Fleece Performance 13-18 RAM 2500/3500 6.7L Cummins Coolant Bypass Kit
SKU: 39634788662

Fleece Performance 13-18 RAM 2500/3500 6.7L Cummins Coolant Bypass Kit

Sale price$175.83 Regular price$195.37
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Ships within 48 hours · Estimated delivery Jul 8 - Jul 13

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Description

Fleece Performance 13-18 RAM 2500/3500 6.7L Cummins Coolant Bypass KitThe Fleece Performance coolant bypass for the 2013 2018 RAM with 6. 7L Cummins seamlessly integrates with your truck for an OE fit and finish. Features Increased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 6. 7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out

The Fleece Performance coolant bypass for the 2013-2018 RAM with 6.7L Cummins seamlessly integrates with your truck for an OE fit-and-finish. Features Increased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. Our coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders. Benefits Lowers coolant temperature at the rear cylinders Ensures consistent temperatures across all cylinders Prevents damaging coolant pressure build up Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation. Why do I need aFleece Coolant Bypass? One of the biggest issues on the 6.7L Cummins is the coolant flow problem to the rear cylinders. This can cause catastrophic failure or blow outs of the freeze plugs in an over-temperature / over-pressure condition. The Fleece Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform. Kit Includes: Rear coolant bypass thermostat housing Front coolant bypass thermostat housing New EGR cross-over tube gaskets Black braided nylon coolant bypass hose with protective high temperature sleeve and AN fittings Mounting hardware

Installation Instructions
Datasheet
Warranty
  • Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation
  • Ensures consistent temperatures across all cylinders
  • Lowers coolant temperature at the rear cylinders
  • Prevents damaging coolant pressure build up

This Part Fits:

Year Make Model Submodel
2013-2018 Ram 2500 Big Horn
2013-2018 Ram 2500 Laramie
2014-2015 Ram 2500 Laramie Limited
2013-2018 Ram 2500 Laramie Longhorn
2016-2018 Ram 2500 Limited
2013-2015 Ram 2500 Lone Star
2013-2016 Ram 2500 Outdoorsman
2013-2018 Ram 2500 SLT
2013 Ram 2500 ST
2013-2018 Ram 2500 Tradesman
2013-2018 Ram 3500 Big Horn
2013-2018 Ram 3500 Laramie
2014-2015 Ram 3500 Laramie Limited
2013-2018 Ram 3500 Laramie Longhorn
2016-2018 Ram 3500 Limited
2013-2015,2017 Ram 3500 Lone Star
2013-2018 Ram 3500 SLT
2013 Ram 3500 ST
2013-2018 Ram 3500 Tradesman
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 39634788662

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4.5 ★★★★★
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A
Verified Purchase
Amazon Customer
Whiting, US
★★★★★ 5
Great fit and quality
Size: AF113
Not a complicated product, but after going to 2 different auto parts stores and this not being in stock, Amazon to the rescue. Arrived the next day and the quality is definitely on par with “store brand” ones from retailers. Definitely cheaper as well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 23, 2026
A
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AC
Lake Worth, US
★★★★★ 5
Fit my 2014 Accord perfectly
Size: AF476
Seems to be the same quality as OEM. Fit perfectly. Easy to install.
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Reviewed in the United States on April 24, 2026
B
Verified Purchase
Becca
Bozeman, US
★★★★★ 4
Affordable priced. Fits well
Size: AF377
They work good in my 2019 Toyota RAV4
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Reviewed in the United States on May 11, 2026
M
Verified Purchase
MarkC
Los Angeles, US
★★★★★ 5
Perfect fit, slid right into place and locked like it should
Size: AF943
Wanting to correct my previous review (I reviewed the incorrect item). This product fit perfectly in my vehicle- my apologies for the first review; perhaps Amazon or the vendor can replace the first review with this one. I am very pleased with this item.
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Reviewed in the United States on May 15, 2026
C
Verified Purchase
Carole R. NAPOLI
Belleville, US
★★★★★ 5
Great filter
Size: AF741
Fit out Toyota Prius V 2014 perfect. Well made too.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026

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