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Honda K Series Thermostat Housing


Genuine Honda thermostat housing for 2007-2012 Acura RDX. 

Do you hate the plastic OEM housings found on all k series engines? Maybe you've had a cracked housing... or worse! A stripped M6 insert that kept you from being able to take your thermostat cover off. 

The K23's RDX housing fits all k series engines... but it does unfortunately change the thermostat cover bolt pattern. I refer to this as "all others" so it will not work with the OEM K20A, K20A2, K20Z1 (or any other application that shares those part numbers) cover that fits those engines. If you already own my billet cover and you want to make it work with this... you will have to modify the cover yourself to look like the "all others mod". If you are about to buy my billet cover, make sure you ask for that option.

There is unfortunately one thing that does not work out of the box and it will require you to do one of a few different things before you install it. The tall metal tube coming out of the housing is you new water bypass connection and it is not only tall, but it is also 3mm bigger! The plastic housing measures 17mm and this one measures 20mm and if you think you can stretch the hose 3mm... be my guest. If not, you will either need to buy a reducer joint, cut and weld a new tip on the tube, or pull the tube and either weld a new nipple or tap the hole for a threaded fitting.

NOTE: I stock these in limited quantity so if I run out and can/ will delay your order from shipping. The hardware kit includes three Genuine Honda M6 bolts and the matching gasket.