The Duratec 2.5 liter engine is used in a range of vehicles by Mazda and Ford – Mazda 3, Mazda 5, Mazda 6, Mazda CX-7, Mazda Tribute, Ford Escape, Ford Focus, Ford Fusion, Ford Transit Connect, and possibly others.
They all suffer a common flaw of a plastic (fiber reinforced nylon aramid) coolant outlet bolted to the aluminum cylinder head and sealed with a rubber o-ring. The o-ring and housing both degrade due to heat from the engine and this results in a coolant leak.
This is a potentially fatal flaw as sudden failure of the housing gasket can lead to rapid loss of coolant and overheating of the engine.
The vehicle in this video is a Mazda 5. We use a coolant system pressure system to identify the source of the leak. We show the defective part with a brief DIY tips and tricks for removing and replacing the coolant outlet housing.
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I've had this same leak for about a year. Not too bad, but gets worse when using the AC. I would just add more antifreeze every few days. I was afraid the leak would be in a difficult, hard to access place. So I kept ignoring it. Now I'm going to fix it. Thanks!
would it be okay to just change the gasket vs the whole assembly?
thank you dude 😉
I have Mazda 5, I would like to know the name of this part or the part number. It seems I have the same issue and all coolant leaked out.
Thank you sir ,it feels good to DIY (Do It Yourself) after watching your simple direction's
I am having a similar problem on my 2015 CX5 2.2 diesel. Very very small drip of coolant on the floor just under the radiator. BUT the water in the radiator isnt going down. Checked the expansion tank no leaks!!
Could it be the same issue, please? Thanks in advance.
The car is a Mazda THREE!!
Thank you for your video. It appears this is the issue I'm having with my wife's car. I will have to investigate, but this gives me a good place to start.