PRODUCT DETAILS
SpeedFactory -16AN Cast Thermostat Housing - Honda B-Series & D-Series
We've all seen the alternative, and some of us have built it. A 30-year-old thermostat housing, corroded green, with a -16AN bung hacked into it and welded on by somebody's cousin. It sort of seals. It looks rough. And every time you crack the hood you wonder if today's the day that weld lets go. This SpeedFactory housing kills that whole approach. It's a purpose-cast -16AN thermostat housing that bolts on where your factory one came off, so you can plumb your cooling system properly instead of butchering a used part and hoping.
Cast For The Job, Not Cut Up For It
The difference between this and a modified factory housing is everything. This one's cast with the -16AN fitting as part of the design, so the transition is smooth, the sealing surface is machined right, and there's no heat-affected weld sitting in a spot that sees constant thermal cycling. If you've ever had a hacked housing weep coolant from a weld you couldn't quite get to, you know exactly why that matters. Your -16AN hoses and fittings thread straight in, clean, first time, and the whole front of your engine looks like you meant to do it.
The Fan Switch And Ground Wire Are Still There
This is the detail that separates a well-designed part from a pretty one, and it's the thing that catches people out on custom housings. SpeedFactory kept provisions for both the OEM cooling fan switch and the engine harness ground wire. That fan switch is what actually turns your fan on, so lose the provision and now you're rigging up a workaround or watching your temp gauge climb in traffic. And that ground wire isn't decorative either, the engine harness grounds through there, and if it's got nowhere to land you'll be chasing electrical gremlins that make no sense until somebody finally traces it back to a missing ground. Both bolt right up here, so your car works the way it's supposed to.
Finish The Job With A Fill Neck
If you're converting to -16AN, do the whole system. Pair this with SpeedFactory's Upper Coolant Fill Neck and you get a proper high point to fill and bleed from, which is the difference between a system that burps in ten minutes and one that has you chasing air pockets all afternoon. The housing and the fill neck are designed to work together, so run them together.
Heads-Up: -16AN Is Big
Plan for this before you order. -16AN hose ends are physically large, and once they're on the car they take up real estate you might currently be using for something else. Depending on your setup, you may need to make clearance adjustments around your fill neck, your scattershield, or whatever else lives in that corner of the bay. It's nothing dramatic, but mock it up before you commit, especially in a tight tucked bay. Know it going in and it's a non-issue.
What You Get
- SpeedFactory -16AN cast thermostat housing for B-series and D-series engines
- Direct replacement for the factory thermostat housing
- Cast -16AN fitting, no cutting or welding required
- Retains the OEM cooling fan switch provision
- Retains the engine harness ground wire provision
- Pairs with the SpeedFactory Upper Coolant Fill Neck
Fits These Cars
- 1990-2001 Acura Integra GS/LS/RS
- 1992-1993 Acura Integra GS-R
- 1994-2001 Acura Integra GS-R
- 1997-2001 Acura Integra Type R
- 1992-2000 Honda Civic CX/DX/EX/LX/VX/Si
- 1999-2000 Honda Civic Si
- 1993-1997 Honda Del Sol S/Si/VTEC
Note: -16AN hose ends are large and may require clearance adjustments to other components such as fill necks or scattershields. Thermostat not included. One housing per order.