FM radiator cap
FM radiator cap
Exclusive to Flyin' Miata!
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Description
There are a lot of radiator caps out there, so how do you know you're getting a good one? Same answer here as elsewhere - buy it from FM. These are made with a silicone seal for long life and an anodized finish with a laser-engraved logo. Plus, they're much more economical than other options out there.
Available in 16 psi or 20 psi versions. Most cars running at least 30% antifreeze will want the 16 psi version. If you're running more water you'll want the 20 psi version - 100% water boils at a lower temp than water + antifreeze, raising the pressure of the system brings the boiling point back up. Bear in mind that more pressure = greater likelihood of leaks. If your system is healthy it'll be fine with 20 psi, if it's questionable the higher pressure cap might push the system too far and cause a leak.
Instructions
Instructions are not currently available.
Shipping
$9.99 flat rate shipping. Orders over $40 ship for free in the US!
Details
Shipping restrictions: None
What does it fit?
Fits: 1990-1997, 1999-2005, 2004-2005 MSM, 2006-2015, 2007-2015 PRHT, 2016-2025, 2017-2025 RF
Emissions
Emissions do not apply.
Warranty
none
SKU
It really took some force to get the cap to make the last fifth of a turn so that the little ears on the cap were in line with the hose to the overflow tank on my Koyorad aluminum radiator. Neither the stock cap nor my temporary Dormant replacement cap had that issue. Otherwise the cap is pretty nice!
Not much more to ask for - it looks nice, the logo is correctly oriented when the cap is on, and it fixed my issue with coolant blowing out the overflow tank when the car shut off.
I ordered this because I needed to replace the radiator on my 2001 SE. I picked an OEM type replacement but with the new radiator, the original cap looked old and worn. I didn’t want some expensive high pressure cap, just a nice, reliable upgrade over the stock item. It’s perfect and looks really nice
Nice quality piece looks much better than stock
Sleek, does what it’s supposed to for my application (more antifreeze than water so 16psi)