Ford Explorer Transmission Oil Cooler Guide (2012-2019)
Keep your 2012-2019 Ford Explorer's transmission safe by understanding its oil cooler.
- The most common failure is a fluid leak, so check for red or brown spots under the front of your Explorer.
- For this vehicle, a quality aftermarket cooler from a brand like Hayden or Derale is a cost-effective alternative to OEM.
- If you replace the cooler, it's the perfect time to also change the MERCON LV transmission fluid to prolong transmission life.
- Do not drive if the transmission is overheating or slipping; you risk destroying the entire transmission.
Is Your Explorer's Transmission Cooler Failing?
A problem with your transmission cooler can lead to big trouble for your 6-speed 6F35 or 6F55 automatic transmission. The most common issue is leaks. You might see reddish or brown fluid on the ground under the front of your vehicle. These leaks can happen because of physical damage, corrosion, or failed line fittings. Another serious issue, though less common, is when the cooler fails internally and allows transmission fluid to mix with your engine's coolant. This creates a sludgy, milkshake-like fluid that can destroy both your transmission and your radiator.
Key Failure Symptoms
🎬 Watch this video to learn more about transmission cooler symptoms.- Transmission Overheating: A warning light on your dash or the vehicle going into a reduced-power "limp mode" are serious signs.
- Fluid Leaks: Puddles of red or brown fluid under your Explorer are a clear sign of a leak.
- Poor Shifting: If the transmission is slipping, hesitating, or shifting harshly, it could be due to low fluid levels or fluid that's been damaged by heat.
- Burnt Smell: A burning smell indicates the transmission fluid is too hot and is breaking down.
Known Issues, TSBs, and Recalls
While most of the highly publicized transmission cooler issues, recalls (like Customer Satisfaction Program 20B34 🎬 See why the 2020 Explorer transmission cooler was so problematic.), and Technical Service Bulletins (TSBs) were for the 2020 model year and newer Explorers, the principles are the same. These newer models had problems with cracks forming near the cooler line fittings, leading to fluid loss. Owners of 2012-2019 models should still be vigilant for leaks, as corrosion and age can cause similar failures on the original coolers.
Choosing a New Aftermarket Cooler
When your original cooler fails, you have a choice between an OEM (Original Equipment Manufacturer) part from Ford and an aftermarket part. For a vehicle like the 2012-2019 Explorer, a quality aftermarket cooler is often a smart, budget-friendly choice. The original coolers are not known for being exceptionally robust, and aftermarket brands specialize in cooling technology.
- OEM vs. Aftermarket: An OEM cooler will be a direct replacement, but you'll pay a premium for the Ford logo. A good aftermarket part can meet or even exceed OEM quality for less money. Aftermarket brands often use designs like stacked-plate coolers which can be more efficient and durable than basic tube-and-fin designs.
- Brand Quality: Brands like Derale, Hayden, and Four Seasons are well-known in the aftermarket cooling world. Hayden is often praised for its reliability and value. Derale is known for a wide range of options, including heavy-duty models. All three are generally considered reputable choices for a standard replacement.
Pro Tip: When replacing the cooler, it's a great time to also do a transmission fluid drain and fill. The transmission in these Explorers has a drain plug, making it easier than many other vehicles. Since the internal filter is not easily serviceable, keeping the fluid clean is the best way to extend the life of your transmission.
🎬 Learn why you should drain and refill your fluid early.Estimated Replacement Costs
The cost to replace the transmission cooler can vary based on who does the work. The part itself is not very expensive, but labor can add up.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Cooler | $52 - $96 |
| New OEM Cooler | $130 - $305+ |
| Shop Labor | $175 - $500 |
| Total (DIY) | $52 - $96 |
| Total (Shop) | $227 - $596+ |
Frequently Asked Questions
Can I drive my Explorer with a bad transmission cooler?
If you have a minor leak, you might be able to drive a short distance to a repair shop, but it's risky. If the transmission is overheating or shifting poorly, do not drive. Running a transmission with low or burnt fluid can cause catastrophic failure very quickly.
How difficult is it to replace the transmission cooler myself?
For a DIYer with some experience, it's a manageable job. It involves draining the fluid, accessing the cooler at the front of the vehicle, disconnecting the lines (which may require a special tool), and swapping the unit. The main challenges are dealing with potential corrosion and making sure you properly refill the transmission fluid to the correct level.
What type of transmission fluid does my 2012-2019 Explorer need?
These Explorers use Motorcraft MERCON LV automatic transmission fluid. It's critical to use the correct fluid. Using the wrong type can cause shifting problems and damage the transmission.
Should I get a heavy-duty cooler?
If you frequently tow a trailer or live in a very hot climate, upgrading to a larger or more efficient stacked-plate aftermarket cooler is a good investment. It provides extra protection against overheating. For normal daily driving, a standard replacement cooler from a quality brand is sufficient.
Helpful Videos
Technical Specifications
Fits 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ford Explorer. Compatible with 6F35 and 6F55 6-speed automatic transmissions. Fluid Type: Motorcraft MERCON LV.
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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.
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