundated with dust or dirt, the blower motor might experience accelerated wear and tear, leading to a diminished operational period.

Final Thought:

A non-functioning blower motor in your Jeep Wrangler can significantly impact your driving comfort and safety. From fuses to wiring harnesses and the blower motor itself, there are several potential culprits.

It’s essential to diagnose the issue promptly and address it, ensuring that your Wrangler remains reliable and up to any adventure. Always consider professional advice or service when in doubt to keep your Jeep in top condition.

Also Read:

7 Reasons Jeep Wrangler Cruise Control Stops Working (Fixed)
12 Symptoms to Know If Your Jeep Transmission is Bad
Are Jeep Wranglers Good in Winter/Snow? (Detailed Analysis)
Jeep Wrangler Automatic Transmission Shifting Problems (Fix)
Top 8 Lift Kits for Jeep Wrangler- Detailed Analysis
How to Reset Throttle Body on Jeep Patriot? Step Wise Guide

Frequently Asked Questions (FAQs):

What are the reasons why the blower motor stops working?

There are different reasons why the blower motor stops working, including:

• Presence of clogged air filters
• Improper supply of voltage
• Fault with the switch
• The presence of worn-out wires and capacitor

You can test the capacity of your switch using a multimeter. If the issue is due to wiring and coils, you can clean the blower motor and deal with the problems with wires. If the motor is still not working, then replacing it with a new one is recommended.

Why does the air stop blowing in the Jeep?

There are different reasons why air stops blowing in the Jeep, including:

• Leak from the refrigerator
• Issues with climate control
• Problems with the air condition

Which conditions are seen when the blower motor stops working?

When the blower motor stops working in the vehicle, there are some symptoms shown by the vehicle, including:

• No movement of air from the system
• Freezing of evaporator coil
• Damage to the compressor

After all these symptoms, the AC in the vehicle stops blowing the cool air, which can be repaired.

Is a faulty fuse considered an issue for the non-working of the blower motor?

When a blower motor fails to blow away air while turning the heater of an AC, the causes can be due to:

• Presence of a damaged control switch
• Presence of a faulty control module
• Presence of a damaged resistor block
• The presence of a faulty relay or fuse