Coolant overflow tank leaking, how can I fix it?

2004 FORD FIESTA
200,000 MILES • 1.6L • MANUAL
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LINDOKUHLE NKOSI
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Greetings,

My car was overheating then I realized that the fan was delaying and running for a small amount of time, then I managed to get a mechanic to install it to run together with the ignition. I have a problem, the coolant overflow tank it is leaking. The old one I was using started having cracks and leaking, then I bought a new one. It's about two weeks old now but has already got cracks and it's leaking as well. What could be causing the cracks and leaking of the coolant overflow tanks?

When I turn on the heater a bad smell comes out. What could also be the cause of the problem?
How can I fix it and how can I stop the leak?
Jul 17, 2022 at 12:42 AM
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STEVE W.
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From the description I would suspect you are getting combustion gases in the cooling system and the pressure is causing stress in the expansion tank. That could be the result of overheating in the beginning. Even a slight head gasket leak could cause both issues.
I would start by testing for a bad head gasket first, these guides may help with that:

https://www.2carpros.com/articles/head-gasket-blown-test
https://www.2carpros.com/articles/radiator-pressure-test

Jul 17, 2022 at 9:12 AM