78F350 has given you good advice.
You say you pressurized the system and heard air hissing out but could not find the leak.
Use a bottle of water with dish soap in it.
Pressurize the system and then start squirting the soapy water on everything you suspect could be the leak.
The soapy water will bubble up.
You need to isolate and identify the cause of your coolant leak.
Or you could end up chasing your tail, spending a lot money and changing parts that don't need changed.
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