Hi,
When you try starting it, does the starter engage, turn the engine, but the engine does not start? If so, we need to see if the engine lost spark or fuel. Take a look through this link first:
https://www.2carpros.com/articles/car-cranks-but-wont-start
The easiest way to determine if there is spark and fuel is to see if it starts using starting fluid. If it does and then stalls, we know it's likely a fuel-related issue. If it makes no difference, it's likely ignition-related.
Also, we should pressure test the cooling system just to make sure it can hold pressure or we have a leak somewhere, either internal or external.
https://www.2carpros.com/articles/radiator-pressure-test
If possible, record it cranking and upload it for me to hear. That may help.
Take care and let me know what you find.
Joe
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Monday, September 6th, 2021 AT 7:34 PM