# Fleece Performance 2019+ Ram 2500/3500 Cummins 6.7L Coolant Bypass Kit

All new Fleece Performance coolant bypass for the 2019+ RAM with 6.7L Cummins! Our patent pending design seamlessly integrates with your truck for an OE fit-and-finish. 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.

-   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

2019-2022

Ram

2500

Big Horn

2019-2022

Ram

2500

Laramie

2019-2021

Ram

2500

Laramie Longhorn

2019-2022

Ram

2500

Limited

2021-2022

Ram

2500

Limited Longhorn

2019-2022

Ram

2500

Lone Star

2019-2022

Ram

2500

Tradesman

2019-2022

Ram

3500

Big Horn

2019-2022

Ram

3500

Laramie

2019-2020

Ram

3500

Laramie Longhorn

2019-2022

Ram

3500

Limited

2021-2022

Ram

3500

Limited Longhorn

2019-2022

Ram

3500

Lone Star

2019-2022

Ram

3500

SLT

2019-2022

Ram

3500

Tradesman

## Details

- **Price:** 547.12 CAD
- **Vendor:** Fleece Performance
- **Type:** Coolant Bypass Kits

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 547.12 CAD | In stock |

## Images

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/fleece-performance-2019-ram-2500-3500-cummins-6-7l-coolant-bypass-kit)
> Updated: 2026-06-27