Compatible (1.6L)

2014 – 2019 Ford Fiesta ST

This tank will not fit vehicles that have been serviced under recall #17V209000After a few hot and cold cycles, Mishimoto recommends checking the sight glass on the side of the expansion tank to confirm proper coolant level.

Add some additional reliability and engine bay styling with the Mishimoto Fiesta expansion tank. The Mishimoto Fiesta ST expansion tank has internal baffles to prevent coolant starvation from overflow ports to engine. Also, during high-speed cornering, braking, and acceleration, the internal baffles reduce coolant sloshing. The engineers at Mishimoto have also included a sight glass to allow for proper hot and cold coolant levels. The stock coolant Fiesta expansion tank is a major eyesore in the engine bay, so the Mishimoto tank is offered in polished or black powder coat to keep your Fiesta ST looking great. As an added feature, you can install your tank in under one hour!

This Fiesta expansion tank was designed to work with the stock expansion tank cap and includes an overflow nipple on the fill neck for adding an additional coolant tank so your Fiesta ST is NHRA legal. Plastic expansion tanks are prone to failure after years of constant temperature variations, so the Mishimoto tank is constructed from durable, TIG-welded aluminum for optimal durability and longevity. The Mishimoto Fiesta expansion tank is engineered for perfect fitment in the 20142019 Fiesta ST, and as with all our Fiesta ST parts, this expansion tank includes the Mishimoto Lifetime Warranty.

• Direct fit for the 20142019 Ford Fiesta ST
• Installs in under one hour
• Sight tube allows for proper hot and cold coolant levels
• Internal baffle keeps coolant near overflow port during aggressive driving, preventing air entry into coolant system
• 100% aluminum, fully-welded construction for maximum durability during repeated temperature transitions
• Overflow nipple on fill neck allows for installation of additional NHRA-mandated overflow reservoir
• Fits with stock overflow tank cap
• Available in polished or black powdercoated finish
• Mishimoto Lifetime Warranty

VEHICLE SPECS

PRODUCT SPECS

PURCHASE INCLUDES

(1) Aluminum Expansion Tank w/ Sight Glass
(1) Overflow Hose
(2) Rubber sleeves
Mishimoto Lifetime Warranty

SAY NO TO PLASTIC COOLANT EXPANSION TANK R&D, PART 1: INITIAL DESIGN

Time to dive into yet another Fiesta ST project! This little Fiesta is getting the royal treatment at Mishimoto; over the last few months it has been fitted for numerous upgrades. If you are in the mood for a recap, you can check out some of the other Fiesta posts here on the Mishimoto blog. For now well dive right into ourdevelopment of Mishimotos expansion tank for the Fiesta ST.

Stock Expansion Tank

Here at Mishimoto we feel a certain type of way about plastic. It is not that we have a vendetta against plastic, but we see an area where we can improve upon some of the stock Fiesta ST parts. Plastic expansion tanks in general (or any plastic parts) are more prone to failure than an aluminum part would be. Plastic becomes brittle with age, exposure to elements, and the repeated heat cycles in the engine bay. Replacing the plastic tank with an aluminum one not only looks better, but it also would be less prone to bursting or cracking especially as the Fiesta ages. Check out a coupleshots of the stock Fiesta ST expansion tank.

Stock Fiesta expansion tank in engine bay

The stock expansion tank is your run of the mill plastic expansion tank. There are no impressive additions from the factory that we would be required to recreate (asseen on some of our other expansion tank projects). Ford did, however, have an interesting design for the inside of the tank. Lets take a closer look atthe inside of the stock Fiesta ST expansion tank.

Stock Fiesta expansion tankStock Fiesta expansion tankInternals of stock Fiesta expansion tankInternals of stock Fiesta expansion tankInternals of stock Fiesta expansion tankInternals of stock Fiesta expansion tank

Its not all bad! The inside design is intricate,featuring many compartments and grooves to prevent sloshing. We will certainly incorporate this style into our designbecause we want improvedfunction in addition to form.

3D-Printed Version

After a thorough look inside and out, we took some measurements of the stock unit so we couldcreate a prototype version with our 3D printer. The prototype fit nicely into the space forthe stock expansion tank and there were no clearance issues withother Fiesta ST parts in the engine bay. Check out some shots of the 3D-printed version below!

3D printed expansion tank in relation to other Fiesta ST parts3D printed Fiesta expansion tank installed on the ST3D printed Fiesta expansion tank installed on the ST3D printed Fiesta expansion tank installed on the ST3D printed Fiesta expansion tank installed on the ST

Coming Up!

Now that we have confirmed fitment with our 3D-printed expansion tank for the Fiesta ST, we can move on to create an aluminum version for additional testing. Stay tuned for more on this and other Fiesta ST parts in our next post!

SAY NO TO PLASTIC COOLANT EXPANSION TANK, POST 2: FINAL PROTOTYPE

It has been a while since we took a look at what is going on in the world of the Fiesta expansion tank. In our last post we test fitted our 3D-printed prototype on the Fiesta ST. After fitment was confirmed, we played the waiting game for our final prototypes arrival at our development facility. Our best efforts at being patient paid off when we had two packages arrive this morning!