Hello,
My 2004 Fiesta had hard time to keep operating temperature. Especially during winter time, it would rarely go into the middle of the gauge, it would stay at the second marking on the dial. 
So I replaced the thermostat, it was leaking a bit anyways. Colorstat was the only brand I could find. 
It fixed the problem at first, even in the middle of the winter, car would work at optimal temp. but after a year and 30k KM later, I'm having the exact same problem. Also it leaks a bit again.

Probably that stupid plastic housing get temperature stress bends and starts leaking. So is there a metal one? If not, is there a reliable brand which will last more than a year?
I can't find original Ford one here. Should I get a Gates maybe?

just did this today and bought a new gasket, from ford i think they have a superseded part now its thicker and not blue but black  

On 11/30/2024 at 8:58 PM, festervas said:

just did this today and bought a new gasket, from ford i think they have a superseded part now its thicker and not blue but black  

Can't find Ford originals in my local shops. Is this Gates looks like the upgraded one? Fount it on interwebs.

 

2 hours ago, therasko said:

Can't find Ford originals in my local shops. Is this Gates looks like the upgraded one? Fount it on interwebs.

 

i only changed the gasket as mine still opened ... i tested it with boiling water. but your old one seems to have a new seal as fords oem one from new was blue 

I found these photos online, they are not mine. But I will give the Gates a try, read good reviews for it, thanks.