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I have been a professional master mechanic for over 35 years and am happy to help you with this.
If you want to try and find the leak yourself all you have to do is stop by any parts store and they will loan you whats called a coolant pressure tester.
You simply remove the radiator cap and pit the pressure tester in its place and pump it up to bulid pressure and any leak will show for you.
I can send you a pic of the pressure tester if you like.
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