The 2015 Jeep Grand Cherokee remains a popular SUV for its blend of comfort, style, and capability. However, even reliable vehicles face issues over time, and one problem that often catches owners off guard is blower motor relay failure. This small, inexpensive part plays a big role in your car’s climate control system. If the blower motor relay goes bad, your heater and air conditioning may stop working, leading to uncomfortable rides and potential safety issues, especially during extreme weather.
Understanding how the blower motor relay works and what to do if it fails can save you time, money, and stress. In this guide, you’ll learn how to spot symptoms, locate the relay, replace it, and avoid common mistakes many Jeep owners make.
What Is The Blower Motor Relay?
The blower motor relay is an electrical switch that controls the power to your Jeep’s blower motor. This motor pushes air through the HVAC (heating, ventilation, and air conditioning) system and into your cabin. The relay allows a small electrical signal from the climate controls to safely switch on the higher current needed by the blower motor.
Without the relay, direct wiring would mean running all the current through your dashboard controls, which isn’t practical or safe. The relay acts as a gatekeeper, protecting the rest of your system and ensuring reliable operation.
Common Signs Of A Faulty Relay
A failing blower motor relay can show up in several ways. Watch for these signs:
- No air from vents – The blower does not run at any fan speed.
- Intermittent operation – The fan works sometimes, then stops suddenly.
- Blower stuck on one speed – Usually stuck on high or low.
- Clicking sounds – You hear repeated clicks from under the dash, but no airflow.
- Burning smell – Overheating relay contacts may cause an odor.
Many drivers first notice the problem during the first cold day of the year, when the heater does not respond. Others find the issue when AC fails in summer.
Locating The Blower Motor Relay In Your 2015 Jeep Grand Cherokee
For the 2015 model, the blower motor relay is found in the interior fuse box, also called the Power Distribution Center (PDC). This box is under the dashboard on the passenger side.
To access it:
- Open the passenger door.
- Locate the kick panel under the glove box.
- Remove the panel to reveal the fuse and relay box.
- Use the diagram on the fuse box cover to identify the blower motor relay.
Here’s a quick comparison table showing the relay’s location in similar Jeep models:
| Model Year | Relay Location |
|---|---|
| 2013 | Interior fuse box (passenger side) |
| 2015 | Interior fuse box (passenger side) |
| 2017 | Engine compartment fuse box |
Knowing the exact location helps you avoid confusion and saves time during troubleshooting.
How To Replace The Blower Motor Relay
Replacing the relay is a straightforward task that most owners can do with basic tools. Here’s a step-by-step guide:
- Turn off the ignition and remove the key for safety.
- Disconnect the battery negative terminal to prevent shorts.
- Remove the kick panel and locate the relay.
- Pull out the old relay. You may need a relay puller or needle-nose pliers.
- Insert the new relay firmly into place.
- Reconnect the battery, replace the panel, and test the system.
Replacement relays cost between $10 and $30. Always use a quality part that matches your Jeep’s specifications.
Practical Tips For Blower Motor Relay Issues
- Double-check the fuse. A blown fuse can mimic relay failure.
- Test the blower motor. If a new relay does not solve the problem, the motor itself may be faulty.
- Inspect wiring and connectors. Corrosion or loose connections can cause intermittent operation.
- Keep spares. Carrying an extra relay in your glove box can be a lifesaver on long trips.
Here’s a comparison of symptoms to help you narrow down the problem:
| Symptom | Possible Cause | Solution |
|---|---|---|
| No airflow at all | Blown fuse, bad relay, bad motor | Check fuse, swap relay, test motor |
| Air only on high | Faulty blower resistor | Replace resistor |
| Intermittent airflow | Bad relay, loose wiring | Check relay and connectors |
Common Mistakes To Avoid
- Guessing without testing. Always check fuses and relays before replacing expensive parts.
- Using cheap aftermarket relays. Low-quality relays may fail quickly or cause electrical issues.
- Forgetting to disconnect the battery. Skipping this step risks a short circuit.
- Ignoring the blower resistor. If the fan works only on high, the resistor—not the relay—is often the problem.
Many owners overlook these simple checks and end up spending more money and time than necessary.
When To Seek Professional Help
If replacing the relay doesn’t fix your problem, or if you notice melted relay sockets or persistent electrical issues, it’s time to visit a qualified mechanic. Modern vehicles have complex electrical systems that sometimes need advanced diagnostic tools.
A professional can test the entire HVAC circuit, check for control module problems, and ensure safe, reliable repairs. For more technical information, you can check the official Jeep service manuals or visit the National Highway Traffic Safety Administration.
Frequently Asked Questions
What Does The Blower Motor Relay Do In A 2015 Jeep Grand Cherokee?
The blower motor relay acts as an electrical switch, allowing low-current dashboard controls to safely operate the high-current blower motor that runs the HVAC fan.
How Do I Know If My Blower Motor Relay Is Bad?
Common signs include no airflow, fan that works only sometimes, or a blower stuck at one speed. You may also hear clicking sounds or smell burning from the dash area.
Where Is The Blower Motor Relay Located In The 2015 Grand Cherokee?
It’s in the interior fuse box under the passenger-side dashboard. Remove the kick panel to access it, and check the diagram on the fuse box cover for the exact relay position.
Can I Drive My Jeep If The Blower Motor Relay Is Bad?
Yes, but you’ll have no heating or air conditioning, which can be uncomfortable and even unsafe in extreme weather. It’s best to repair the problem as soon as possible.
How Much Does It Cost To Fix A Blower Motor Relay?
Replacing the relay usually costs $10–$30 for the part. If you do it yourself, there’s little extra cost. A mechanic may charge $50–$100, including labor.
Solving blower motor relay problems in your 2015 Jeep Grand Cherokee is usually simple and inexpensive. Learning the basics can keep your ride comfortable and help you avoid costly mistakes.
