A leaking transmission cooler on the 6.7L Cummins mixes coolant and fluid. Replace it before it ruins the transmission.
cooling
🚗 Dodge Ram 2500
Moderate
How to Fix Dodge Ram 2500 Transmission Cooler Leak
Red Rocket
·
August 7, 2026
·
⏱ 2-3 hours
·
2010-2019 Dodge Ram 2500
0
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Step-by-Step Instructions
-
1
Diagnose the leak at the cooler.
-
2
Drain coolant.
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3
Remove the old cooler.
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4
Install the new cooler.
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5
Refill coolant and transmission fluid.
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6
Test for leaks.
Tools & Parts Needed
- 🔧 New transmission cooler, Coolant, Socket set
Frequently Asked Questions
How long does this fix take?
2-3 hours
Do I need special tools?
Yes — see the Tools & Parts list above.
Is this covered under warranty?
Check your vehicle warranty. Some repairs may be covered, especially if the issue is a known defect.
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