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Detroit DD15/DD16 EGR Cooler — Replacement Guide & OE Cross Reference
Complete resource for Detroit Diesel DD15 and DD16 EGR cooler replacement. Covers OE numbers, cross references, failure symptoms, and aftermarket replacement options for Freightliner Cascadia and Western Star trucks.
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Products Available
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OE Numbers
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Vehicle Applications
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FAQs Answered
OE Numbers & Cross References
SUMEC Replacement Products
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Common Failure Symptoms
- 1Coolant loss requiring frequent top-off
- 2White smoke from exhaust stack
- 3DTC codes: SPN 3936 FMI 0/1 (EGR cooler efficiency)
- 4EGR valve sticking or carbon fouling
- 5Elevated coolant temperature under load
- 6Coolant in intake manifold or charge air system
- 7Oil cooler contamination (coolant mixing with oil)
Vehicle Fitment
| Vehicle / Engine Application |
|---|
| Freightliner Cascadia DD15 14.8L (2014-2024) |
| Freightliner Cascadia DD16 15.6L (2014-2024) |
| Western Star 5700XE DD15 (2016-2024) |
| Western Star 4900 DD15/DD16 (2014-2024) |
| Thomas Built Buses DD15 (2017-2024) |
Related Technical Articles
Frequently Asked Questions
Typical lifespan is 300,000-500,000 miles depending on duty cycle, maintenance, and coolant condition. Heavy-haul and mountain operations may see shorter life due to higher thermal stress. Regular coolant analysis can detect early signs of internal leakage.
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