Image coming soonWehrli 1998.5-2018 5.9L & 6.7L Cummins WCFab X Fleece Thermostat Housing
Can I pick up my order or have it installed at your shop?
Can I pick up my order or have it installed at your shop?
Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at 636-429-7020 or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.
How do I know if this part fits my vehicle?
How do I know if this part fits my vehicle?
Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.
What if I need to return a product or it’s defective?
What if I need to return a product or it’s defective?
Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)
What's the lead time on custom or fabricated parts?
What's the lead time on custom or fabricated parts?
Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at 636-429-7020 and we’ll confirm current availability or estimated ship dates.
The factory thermostat housing on a 1998.5-2018 Ram 2500/3500 5.9L and 6.7L Cummins is the last ugly casting in an otherwise dressed-up engine bay. The Wehrli x Fleece Performance Thermostat Housing (Manufacturer Part # WCF100157) is a direct bolt-in replacement, powder coated in your choice of color, with a -8 AN auxiliary port machined in for accessories or custom coolant routing.
Why Choose the Wehrli x Fleece Thermostat Housing?
- Direct OEM replacement – no adapters, no modification, straight swap for the factory housing.
- -8 AN O-ring auxiliary port with plug – capped from the factory, there when you want it. Useful for coolant-fed accessories or a custom routing on a built truck.
- Covers twenty model years on one part number – 1998.5 through 2018, 5.9L and 6.7L alike.
- Matches the rest of the build – same powder coat range as Wehrli's upper coolant pipes, intake kits and valve covers, so the engine bay reads as one piece.
- WCFab and Fleece Performance collaboration – two names diesel owners already know, on one part.
- Made in the USA.
Kit Includes
- Thermostat housing / coolant elbow
- -8 AN auxiliary port plug
Installation Highlights
Direct replacement for the OEM thermostat housing — it goes in where the factory part comes out, no other modifications required.
Fits These Models
1998.5 through 2018 Dodge and Ram 2500 and 3500 with the 5.9L Cummins or 6.7L Cummins.
Specifications
- Auxiliary port: -8 AN O-ring, supplied with plug
- Replacement for OEM part number: 68145495AA
- Finish: custom powder coat, color selected above
- Made in the USA
Key Features at a Glance
- Direct OEM replacement - bolt-in, no modification.
- -8 AN auxiliary port - plugged until you need it.
- 1998.5-2018, 5.9L and 6.7L - one part covers the whole range.
- WCFab x Fleece Performance - joint development.
- Custom powder coat finish - pick your color above.
Notes
- Lead time varies by color. WCFab Red, WCFab Grey, Bronze Chrome, Illusion Purple, Candy Blue, Candy Teal, Gloss Black and Gloss White are stocked and ship in 3-5 business days. All other colors are made to order on a 10-15 business day lead time.
- Pairs with Wehrli's upper coolant pipe for this truck if you are cleaning up the whole cooling side.
FASS SKU: [ADD FASS SKU]
Manufacturer Part #: WCF100157
Questions? We’re Here to Help.
Have questions about upgrades for your 5.9L or 6.7L Cummins? Contact FASS Motorsports and we’ll get you dialed:
Phone: 636-429-7020
Email: info@fassmotorsports.com
This part fits the following vehicles:
| Years | Make & Model |
|---|---|
| 1998 | Dodge Ram 2500 |
| 1998 | Dodge Ram 3500 |
| 2018 | Ram 2500 |
| 2018 | Ram 3500 |
Fitment is listed by year, make and model. Some applications also depend on cab, bed, drivetrain or engine — if you are not sure, call 636-429-7020 or send us your vehicle details and we will confirm before you order.
