2011-2018 Ram 1500 Blower Motor Resistor: A Comprehensive Guide
If your truck's fan only works on high or not at all, this guide is for you.
- The most common symptom of failure is the fan only working on the highest speed setting.
- Replacement is an easy DIY job, typically taking less than 30 minutes with basic tools.
- Always inspect the wiring connector for melting or damage, as this is a common failure point.
- Verify if your truck has manual or automatic climate control before buying, as the parts are different.
Is Your Ram's Blower Motor Resistor Failing?
A faulty blower motor resistor in a 2011-2018 Ram 1500 will produce very specific and annoying symptoms. The most common sign is when your fan only works on the highest setting. This happens because the high setting bypasses the resistor entirely, sending full power directly to the blower motor. 🎬 Watch this guide on how to test and replace your resistor. Other symptoms include certain fan speeds not working, no airflow from the vents at all, or inconsistent fan speeds that change on their own. In some cases, you might even smell burning plastic from the vents as the resistor overheats.
Check the Connector!
A common point of failure is not just the resistor itself, but the wiring connector attached to it. Overheating can melt the connector and cause a poor connection. When you replace the resistor, always inspect the connector for signs of melting, browning, or corrosion. If it's damaged, you should replace it to prevent the new resistor from failing prematurely. Some aftermarket kits include a new connector pigtail for this reason.
Choosing a New Aftermarket Resistor
When it comes to replacing the blower motor resistor, you have a choice between OEM (Mopar) and aftermarket parts. For a simple component like this, an aftermarket part is often a very practical and cost-effective solution.
- OEM (Mopar): Genuine Mopar parts are a guaranteed fit and are made to the original specifications. However, they are the most expensive option. Some owners on forums insist on OEM to avoid potential issues with aftermarket parts, like incorrect fan speeds or premature failure.
- Aftermarket (Replacement): Brands like Dorman, Standard Motor Products (SMP), and other "Replacement" tier parts offer significant cost savings. For many Ram owners, a quality aftermarket resistor works perfectly and provides a reliable, long-lasting repair. Given the low price and easy installation, an aftermarket resistor is a smart choice for a DIY repair.
Pro Tip: Manual vs. Automatic Climate Control
Your 2011-2018 Ram 1500 could have either manual or automatic temperature controls (ATC). These systems use different blower motor resistors. The part for manual controls is typically a simple resistor block, while the part for ATC is often called a "blower motor control module" or "power module". Always verify which system your truck has before ordering to ensure you get the correct part.
Cost of Replacing a Blower Motor Resistor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Part | $24.85 |
| New OEM (Mopar) Part | $65 - $96 |
| Shop Labor Cost | $52 - $77 |
| Total Professional Replacement | $145 - $197 |
Frequently Asked Questions
Where is the blower motor resistor located on a 2011-2018 Ram 1500?
The blower motor resistor is located in the passenger-side footwell, typically mounted to the HVAC housing near the blower motor itself. You can access it by looking up from under the glove box area. It is held in place by two screws and has an electrical connector plugged into it.
Is replacing the blower motor resistor a difficult job?
No, this is considered an easy DIY repair. The difficulty is rated 1 out of 5. It typically requires only a Phillips or 8mm screwdriver and can be completed in under 30 minutes. 🎬 Watch: A step-by-step walkthrough of the resistor replacement process. You simply disconnect the battery, unplug the electrical connector, remove two screws, swap the part, and reinstall everything.
Should I replace the blower motor at the same time?
Not necessarily. A failing blower motor can draw too much electrical current, causing the resistor to overheat and fail. If you have replaced the resistor multiple times, the blower motor is likely the root cause. Symptoms of a bad blower motor include squealing or grinding noises. If you only have the classic "fan works only on high" symptom with no strange noises, you likely only need to replace the resistor.
🎬 See how to troubleshoot and swap out the blower motor.Why do my aftermarket resistors keep failing?
There are two common reasons for repeat failures. First, a failing blower motor is drawing too much current and burning out the new resistor. Second, a poor connection at the wiring harness plug can create high resistance and heat, melting the connector and causing the new part to fail. Always inspect the connector and consider replacing the blower motor if you're on your second or third resistor.
Helpful Videos
Technical Specifications
OEM Part Numbers: 68048900AA 68048900AB 68048901AA
Varies based on whether the vehicle has manual or automatic temperature controls. The manual version is a resistor block with a 4-pin connector. The automatic version is a solid-state power module.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Ram 1500: